EXHIBIT 4.1
                          SECURITIES PURCHASE AGREEMENT

     THIS SECURITIES  PURCHASE AGREEMENT (the "Agreement") is entered into as of
July  1,  2004,  by  and  between  MIRAVANT  MEDICAL  TECHNOLOGIES,  a  Delaware
corporation  (the  "Company"),  with  headquarters  located at 336 Bollay Drive,
Santa Barbara,  California 93117, and ADVANCED  CARDIOVASCULAR  SYSTEMS, INC., a
wholly  owned  subsidiary  of Guidant  Corporation  ("ACS")  with  regard to the
following:

                                    RECITALS

     A. ACS desires to purchase,  upon the terms and  conditions  stated in this
Agreement,  shares of the Company's Series A-1 Convertible  Preferred Stock, par
value $.01 per share  ("Series A-1  Preferred  Stock"),  Series A-2  Convertible
Preferred  Stock, par value $.01 per share ("Series A-2 Preferred  Stock"),  and
Series A-3 Convertible  Preferred  Stock,  par value $.01 per share ("Series A-3
Preferred Stock" and collectively with the Series A-1 Preferred Stock and Series
A-2 Preferred  Stock referred to as the "Preferred  Stock") as herein  provided.
The rights, preferences, privileges and restrictions of the Series A-1 Preferred
Stock,  Series A-2 Preferred  Stock and Series A-3 Preferred Stock are set forth
in the  Certificates  of  Designation  attached  hereto as  Exhibits A, B and C,
respectively.  The Preferred  Stock, and the common shares to be issued upon the
conversion of the Preferred Stock,  are  collectively  referred to herein as the
"Securities."

     B. The Company and ACS are  executing  and  delivering  this  Agreement  in
reliance  upon  the  exemption  from  securities  registration  afforded  by the
provisions of Regulation D ("Regulation D"), as promulgated by the United States
Securities and Exchange Commission (the "SEC") under the Securities Act of 1933,
as amended (the "Securities Act").

     C. Contemporaneously with the execution and delivery of this Agreement, the
parties hereto are executing and delivering a (1) Registration  Rights Agreement
in the form attached hereto as Exhibit D (the "Registration  Rights Agreement"),
pursuant to which the Company has agreed to provide certain  registration rights
under the Securities Act, the rules and regulations  promulgated  thereunder and
applicable  state  securities laws and (2)  Collaboration  Agreement in the form
attached  hereto  as  Exhibit  E  concerning  a   collaboration   regarding  the
development of the Company's technology for cardiovascular  applications for the
treatment of cardiovascular diseases (the "Collaboration Agreement").

                                   AGREEMENTS

     NOW,  THEREFORE,  in consideration of their respective  promises  contained
herein and other good and valuable consideration, the receipt and sufficiency of
which are hereby acknowledged, the Company and ACS hereby agree as follows:

                                    ARTICLE I

                      PURCHASE AND SALE OF PREFERRED STOCK

     1.1 Purchase of Preferred  Stock.  Subject to the terms and  conditions  of
this  Agreement,  the closing of the issuance,  sale and purchase of each of (a)
the Series A-1 Preferred  Stock,  (b) Series A-2 Preferred  Stock and (c) Series
A-3 Preferred Stock shall be consummated in a closing (each a "Closing") at 9:00
a.m., on a date to be specified by the parties, which shall be no later than the
second business day after satisfaction or waiver (to the extent waivable) of all
conditions to the consummation of the respective Closing set forth in Article VI
(other than those  conditions  that by their  nature are to be  satisfied at the
respective  Closing,  but  subject  to  the  satisfaction  or  waiver  of  those
conditions),  at the  offices of Sheppard  Mullin  Richter & Hampton,  LLP,  800
Anacapa Street,  Santa Barbara, CA 93101, unless another time, date, or place is
agreed to by the parties.  The date on which each Closing  occurs is referred to
as a "Closing Date." All actions taken at a Closing shall be deemed to have been
taken  simultaneously  at the  time the  last of any  such  actions  is taken or
completed.

     1.2 Initial Investment.

     (a) Upon the  execution  of this  Agreement  and  subject  to the terms and
conditions of this  Agreement,  the Company shall issue and sell to ACS, and ACS
shall purchase from the Company  1,112,966  shares of Series A-1 Preferred Stock
at a  purchase  price of $2.70 per share,  for an  aggregate  purchase  price of
$3,000,000 (the "Initial Investment").

     (b) At the  Closing  of the  Initial  Investment,  subject to the terms and
conditions hereof,

                           (i) the Company shall deliver to ACS a certificate
         representing the number of shares of Series A-1 Preferred Stock to be
         purchased by ACS, the documents required to be delivered by the Company
         pursuant to Section 6.3 hereof, and executed signature pages to the
         Registration Rights Agreement and the Collaboration Agreement; and

                           (ii) ACS shall pay to the Company in cash, by wire
         transfer of immediately available funds to an account designated by the
         Company, the purchase price of the Initial Investment, and executed
         signature pages to the Registration Rights Agreement and the
         Collaboration Agreement.

     1.3 Interim Investment.

     (a) Subject to the terms and conditions hereof,  within thirty (30) days of
the  satisfaction  of the conditions in Sections  6.4(a) and 6.4(b) hereof,  ACS
shall  purchase that number of shares of Series A-2 Preferred  Stock at the Fair
Market  Value of the Series A-2  Preferred  Stock that  equals  $2,000,000  (the
"Interim Investment"). The "Fair Market Value" of the Series A-2 Preferred Stock
equals the average  price at which the common  stock of the Company (the "Common
Stock") is being publicly traded on the OTC Bulletin Board securities market (or
such other national  securities  exchange or automated quotation system that the
Common Stock may be publicly traded) for the ten (10) trading days ending on the
day immediately before the Closing Date of the Interim Investment.

     (b) At the  Closing  of the  Interim  Investment,  subject to the terms and
conditions hereof,

                           (i) the Company shall deliver to ACS a certificate
         representing the number of shares of Series A-2 Preferred Stock to be
         purchased by ACS and the documents required to be delivered by the
         Company pursuant to Section 6.4 hereof; and

                           (ii) ACS shall pay to the Company in cash, by wire
         transfer of immediately available funds to an account designated by the
         Company, and the purchase price of the Interim Investment.

     1.4 Final Investment.

     (a) Subject to the terms and conditions hereof, on a date designated by ACS
that is within four (4) months of the satisfaction of the conditions in Sections
6.5(a) and (b) hereof,  ACS shall  purchase  that number of shares of Series A-3
Preferred  Stock at the Fair Market Value of the Series A-3 Preferred Stock that
equals the aggregate  amount of $2,000,000 (the "Final  Investment").  The "Fair
Market  Value of the Series A-3  Preferred  Stock"  equals the average  price at
which  the  Common  Stock is being  publicly  traded on the OTC  Bulletin  Board
securities  market for the ten (10) trading  days ending on the day  immediately
before the Closing Date of the Final Investment.

     (b) At the  Closing  of the  Final  Investment,  subject  to the  terms and
conditions hereof,

                           (i) the Company shall deliver to ACS a certificate
         representing the number of shares of Series A-3 Preferred Stock to be
         purchased by ACS and the documents required to be delivered by the
         Company pursuant to Section 6.5 hereof; and

                           (ii) ACS shall pay to the Company in cash, by wire
         transfer of immediately available funds to an account designated by the
         Company, the purchase price of the Final Investment.

     1.5 Limitation on Investment.

     (a) Notwithstanding  anything in this Agreement to the contrary,  ACS shall
have no obligation to make any purchase  (including  the Interim  Investment and
Final  Investment)  if such purchase would cause it to own 20% or more of either
(i)  the   then-outstanding   share   capital   of  the   Company  or  (ii)  the
then-outstanding  share capital of the Company on a  fully-diluted  as-converted
basis, in which case it shall only be required to purchase the maximum number of
shares of the Company in either the Interim  Investment or Final Investment that
it could purchase without its ownership equaling or exceeding 20%.

     (b) The  Company  shall  have no  obligation  to sell any shares of capital
stock to the extent such sale violates any  applicable  law, rule or regulation,
including but not limited to the listing requirements or other regulation of any
national securities exchange.  In the event that the Company exercises its right
not to sell  additional  shares  to ACS  because  such  sale  would  violate  an
applicable law, rule or regulation,  the Company will discuss this decision with
ACS and, upon ACS's  request,  the parties agree to discuss and negotiate  other
possible  arrangements  in an  effort  to  achieve  the  parties'  intention  of
providing  funding  for  the  transactions  contemplated  by  the  Collaboration
Agreement.

                                   ARTICLE II

                   PURCHASER'S REPRESENTATIONS AND WARRANTIES

     ACS makes no other  representations and warranties,  express or implied, to
the Company in connection with the transactions  contemplated hereby, except for
the following:

     2.1 Investment Purpose. ACS is purchasing the Preferred Stock for ACS's own
account for investment only and not with a view toward or in connection with the
public sale or  distribution  thereof.  ACS shall not,  directly or  indirectly,
offer,  sell,  pledge or  otherwise  transfer  its  Securities,  or any interest
therein,  except pursuant to transactions  that are exempt from the registration
requirements of the Securities Act and/or sales  registered under the Securities
Act. ACS  understands  that ACS must bear the economic  risk of this  investment
indefinitely,  unless the Securities  are registered  pursuant to the Securities
Act  and  any  applicable  state  securities  laws  or an  exemption  from  such
registration  is  available,  and that the Company has no present  intention  of
registering any such Securities  other than as contemplated by the  Registration
Rights Agreement.

     2.2 Accredited  Investor  Status.  ACS is an "accredited  investor" as that
term is defined in Rule 501 (a) of Regulation D.

     2.3 Reliance on Exemptions.  ACS understands  that the Securities are being
offered  and  sold  to  ACS  in  reliance  upon  specific  exemptions  from  the
registration requirements of United States federal and state securities laws and
that the Company is relying upon the truth and accuracy of, and ACS's compliance
with,  the   representations,   warranties,   agreements,   acknowledgments  and
understandings of ACS set forth herein in order to determine the availability of
such exemptions and the eligibility of ACS to acquire the Securities.

     2.4  Information.  The Company,  or its counsel,  have made  available  all
reasonable  materials  relating to the business,  finances and operations of the
Company and  materials  relating to the offer and sale of the  Securities  which
have been specifically  requested by ACS,  including,  without  limitation,  the
Company's  Annual Report on Form 10-K for the year ended  December 31, 2003, and
all  other  reports,  registration  statements,  and  other  filings  (including
amendments to previously filed documents) filed by the Company with the SEC from
December  31,  2002 to the  date of this  Agreement  (all  such  reports,  proxy
statements,  registration  statements,  and filings are collectively  called the
"SEC  Reports" and each is  individually  called a "SEC  Report").  ACS has been
afforded the  opportunity  to ask  questions of the Company and was permitted to
meet with the  Company's  officers  and has  received  what ACS  believes  to be
satisfactory answers to any such questions. Neither such inquiries nor any other
due  diligence  investigation  conducted by ACS, or any of its  representations,
shall   modify,   amend  or  affect  ACS's  right  to  rely  on  the   Company's
representations and warranties  contained in Article III hereof. ACS understands
that  ACS's  investment  in the  Securities  involves  a high  degree  of  risk,
including,  without limitation, the risks and uncertainties disclosed in the SEC
Reports.

     2.5 Governmental  Review.  ACS understands that no United States federal or
state agency or any other  government or governmental  agency has passed upon or
made any recommendation or endorsement of the Securities.

     2.6 Transfer or Resale.  ACS understands that (a) except as provided in the
Registration  Rights  Agreement,  the Securities have not been and are not being
registered  under the Securities Act, or any state  securities laws, and may not
be  offered,  sold,  pledged  or  otherwise  transferred,   unless  subsequently
registered thereunder or an exemption from such registration is available (which
exemption the Company  expressly  agrees may be established as  contemplated  in
clauses (b) and (c) of Section 5.1 hereof); (b) any sale of such Securities made
in reliance on Rule 144 under the  Securities  Act (or a successor  rule) ("Rule
144") may be made only in accordance with the terms of Rule 144 and further,  if
Rule 144 is not applicable,  any resale of such Securities without  registration
under the Securities Act under  circumstances  in which the seller may be deemed
to be an underwriter (as that term is defined in the Securities Act) may require
compliance  with some other  exemption under the Securities Act or the rules and
regulations  of the SEC  thereunder in order for such resale to be allowed,  (c)
the  Company  is under no  obligation  to  register  such  Securities  under the
Securities  Act or any state  securities  laws or to  comply  with the terms and
conditions of any  exemption  thereunder  (in each case,  other than pursuant to
this Agreement and the  Registration  Rights  Agreement) and (d) the Company has
agreed to register the Common Stock issued or issuable  upon the  conversion  of
Preferred Stock as provided in the Registration Rights Agreement.

     2.7 Legends.  ACS understands that, subject to Article V hereof, until such
time as the Common Stock  underlying the conversion of Preferred  Stock has been
registered under the Securities Act as contemplated by the  Registration  Rights
Agreement,  or otherwise may be sold by ACS pursuant to Rule 144 (subject to and
in  accordance  with  the  procedures   specified  in  Article  V  hereof),  the
certificates for the Securities  shall bear a restrictive  legend (the "Legend")
in the following form:

         THE SECURITIES REPRESENTED BY THIS CERTIFICATE HAVE NOT BEEN REGISTERED
         UNDER THE SECURITIES ACT OF 1933, AS AMENDED, OR THE SECURITIES LAWS OF
         ANY STATE OF THE UNITED STATES. THE SECURITIES REPRESENTED HEREBY MAY
         NOT BE OFFERED OR SOLD OR OTHERWISE TRANSFERRED IN THE ABSENCE OF AN
         EFFECTIVE REGISTRATION STATEMENT FOR THE SECURITIES UNDER APPLICABLE
         SECURITIES LAWS OR UNLESS OFFERED, SOLD OR TRANSFERRED PURSUANT TO AN
         AVAILABLE EXEMPTION FROM THE REGISTRATION REQUIREMENTS OF THOSE LAWS.

     2.8 Authorization:  Enforcement. This Agreement and the Registration Rights
Agreement  have been duly and validly  authorized,  executed  and  delivered  on
behalf of ACS,  and are valid  and  binding  agreements  of ACS  enforceable  in
accordance  with their  respective  terms,  except  (i) to the extent  that such
validity or  enforceability  may be subject to or  affected  by any  bankruptcy,
insolvency, reorganization, moratorium, liquidation or similar laws relating to,
or affecting  generally the  enforcement  of,  creditors'  rights or remedies of
creditors generally, or by other equitable principles of general application and
(ii) as rights to  indemnity  and  contribution  under the  Registration  Rights
Agreement may be limited by federal or state securities laws.

     2.9 Residency.  ACS is a resident of the jurisdiction set forth under ACS's
name on the signature page hereto executed by ACS.

                                   ARTICLE III

                  REPRESENTATIONS AND WARRANTIES OF THE COMPANY

     The Company represents and warrants to ACS, as of the date hereof and as of
each Closing, that:

     3.1   Organization  and   Qualification.   Each  of  the  Company  and  its
subsidiaries is a corporation duly organized and existing in good standing under
the laws of the jurisdiction in which it is incorporated,  and has the requisite
corporate  power to own its properties and to carry on its business as now being
conducted.  The  Company and each of its  subsidiaries  is duly  qualified  as a
foreign corporation to do business and is in good standing in every jurisdiction
where the  failure so to qualify  or be in good  standing  would have a Material
Adverse Effect.  "Material Adverse Effect" means any effect which,  individually
or in the aggregate with all other effects,  reasonably  would be expected to be
materially  adverse to (a) the ability of the Company to perform its obligations
under this Agreement,  the  Registration  Rights  Agreement,  the  Collaboration
Agreement  or any  other  agreement  between  the  Company  and  ACS or (b)  the
business,  operations,  properties,  financial condition or operating results of
the Company and its subsidiaries, taken as a whole on a consolidated basis or on
the transactions  contemplated hereby; provided,  however, that clause (b) shall
not  include  any  change,  circumstance  or effect  resulting  from (A) general
changes in the industries in which the Company and its subsidiaries  operate, as
the case may be, except those changes,  circumstances  or effects that adversely
affect the Company and its subsidiaries to a materially greater extent than they
affect other entities  operating in such  industries,  or (B) changes in general
economic conditions or changes in securities markets in general.

     3.2 Authorization; Enforcement. (a) The Company has the requisite corporate
power and authority to enter into and perform this Agreement,  the  Registration
Rights Agreement, and the Collaboration Agreement and to issue, sell and perform
its obligations with respect to the Preferred Stock in accordance with the terms
hereof and  thereof and the terms of the  Preferred  Stock;  (b) the  execution,
delivery and performance of this Agreement,  the  Registration  Rights Agreement
and the Collaboration Agreement by the Company and the consummation by it of the
transactions contemplated hereby and thereby (including, without limitation, the
issuance of the  Preferred  Stock) have been duly  authorized  by all  necessary
corporate  action and no further consent or  authorization  of the Company,  its
board of directors,  or its stockholders or any other person,  body or agency is
required with respect to any of the transactions contemplated hereby or thereby;
(c)  this  Agreement,  the  Registration  Rights  Agreement,  the  Collaboration
Agreement and the certificates for the Preferred Stock have been (or in the case
of the  certificates for the Series A-2 Preferred Stock and Series A-3 Preferred
Stock,  shall be at the time of delivery)  duly  executed  and  delivered by the
Company;  and  (d)  this  Agreement,  the  Registration  Rights  Agreement,  the
Collaboration  Agreement and the Preferred  Stock  constitute (or in the case of
the  certificates  for the Series A-2  Preferred  Stock and Series A-3 Preferred
Stock,  shall  constitute  at the time of  delivery)  legal,  valid and  binding
obligations of the Company  enforceable  against the Company in accordance  with
their  respective  terms,  except  (i) to  the  extent  that  such  validity  or
enforceability  may be subject to or  affected  by any  bankruptcy,  insolvency,
reorganization,   moratorium,  liquidation  or  similar  laws  relating  to,  or
affecting  generally  the  enforcement  of,  creditors'  rights or  remedies  of
creditors  generally,  or by other equitable  principles of general application,
and (ii) as rights to indemnity and contribution  under the Registration  Rights
Agreement may be limited by Federal or state securities laws.

     3.3  Capitalization.  The capitalization of the Company as of June 1, 2004,
including  the  authorized  capital  stock,  the  number  of shares  issued  and
outstanding,  the  number  of  shares  reserved  for  issuance  pursuant  to the
Company's  stock  option  plans,  the  number of shares  reserved  for  issuance
pursuant to securities exercisable for, or convertible into or exchangeable for,
any shares of capital  stock,  is set forth on Schedule 3.3 hereof.  All of such
outstanding  shares of  capital  stock  have been,  or upon  issuance  shall be,
validly issued, fully paid and nonassessable.  No shares of capital stock of the
Company  (including the Preferred Stock) are subject to preemptive rights or any
other  similar  rights  of the  stockholders  of the  Company  or any  liens  or
encumbrances imposed or suffered by the Company. Except as disclosed in Schedule
3.3  hereof,  as of the date of this  Agreement,  (i) there  are no  outstanding
options,  warrants,  scrip, rights to subscribe for, calls or commitments of any
character  whatsoever  relating to, or securities or rights  convertible into or
exercisable or  exchangeable  for, any shares of capital stock of the Company or
any  of  its  subsidiaries,   or  contracts,   commitments,   understandings  or
arrangements  by which the Company or any of its  subsidiaries  is or may become
bound to issue  additional  shares of capital stock of the Company or any of its
subsidiaries,  (ii) issuance of the Securities  shall not trigger  anti-dilution
rights for any other  outstanding or authorized  securities of the Company,  and
(iii) there are no agreements or arrangements  under which the Company or any of
its  subsidiaries  is  obligated  to  register  the  sale of any of its or their
securities under the Securities Act (except the Registration  Rights Agreement).
The  Company  has  furnished  to ACS true and  correct  copies of the  Company's
Certificate of  Incorporation  as in effect on the date hereof  ("Certificate of
Incorporation"),  and the Company's  Bylaws as in effect on the date hereof (the
"Bylaws").  The Company has set forth on Schedule 3.3 hereof all instruments and
agreements  (other than the Certificate of Incorporation  and Bylaws)  governing
securities  convertible into or exercisable or exchangeable for capital stock of
the  Company  (and the  Company  shall  provide to ACS copies  thereof  upon the
request of ACS). All  outstanding  securities of the Company have been issued in
full  compliance  with an  exemption or  exemptions  from the  registration  and
prospectus delivery requirements of the Securities Act and from the registration
and  qualification  requirements of all applicable state securities laws. Except
as  otherwise  contemplated  by this  Agreement,  the  Company is not a party or
subject to any agreement or understanding which affects or relates to the voting
or  giving  of  written  consents  with  respect  to, or the  purchase  of,  any
securities of the Company.

     3.4 Issuance of Shares. The Securities are duly authorized and reserved for
issuance,   and  upon  issuance  shall  be  validly   issued,   fully  paid  and
non-assessable,  and free from all taxes, liens, claims and encumbrances imposed
or  suffered by the  Company  and shall not be subject to  preemptive  rights or
other similar rights of stockholders  of the Company.  The Common Stock issuable
upon conversion of the Preferred Stock has been reserved for issuance based upon
the initial  conversion  ratio and,  when issued upon  conversion,  will be duly
authorized  and  validly  issued,  fully paid and  nonassessable,  free from all
liens,  claims and encumbrances  imposed or suffered by the Company and will not
be subject to preemptive  rights or other similar rights of  stockholders of the
Company.

     3.5  No  Conflicts.  The  execution,   delivery  and  performance  of  this
Agreement,  the Registration Rights Agreement and the Collaboration Agreement by
the Company,  and the  consummation by the Company of transactions  contemplated
hereby and thereby (including,  without limitation, the issuance and reservation
for issuance,  as applicable,  of the Preferred  Stock) do not and shall not (a)
result in a  violation  of the  Certificate  of  Incorporation  or Bylaws or (b)
conflict with, or constitute a default (or an event which,  with notice or lapse
of time or both,  would become a default) under, or give to others any rights of
termination,   amendment,   acceleration  or  cancellation  of,  any  agreement,
indenture or  instrument  to which the Company or any of its  subsidiaries  is a
party, or result in a violation of any law, rule, regulation, order, judgment or
decree  (including U.S.  federal and state  securities  laws)  applicable to the
Company or any of its  subsidiaries,  or by which any  property  or asset of the
Company  or any of its  subsidiaries,  is bound  or  affected  (except  for such
possible   conflicts,   defaults,   terminations,   amendments,   accelerations,
cancellations  and  violations as would not,  individually  or in the aggregate,
have a Material Adverse Effect). Neither the Company nor any of its subsidiaries
is in violation of its  Certificate  of  Incorporation  or other  organizational
documents,  and neither the Company nor any of its  subsidiaries,  is in default
(and no event has occurred which has not been waived which, with notice or lapse
of time or both,  would put the Company or any of its  subsidiaries  in default)
under,  nor has there  occurred any event giving others (with notice or lapse of
time or both) any rights of termination, amendment, acceleration or cancellation
of, any  agreement,  indenture or  instrument to which the Company or any of its
subsidiaries is a party, except for possible  violations,  defaults or rights as
would not, individually or in the aggregate, have a Material Adverse Effect. The
businesses  of the Company and its  subsidiaries  are not being  conducted,  and
shall not be conducted,  in violation of any law, ordinance or regulation of any
governmental  entity,  except for possible  violations  the  sanctions for which
either  individually  or in the  aggregate  would  not have a  Material  Adverse
Effect. Except as set forth on Schedule 3.5 hereof, or except (A) such as may be
required  under the  Securities  Act in connection  with the  performance of the
Company's  obligations under the Registration Rights Agreement,  (B) filing of a
Form D with the SEC, and (C)  compliance  with the state  securities or Blue Sky
laws  of  applicable  jurisdictions,  and  (D)  the  filing  of  the  respective
Certificates of Designation,  the Company is not required to obtain any consent,
authorization or order of, or make any filing or registration with, any court or
governmental agency or any regulatory or self-regulatory  agency in order for it
to execute,  deliver or perform any of its obligations under this Agreement, the
Registration  Rights Agreement or the Collaboration  Agreement or to perform its
obligations in accordance with the terms hereof or thereof.

     3.6 SEC Reports. Except as disclosed in Schedule 3.6 hereof, as of the date
of this Agreement,  the Company has timely filed the SEC Reports  required to be
filed  by it  with  the  SEC  pursuant  to  the  reporting  requirements  of the
Securities  Exchange Act of 1934, as amended (the "Exchange  Act").  The Company
has made  available to ACS true and complete  copies of the SEC Reports,  except
for  exhibits,  schedules and  incorporated  documents.  As of their  respective
dates, the SEC Reports  complied in all material  respects with the requirements
of the  Exchange  Act and  the  rules  and  regulations  of the SEC  promulgated
thereunder  applicable to the SEC Reports,  and none of the SEC Reports,  at the
time they were filed with the SEC,  contained any untrue statement of a material
fact or  omitted  to state a  material  fact  required  to be stated  therein or
necessary in order to make the statements therein, in light of the circumstances
under which they were made, not  misleading.  None of the statements made in any
such SEC Reports which is required to be updated or amended under applicable law
has not been so updated or amended. The consolidated financial statements of the
Company  included in the SEC Reports have been prepared in accordance  with U.S.
generally accepted accounting  principles,  consistently  applied, and the rules
and  regulations  of the SEC during the periods  involved  (except (i) as may be
otherwise  indicated  in such  consolidated  financial  statements  or the notes
thereto, or (ii) in the case of unaudited interim statements, to the extent they
do not include  footnotes or are  condensed or summary  statements)  and present
accurately and completely in all material  respects the  consolidated  financial
position  of the  Company  and its  consolidated  subsidiaries  as of the  dates
thereof and the consolidated  results of their operations and cash flows for the
periods  then ended  (subject,  in the case of unaudited  statements,  to normal
year-end audit adjustments).  Except as set forth in a manner clearly evident to
a sophisticated  institutional investor in the consolidated financial statements
or the notes thereto of the Company included in the SEC Reports, the Company has
no liabilities,  contingent or otherwise, other than (i) liabilities incurred in
the ordinary course of business  consistent with past practice subsequent to the
date of such  financial  statements  and (ii)  obligations  under  contracts and
commitments  incurred in the ordinary  course of business  consistent  with past
practice and not required under generally accepted  accounting  principles to be
reflected in such financial  statements.  To the extent required by the rules of
the SEC applicable thereto, the SEC Reports contain a complete and accurate list
of all material  undischarged written or oral contracts,  agreements,  leases or
other  instruments to which the Company or any subsidiary is a party or by which
the  Company or any  subsidiary  is bound or to which any of the  properties  or
assets of the Company or any subsidiary is subject (each a "Contract").  None of
the Company,  its subsidiaries or, to the best knowledge of the Company,  any of
the other  parties  thereto,  is in breach or violation of any  Contract,  which
breach or violation would have a Material Adverse Effect.  No event,  occurrence
or condition  exists  which,  with the lapse of time,  the giving of notice,  or
both, would become a default by the Company or its subsidiaries thereunder which
would have a Material  Adverse  Effect.  The Company has not provided to ACS any
material  non-public  information or any other information  which,  according to
applicable law, rule or regulation,  should have been disclosed  publicly by the
Company but which has not been so disclosed.

     3.7 Absence of Certain Changes.  Since December 31, 2003, there has been no
material  adverse  change and no material  adverse  development in the business,
properties,  operations,  financial  condition or results of  operations  of the
Company.  The Company has not taken any steps and does not  currently  expect to
take any steps to seek  protection  pursuant to any  bankruptcy or  receivership
law,  nor does the  Company  have any  knowledge  or reason to believe  that its
creditors intend to initiate involuntary  bankruptcy proceedings with respect to
the Company.

     3.8 Absence of Litigation. Except as set forth in the SEC Reports, there is
no action,  suit,  proceeding,  inquiry or investigation before or by any court,
public board, government agency, or self-regulatory organization or body pending
or, to the  knowledge of the Company or any of its  subsidiaries,  threatened in
writing  against or affecting the Company,  any of its  subsidiaries,  or any of
their respective  directors or officers in their capacities as such, which could
reasonably be expected to result in an unfavorable  decision,  ruling or finding
which  would  have a  Material  Adverse  Effect or would  adversely  affect  the
transactions contemplated by this Agreement or any of the documents contemplated
hereby or which would adversely affect the validity or enforceability of, or the
authority  or ability of the  Company to perform  its  obligations  under,  this
Agreement  or any of such  other  documents.  There  are no  facts  known to the
Company which, if known by a potential claimant or governmental authority, could
reasonably be expected to give rise to a claim or proceeding  which, if asserted
or conducted with results unfavorable to the Company or any of its subsidiaries,
could reasonably be expected to have a Material Adverse Effect.

     3.9 Permits, Licenses;  Compliance with Laws; Company Products. Each of the
Company and each of its subsidiaries has all licenses, franchises,  permits, and
other  governmental  authorizations  and  approvals  necessary  to  conduct  its
business as currently conducted and as contemplated, and neither the Company nor
any of its subsidiaries is in violation of any such license, franchise,  permit,
or other governmental  authorization or approval, or any law applicable to it or
any of its  properties,  except  where  the  failure  to have any such  license,
franchise,  permit,  or other  governmental  authorization  or approval,  or the
existence of any such violation,  has not had and would not be reasonably likely
to have,  individually  or in the  aggregate,  a  Material  Adverse  Effect.  No
investigation  or review  by any  governmental  authority  with  respect  to the
Company or any of its  subsidiaries  is pending or, to the Company's  knowledge,
threatened.  No governmental authority has expressed to the Company an intention
to conduct any such investigation or review.

     3.10 Disclosure.  No information  relating to or concerning the Company set
forth in this  Agreement  contains an untrue  statement of a material  fact.  No
information  relating to or  concerning  the Company set forth in any of the SEC
Reports  contains a statement  of  material  fact that was untrue as of the date
such SEC Report was filed with the SEC.  The  Company has not omitted to state a
material fact necessary in order to make the statements  made herein or therein,
in light of the circumstances under which they were made, not misleading. Except
for the execution and  performance of this  Agreement,  no material fact (within
the  meaning  of the  federal  securities  laws  of  the  United  States  and of
applicable  state  securities laws) exists with respect to the Company which has
not been publicly disclosed.

     3.11 Acknowledgment Regarding ACS's Purchase of the Securities. The Company
acknowledges  and  agrees  that ACS is not  acting  as a  financial  advisor  or
fiduciary  of the  Company  (or in any similar  capacity)  with  respect to this
Agreement or the transactions  contemplated  hereby, that this Agreement and the
transaction  contemplated  hereby,  and  the  relationship  between  ACS and the
Company,  are  "arms-length,"  and that any statement made by ACS (except as set
forth in Article II), or any of its  representatives  or agents,  in  connection
with this Agreement and the transactions  contemplated hereby is not advice or a
recommendation, is merely incidental to ACS's purchase of the Securities and has
not  been  relied  upon  as  such in any way by the  Company,  its  officers  or
directors.  The Company further represents to ACS that the Company's decision to
enter into this  Agreement  and the  transactions  contemplated  hereby has been
based   solely  on  an   independent   evaluation   by  the   Company   and  its
representatives.

     3.12 S-2  Registration.  The Company is not currently  eligible to register
the Common Stock  underlying the conversion of Preferred Stock on a registration
statement on Form S-3 under the Securities Act. However, the Company is eligible
to use Form S-1 or S-2 under the Securities Act.

     3.13  Securities  Laws.  Assuming the accuracy of the  representations  and
warranties  of ACS  contained in Section 2 hereof on the date hereof and at each
Closing,  the offer, issue, and sale of the Preferred Stock and the offer of the
Common Stock issuable upon conversion of the Preferred Stock are exempt from the
registration and prospectus delivery requirements of the Securities Act and have
been registered or qualified (or are exempt from registration and qualification)
under the registration,  permit, or qualification requirements of all applicable
state securities laws. Neither the Company nor any distributor  participating on
the Company's  behalf in the transactions  contemplated  hereby (if any) nor any
person  acting for the  Company,  or any such  distributor,  has  conducted  any
"general  solicitation,"  as described in Rule 502(c) under  Regulation  D, with
respect to any of the Securities being offered hereby.

     3.14  No  Integrated  Offering.   Neither  the  Company,  nor  any  of  its
affiliates,  nor any  person  acting on its or their  behalf,  has  directly  or
indirectly  made any offers or sales of any security or solicited  any offers to
buy any security under  circumstances that would prevent the parties hereto from
consummating the transactions  contemplated hereby pursuant to an exemption from
the  registration  under  the  Securities  Act  pursuant  to the  provisions  of
Regulation  D.  The  transactions   contemplated  hereby  are  exempt  from  the
registration  requirements of the Securities  Act,  assuming the accuracy of the
representations and warranties herein contained of ACS.

     3.15 No Brokers.  The Company has taken no action  which would give rise to
any claim by any  person for  brokerage  commissions,  finder's  fees or similar
payments by ACS  relating to this  Agreement  or the  transactions  contemplated
hereby.

     3.16 Intellectual Property.

     (a) Schedule 3.16(a) hereof lists all patents and patent applications owned
or used by the Company or any of its subsidiaries that relate to the Therapeutic
Field (as  defined  in the  Collaboration  Agreement),  including  the owner and
jurisdictions  in which each such patent and patent  application has been issued
or registered or in which any application for such issuance and registration has
been filed. To the best of its knowledge,  the Company and its  subsidiaries are
the sole and exclusive  owner of, or otherwise  have a valid license or right to
use,  all  Proprietary  Rights  free and clear of any liens,  charges,  pledges,
mortgages, security interests, claims, options, warrants, or encumbrances of any
kind or character.  "Proprietary Rights" means all material inventions, patents,
patent applications,  patent disclosures,  trademarks,  trademark  applications,
service marks,  service mark  applications,  logos,  trade names,  domain names,
copyrights,   trade  secrets,  and  all  other  intellectual  property  (whether
patentable or unpatentable)  (i) associated with the Lead Drug or other PDT Drug
or PDT Device as each are defined in the  Collaboration  Agreement  or (ii) that
are  related  to the  business  of the  Company  or any of its  subsidiaries  as
presently  conducted or as presently  proposed to be conducted,  and each of the
Company or any subsidiary has the right to use all of its Proprietary  Rights in
all jurisdictions in which the Company or such subsidiary conducts its business.

     (b) No person has a right to receive a royalty or similar  payment from the
Company or any subsidiary for their use of any  Proprietary  Rights  pursuant to
any contractual arrangements entered into by the Company or any subsidiary as of
the date of this Agreement. Except as listed in Schedule 3.16(b), as of the date
of this  Agreement,  neither  the Company nor any  subsidiary  has any  licenses
granted,  sold,  or  otherwise  transferred  by or to it  (other  than  standard
licenses or rights to use granted to  customers  in the  ordinary  course of its
business)  nor other  agreements  to which any of them is a party,  relating  in
whole or in part to any of the  Proprietary  Rights.  The Company has  exclusive
access,  free of any  obligations  of any nature to any other Person (as defined
herein),  to the Lead  Drug  (and the  final  formulated  drug  product)  in the
Therapeutic Field used in the Phase I Trial, all as defined in the Collaboration
Agreement,  and will continue to maintain such exclusive  access for at least 48
months  from  the date  hereof.  "Person"  means  any  individual,  corporation,
partnership,  limited  liability  company,  association,  joint venture,  trust,
government or governmental  instrumentality,  agency,  division or office or any
other entity,  organization or group.  ACS  acknowledges  receipt of information
from the Company that the Lead Drug and the final  formulated  drug product will
be manufactured by Gilead Sciences,  Inc. ("Gilead") using Gilead's  proprietary
liposomal  formulation  technology ("Gilead's  Technology").  The Company may be
required  to pay a royalty to Gilead for the use of the Gilead  Technology,  but
such  requirement  will not prevent the Company's  exclusive  access to the Lead
Drug and the final formulated drug product.

     (c)  Either  the  Company  or a  subsidiary  exclusively  owns  or has  the
exclusive  right to use, sell,  license,  or sublicense  each of the Proprietary
Rights. As of the date of this Agreement,  none of the Proprietary  Rights owned
by the Company or any  subsidiary is involved in any pending or to the Company's
knowledge threatened  litigation.  No third party (i) has any ownership right in
or the  right to use any such  Proprietary  Rights,  (ii) as of the date of this
Agreement  has  notified  the  Company  or any  subsidiary  that it  claims  any
ownership of or right to use such Proprietary  Rights, or (iii) to the Company's
knowledge  as of the  date  of this  Agreement,  is  infringing  upon  any  such
Proprietary  Rights  owned by the Company or any  subsidiary  in any way. To the
Company's  knowledge as of the date of this  Agreement,  the  Company's  and the
subsidiaries' use of the Proprietary  Rights in the conduct of their businesses,
including the production,  marketing,  selling, and servicing of their products,
is not infringing upon or otherwise violating the rights of any third party, and
no proceedings  have been instituted  against or notices received by the Company
and any subsidiary  alleging that the Company's or any  subsidiary's  use of the
Proprietary  Rights  infringes upon or otherwise  violates any rights of a third
party or that any of the Proprietary Rights are invalid.  The Proprietary Rights
shall  not  cease to be valid  and in full  force  and  effect  by reason of the
execution,  delivery,  and performance of this Agreement or the  consummation of
the transactions contemplated hereby.

     (d) To the Company's  knowledge,  all  Proprietary  Rights that are used or
incorporated  into the  products  of the  Company  and any  subsidiary  that are
proprietary  to  the  Company  and  the  subsidiaries,   including  those  under
development,  were  developed by current or former  employees,  consultants,  or
agents of the Company or one of the  subsidiaries  and are free of any claims of
such employees, consultants, or agents thereto. To the Company's knowledge, none
of such  employees,  consultants,  or agents has violated in any material manner
any agreements with respect to the use or disclosure of confidential information
or Proprietary Rights.

     3.17 Key  Employees.  No Key Employee,  to the best of the knowledge of the
Company and its subsidiaries,  is, or is now expected to be, in violation of any
material  term  of  any  employment  contract,  confidentiality,  disclosure  or
proprietary  information  agreement,  non-competition  agreement,  or any  other
contract or agreement or any restrictive covenant,  and the continued employment
of each Key Employee does not subject the Company or any of its  subsidiaries to
any liability with respect to any of the foregoing matters. No Key Employee has,
to the best of the knowledge of the Company and its subsidiaries,  any intention
to  terminate  his  employment  with,  or services to, the Company or any of its
subsidiaries  nor is any such Key Employee subject to any constraints that would
cause such Key  Employee to be unable to devote his full time  attention  to the
employment or services of the Company or its subsidiaries.  "Key Employee" means
each of Gary S. Kledzik,  Chairman of the Board and Chief Executive Officer, and
David E. Mai, President.

     3.18 Rights Plan. The Company has in effect a shareholders rights plan (the
"Plan").  However,  the  transactions  contemplated  herein will not trigger the
Plan.

     3.19  Insurance.  The  Company  has in  force  fire,  casualty,  and  other
insurance policies, with extended coverage,  sufficient in amount to allow it to
replace  any of its  material  properties  or assets  which  might be damaged or
destroyed or sufficient to cover liabilities to which the Company may reasonably
become  subject,  and such types and amounts of other  insurance with respect to
its business and properties, on both a per occurrence and an aggregate basis, as
are customarily  carried by persons  engaged in the same or similar  business as
the Company.  No default or event has occurred that could give rise to a default
under any such policy. The Company does not carry product liability insurance as
of the date of this  Agreement,  and ACS is not  requiring the Company to obtain
such product liability insurance coverage.

                                   ARTICLE IV

                                    COVENANTS

     4.1  Best  Efforts.   The  parties  hereto  shall  use  their  commercially
reasonable  best efforts to timely satisfy each of the  conditions  described in
Articles VI and VII of this Agreement.

     4.2  Securities  Laws.  The Company agrees to file a Form D with respect to
the Securities with the SEC as required under Regulation D and to provide a copy
thereof  to ACS within  fifteen  (15) days  after the date of the  Closing.  The
Company agrees to file a Form 8-K disclosing this Agreement and the transactions
contemplated  hereby with the SEC within ten (10)  business  days  following the
date of the Closing.  The Company shall, on or prior to the date of the Closing,
take such action as is necessary to sell the Securities to ACS under  applicable
securities laws of the states of the United States,  and shall provide  evidence
of any such action so taken to ACS on or prior to the date of the Closing.

     4.3  Reporting  Status.  So  long  as  ACS  beneficially  owns  any  of the
Securities,  the Company shall timely file all reports required to be filed with
the SEC pursuant to the Exchange  Act, and the Company  shall not  terminate its
status as an issuer  required to file reports under the Exchange Act even if the
Exchange  Act  or  the  rules  and  regulations  thereunder  would  permit  such
termination.

     4.4  Information.  The Company  agrees to make  available  upon request the
following  reports  to ACS  until  ACS  transfers,  assigns  or sells all of its
Securities in transactions in which the transferee is (unless such transferee is
an affiliate of the Company) not subject to securities law resale  restrictions:
(a) its Annual  Report on Form 10-K,  its  Quarterly  Reports on Form 10-Q,  any
proxy  statements  and any Current  Reports on Form 8-K; (b) copies of all press
releases  issued by the  Company or any of its  subsidiaries,  and (c) any other
financial information that ACS may reasonably request;  provided,  however, that
the  Company  shall  not  be  required  to  give  ACS  any  material   nonpublic
information.  The  Company  further  agrees  to  promptly  provide  to  ACS  any
information  with respect to the  Company,  its  properties,  or its business or
ACS's  investment as ACS may reasonably  request;  provided,  however,  that the
Company shall not be required to give ACS any material nonpublic information. If
any information  requested by ACS from the Company contains  material  nonpublic
information,  the Company  shall  inform ACS, in writing,  that the  information
requested contains material nonpublic  information and shall in no event provide
such  information to ACS without the express  written consent of ACS after being
so informed.

     4.5 Prospectus  Delivery  Requirement.  ACS understands that the Securities
Act may require delivery of a prospectus relating to the Common Stock underlying
the conversion of Preferred Stock in connection  with any sale thereof  pursuant
to a registration  statement under the Securities Act covering the resale by ACS
of the  Common  Stock  being  sold,  and ACS shall  comply  with the  applicable
prospectus  delivery  requirements  of the Securities Act in connection with any
such sale.

     4.6 Corporate  Existence.  So long as ACS  beneficially  owns any Preferred
Stock, the Company shall maintain its corporate  existence,  except in the event
of a merger,  consolidation or sale of all or substantially all of the Company's
assets, as long as the surviving or successor entity in such transaction assumes
the Company's  obligations  hereunder and under the agreements  and  instruments
entered into in connection herewith.

     4.7 Hedging Transactions. ACS does not have an existing short position with
respect to the Preferred Stock or the Common Stock  underlying the conversion of
Preferred Stock. ACS agrees not to, directly or indirectly, enter into any short
sales with respect to the  Preferred  Stock or the Common Stock  underlying  the
conversion  of  Preferred  Stock  prior to the date on which ACS is  entitled to
sell,  convert,  or transfer the number of shares of  Preferred  Stock or Common
Stock as to which ACS proposes to establish a short  position.  This Section 4.7
shall not prohibit ACS from, at any time,  entering into options  contracts with
respect to the Preferred Stock or the Common Stock  underlying the conversion of
Preferred Stock,  including puts and calls including  delivering Preferred Stock
or Common Stock in satisfaction of any exercised options.

     4.8 Use of Proceeds.  The Company shall use the proceeds of the sale of the
Securities for working capital for its subsidiary, Miravant Cardiovascular, Inc.
("MCI"), and the initiation of the Pre-clinical Development Program, and Phase I
Trial in accordance with the Collaboration Agreement.

     4.9 Sole Purchaser.  As of the date of each Closing,  ACS shall be the sole
purchaser  and holder of the  Preferred  Stock.  The Company shall not issue any
Preferred  Stock to any person or entity  other than ACS without  ACS's  written
consent.

     4.10   Collaboration   Agreement.   ACS  may   immediately   terminate  the
Collaboration  Agreement  pursuant  to  the  terms  of  Section  12.2(e)  of the
Collaboration  Agreement  in the  event  that  the  Company  fails  to meet  the
conditions  that are needed to be  satisfied  in order to  obligate  ACS to make
either the Interim  Investment or Final  Investment that are set out in Sections
6.4 and 6.5 herein.

                                    ARTICLE V

           LEGEND REMOVAL, TRANSFER, CERTAIN SALES, ADDITIONAL SHARES

     5.1 Removal of Legend. Upon the request of ACS, the Legend shall be removed
and the Company shall issue a  certificate  without such Legend to the holder of
any Security upon which it is stamped, and a certificate for a security shall be
originally  issued  without  the  Legend,  if, (a) the sale of such  Security is
registered  under the Securities  Act, (b) such holder provides the Company with
an opinion of counsel,  in form,  substance and scope  customary for opinions of
counsel in comparable  transactions  and reasonably  satisfactory to the Company
and its counsel (the  reasonable cost of which shall be borne by the Company if,
after  one (1) year,  neither  an  effective  registration  statement  under the
Securities  Act or Rule 144 is  available in  connection  with such sale) to the
effect  that a public  sale or transfer  of such  Security  may be made  without
registration  under  the  Securities  Act  pursuant  to an  exemption  from such
registration  requirements or (c) such Security can be sold pursuant to Rule 144
and the holder provides the Company with reasonable assurances that the Security
can be so sold without  restriction or (d) such Security can be sold pursuant to
Rule 144(k). ACS agrees to sell all Securities, including those represented by a
certificate(s)  from which the Legend has been removed, or which were originally
issued without the Legend,  pursuant to an effective registration  statement, in
accordance  with the  manner  of  distribution  described  in such  registration
statement  and to deliver a  prospectus  in  connection  with such  sale,  or in
compliance  with  an  exemption  from  the  registration   requirements  of  the
Securities  Act.  In the event the Legend is removed  from any  Security  or any
Security  is issued  without  the Legend and the  Security  is to be disposed of
other than pursuant to the registration  statement or pursuant to Rule 144, then
prior to,  and as a  condition  to,  such  disposition  such  Security  shall be
relegended  as  provided  herein  in  connection  with  any  disposition  if the
subsequent  transfer thereof would be restricted under the Securities Act. Also,
in the event the Legend is removed  from any  Security or any Security is issued
without the Legend and thereafter the effectiveness of a registration  statement
covering the resale of such Security is suspended or the Company determines that
a supplement  or amendment  thereto is required by applicable  securities  laws,
then upon  reasonable  advance notice to ACS holding such Security,  the Company
may require that the Legend be placed on any such  Security  that cannot then be
sold pursuant to an effective registration statement or Rule 144 or with respect
to which the opinion referred to in clause (b) next above has not been rendered,
which  Legend shall be removed  when such  Security  may be sold  pursuant to an
effective registration statement or Rule 144 or such holder provides the opinion
with respect thereto described in clause (b) next above.

     5.2 Transfer  Agent  Instructions.  The Company shall instruct its transfer
agent to issue certificates,  registered in the name of ACS or its nominee,  for
the Preferred  Stock in such amounts  determined in accordance with the terms of
the Preferred Stock. Such certificates  shall bear the Legend only to the extent
provided by Section 5.1 above. The Company  covenants that no instruction  other
than such  instructions  referred  to in this  Article V, or the  suspension  of
trading under a prospectus as set forth in the  Registration  Rights  Agreement,
and stop transfer  instructions to give effect to Section 2.6 hereof in the case
of the Preferred Stock prior to registration of the Common Stock  underlying the
conversion of Preferred  Stock under the  Securities  Act, shall be given by the
Company to its transfer agent and that the Securities  shall otherwise be freely
transferable  on the books and records of the  Company.  Nothing in this Section
shall affect in any way ACS's obligations and agreement set forth in Section 5.1
hereof to resell the Securities pursuant to an effective  registration statement
and to deliver a prospectus in connection  with such sale or in compliance  with
an exemption from the registration  requirements of applicable  securities laws.
If (a) ACS  provides the Company  with an opinion of counsel,  which  opinion of
counsel shall be in form,  substance and scope customary for opinions of counsel
in comparable  transactions  and reasonably  satisfactory to the Company and its
counsel  (the  reasonable  cost of which shall be borne by the Company if, after
one (1) year, neither an effective  registration  statement under the Securities
Act or Rule 144 is available in connection  with such sale),  to the effect that
the Securities to be sold or transferred may be sold or transferred  pursuant to
an exemption from  registration or (b) ACS transfers  Securities to an affiliate
which is an  accredited  investor  (within the meaning of Regulation D under the
Securities  Act) and which  delivers  to the  Company in  written  form the same
representations,  warranties  and covenants made by ACS hereunder or pursuant to
Rule 144,  the  Company  shall  permit  the  transfer,  and,  in the case of the
Preferred  Stock,  promptly  instruct  its  transfer  agent to issue one or more
certificates  in such name and in such  denomination  as  specified  by ACS. The
Company  acknowledges  that a breach by it of its  obligations  hereunder  shall
cause  irreparable  harm to ACS by  vitiating  the  intent  and  purpose  of the
transaction contemplated hereby. Accordingly,  the Company acknowledges that the
remedy  at law for a breach of its  obligations  under  this  Article V shall be
inadequate  and  agrees,  in the event of a breach or  threatened  breach by the
Company of the  provisions  of this  Article V, that ACS shall be  entitled,  in
addition to all other  available  remedies,  to an  injunction  restraining  any
breach and requiring  immediate issuance and transfer,  without the necessity of
showing economic loss and without any bond or other security being required.

                                   ARTICLE VI

                                   CONDITIONS

     6.1  Conditions  to Each Closing for the Sale and Purchase of the Preferred
Stock. The obligation of ACS to purchase, and the Company to sell, the Preferred
Stock to be purchased at each Closing is subject to the  satisfaction of each of
the following conditions:

     (a) No  statute,  rule,  regulation,  executive  order,  decree,  ruling or
injunction  shall have been  enacted,  entered,  promulgated  or endorsed by any
court or governmental authority of competent jurisdiction or any self-regulatory
organization  having  authority  over  the  matters  contemplated  hereby  which
restricts or prohibits the consummation of any of the transactions  contemplated
by this Agreement.

     (b) The  Company  shall have  secured  all  permits,  consents,  approvals,
resolutions and authorizations  that shall be necessary or required lawfully for
the Company to consummate the transactions contemplated by this Agreement and to
issue the Securities.

     6.2 Conditions to the Company's Obligation to Sell the Preferred Stock. The
obligation of the Company  hereunder to issue and sell the  Preferred  Shares to
ACS at each  Closing  is  subject  to the  satisfaction,  as of the date of such
Closing  (provided that this condition is for the Company's sole benefit and may
be  waived  by  the   Company  at  any  time  in  its  sole   discretion),   the
representations  and warranties of ACS shall be true and correct in all material
respects  as of the date when made and as of the  Closing as though made at that
time  (except for  representations  and  warranties  that speak as of a specific
date),  and ACS shall have  performed,  satisfied  and  complied in all material
respects  with  the  covenants,  agreements  and  conditions  required  by  this
Agreement to be performed,  satisfied or complied with by ACS at or prior to the
Closing.

     6.3 Conditions to ACS's Obligation to Purchase Series A-1 Preferred Shares.
The obligation of ACS hereunder to purchase the Series A-1 Preferred Stock to be
purchased by it on the Closing Date of the Initial  Investment is subject to the
satisfaction of the following conditions, provided that these conditions are for
ACS's  sole  benefit  and  may be  waived  by ACS at  any  time  in ACS `s  sole
discretion:

     (a) The  representations  and  warranties  of the Company shall be true and
correct in all material  respects as of the date when made and as of the Closing
as though made at that time,  except for those  representations  and  warranties
that are  qualified  by  materiality,  which  shall be true and  correct  in all
respects,  and the Company shall have  performed,  satisfied and complied in all
material respects with the covenants, agreements and conditions required by this
Agreement to be performed, satisfied or complied with by the Company at or prior
to the Closing.

     (b) The  Certificate of Designation  for the Series A-1 Preferred  Stock in
the form  attached as Exhibit A hereto shall have been filed with the  Secretary
of State of the State of  Delaware  and shall  continue  to be in full force and
effect as of the Closing Date of the Initial Investment.

     (c) The Common Stock issuable upon  conversion of the Preferred Stock shall
have been duly authorized and reserved for issuance upon such conversion.

     (d)  The  Company  shall  have  delivered  to ACS a  certificate  in a form
approved by ACS,  executed  by the Chief  Executive  Officer or Chief  Financial
Officer of the Company, dated as of the Closing of the Initial Investment to the
effect that the  conditions  specified in  subsections  (a), (b) and (c) of this
Section 6.3 have been satisfied.

     (e) ACS shall have  received from the  Company's  Secretary,  a certificate
having  attached  thereto  (i)  the  Company's   Certificate  of  Incorporation,
including the  Certificate of Designation  for the Series A-1 Preferred Stock as
in  effect  at the  time of the  Closing  of the  Initial  Investment,  (ii) the
Company's  Bylaws  as in  effect  at the  time  of the  Closing  of the  Initial
Investment, (iii) resolutions approved by the Board of Directors authorizing the
transactions  contemplated hereby and (iv) good standing certificates (including
tax  good   standing)   with  respect  to  the  Company   from  the   applicable
authority(ies)  in Delaware and any other  jurisdiction  in which the Company is
qualified  to do  business,  dated as of a recent date before the Closing of the
Initial Investment.

     6.4 Conditions to ACS's Obligation to Purchase Series A-2 Preferred Shares.
The obligation of ACS hereunder to purchase the Series A-2 Preferred Stock to be
purchased by it on the Closing Date of the Interim  Investment is subject to the
satisfaction of each of the following conditions, provided that these conditions
are for ACS's  sole  benefit  and may be waived by ACS at any time in ACS's sole
discretion:

     (a) The Company shall have delivered to ACS the reports listed in Exhibit F
evidencing the completion of Good Laboratory Practice animal studies relating to
the  Lead  Drug  (as  defined  in  the  Collaboration  Agreement)  prior  to the
submission to the United States Food and Drug Administration ("FDA") of the INDA
(as defined in the Collaboration  Agreement)  relating to the Lead Drug or other
PDT Drug.

     (b) The  Company  shall have  delivered  to ACS proof that the  Company has
submitted an INDA relating to a Lead Drug or other PDT Drug to the FDA.

     (c) The  Company  shall  certify  that there has been no  material  adverse
change in the  financial  condition  of the Company  from the date hereof to the
Closing Date of the Interim  Investment.  In addition,  the  representations and
warranties of the Company shall be true and correct as of the date when made and
as of the Closing of the Interim  Investment as though made at that time and the
Company shall have  performed,  satisfied and complied in all material  respects
with the covenants,  agreements and conditions  required by this Agreement to be
performed,  satisfied or complied with by the Company at or prior to the Closing
of the Interim  Investment.  ACS shall have received a certificate,  executed by
the Chief Executive Officer or Chief Financial Officer of the Company,  dated as
of the Closing of the Interim Investment to the foregoing effect.

     (d)  The  Company  shall  have  delivered  to  ACS  the  Audited  Financial
Statements  (as  defined  in Section  7.1(a))  and other  financial  information
evidencing that it has invested no less than  $2,000,000  during the period from
the date hereof to the date on which the  conditions of this Section 6.4 are met
(not  including the amounts of the purchase  price for the Preferred  Stock that
will be committed for MCI's working capital  pursuant to Section 4.8 hereof) for
MCI's ongoing working capital needs. * .

     (e) The  Certificate of Designation  for the Series A-2 Preferred  Stock in
the form of Exhibit B attached  hereto shall have been filed with the  Secretary
of State of the State of  Delaware  and shall  continue  to be in full force and
effect as of the Closing Date of the Interim Investment.

     (f) ACS shall have  received from the  Company's  Secretary,  a certificate
having  attached  thereto  (i)  the  Company's   Certificate  of  Incorporation,
including the Certificates of Designation for the Series A-1 Preferred Stock and
the Series A-2  Preferred  Stock as in effect at the time of the  Closing of the
Interim  Investment,  (ii) the Company's  Bylaws as in effect at the time of the
Closing  of  the  Interim  Investment,  and  (iii)  good  standing  certificates
(including  tax good  standing)  with respect to the Company from the applicable
authority(ies)  in Delaware and any other  jurisdiction  in which the Company is
qualified  to do  business,  dated as of a recent date before the Closing of the
Interim Investment.

     (g) The  conditions in this Section 6.4 must have been  satisfied or waived
by ACS no later than 24 months from the date hereof.

     6.5 Conditions to ACS's Obligation to Purchase Series A-3 Preferred Shares.
The obligation of ACS hereunder to purchase the Series A-3 Preferred Stock to be
purchased  by it on the Closing Date of the Final  Investment  is subject to the
satisfaction of each of the following conditions, provided that these conditions
are for ACS's  sole  benefit  and may be waived by ACS at any time in ACS's sole
discretion:

     (a) The Company  shall have  completed the Phase I Trial (as defined in the
Collaboration  Agreement)  and  shall  have  delivered  to ACS the Phase I Trial
Safety Report that complies  with the  requirements  set forth in Exhibit G. The
completion  of the  Phase I Trial  is  defined  as the time  when  all  patients
enrolled in the trial have been followed-up  according to the trial protocol and
any  additional  FDA  required  follow-up  and when all  Phase I Trial  clinical
reports and data have been provided to ACS.

     (b) The Company  shall have  delivered to ACS the data and analysis for the
clinical  readiness review for the PDT Device.  "Clinical  readiness" means that
the device would have met acceptable Good Manufacturing  Practices guidelines or
the FDA Investigational  Device Exemption/510K  approval guidelines  (including,
for example,  such items as design,  material  acceptability,  manufacturing and
quality  processes)  for  use  in  patients  as  indicated  in  reports  or  FDA
documentation provided by the Company to ACS.

     (c) The  Company  shall  certify  that there has been no  material  adverse
change in the  financial  condition  of the Company  from the date hereof to the
Closing Date of the Final  Investment.  In  addition,  the  representations  and
warranties of the Company shall be true and correct as of the date when made and
as of the  Closing of the Final  Investment  as though made at that time and the
Company shall have  performed,  satisfied and complied in all material  respects
with the covenants,  agreements and conditions  required by this Agreement to be
performed,  satisfied or complied with by the Company at or prior to the Closing
of the Final Investment. ACS shall have received a certificate,  executed by the
Chief Executive Officer or Chief Financial  Officer of the Company,  dated as of
the Closing of the Final Investment to the foregoing effect.

     (d) The Company shall have  delivered to ACS Audited  Financial  Statements
and other  financial  information  evidencing  that it has invested no less than
$3,000,000  from the date  hereof  to the date on which the  conditions  of this
Section 6.5 are met (not  including  the amounts of the  purchase  price for the
Preferred  Stock that will be committed  for MCI's working  capital  pursuant to
Section 4.8 hereof or the amount required to be invested by the Company pursuant
to Section 6.4(d) hereof) for MCI's ongoing working capital needs. * .

     (e) The  Certificate of Designation  for the Series A-3 Preferred  Stock in
the form of Exhibit C attached  hereto shall have been filed with the  Secretary
of State of the State of  Delaware  and shall  continue  to be in full force and
effect as of the Closing Date of the Interim Investment.

     (f) ACS shall have  received from the  Company's  Secretary,  a certificate
having  attached  thereto  (i)  the  Company's   Certificate  of  Incorporation,
including the  Certificates of Designation  for the Series A-1 Preferred  Stock,
the Series A-2 Preferred Stock and the Series A-3 Preferred  Stock, as in effect
at the time of the Closing of the Final Investment, (ii) the Company's Bylaws as
in effect at the time of the  Closing  of the Final  Investment,  and (iii) good
standing certificates  (including tax good standing) with respect to the Company
from the applicable  authority(ies)  in Delaware and any other  jurisdiction  in
which the Company is qualified to do business,  dated as of a recent date before
the Closing of the Final Investment.

     (g) The  conditions in this Section 6.5 must have been  satisfied or waived
by ACS no later than 48 months from the date hereof.

     6.6 No Obligation.

     (a) Notwithstanding  anything to the contrary, ACS shall have no obligation
to purchase  any  Securities  pursuant to the terms of this  Agreement if at any
time:

                           (i) the financial statements and other reports of the
         Company indicates a material decrease in the allocation of resources to
         MCI or to the development, pre-clinical and clinical investigations of
         light activated compositions or drugs and related devices or systems
         for use in the treatment of cardiovascular diseases; or

                           (ii) the Company or any of its affiliates is unable
         to obtain adequate supplies of the compounds and derivatives of these
         compounds necessary for the development, pre-clinical and clinical
         investigations of the Lead Drug or other PDT Drug.

     (b) Notwithstanding  anything to the contrary, ACS shall have no obligation
to purchase any Series A-3 Preferred Stock in the Final Investment if:

                           (i) the FDA does not grant the Company the INDA
         relating to the Lead Drug within * of the initial submission;

                           (ii) the first human patient in the Phase I Trial has
         not been enrolled within * of the initial submission of the INDA
         relating to the Lead Drug; or

                           (iii) the enrollment of all patients in the Phase I
         Trial has not been completed within * of the enrollment date of the
         first human patient.

                                   ARTICLE VII

                                    COVENANTS

     7.1 Delivery of Financial  Statements.  The Company  shall  deliver to each
holder of Securities:


     (a) as soon as practicable,  but in any event within one hundred (100) days
after the end of each fiscal year of the Company,  an income  statement for such
fiscal  year,  a balance  sheet of the Company and  statement  of  stockholder's
equity as of the end of such year,  and a statement of cash flows for such year,
such  year-end  financial  reports  to  be in  reasonable  detail,  prepared  in
accordance  with  generally  accepted  accounting  principles,  and  audited and
certified by an  independent  public  accounting  firm of nationally  recognized
standing selected by the Company (the "Audited Financial Statements");

     (b) as soon as  practicable,  but in any event within sixty (60) days after
the end of each of the three (3)  quarters of each  fiscal year of the  Company,
(i) an unaudited  profit or loss  statement,  a statement of cash flows for such
fiscal  quarter  and an  unaudited  balance  sheet as of the end of such  fiscal
quarter of the Company and (ii) monthly  breakdowns of  expenditure  information
for MCI;

     (c) as soon as practicable,  but in any event thirty (30) days prior to the
end of each fiscal  year,  financial  projections,  including at least a balance
sheet and income statement, for MCI for the upcoming fiscal year; and

     (d) any other  financial  information as ACS may reasonably  request to the
extent such  information  is kept by the Company or MCI in the normal  course of
business;  provided, however, that the Company shall not be obligated to provide
any material nonpublic information.

     7.2 Project Covenants.  In addition to the  representations and obligations
of the Company set forth elsewhere in this Agreement,  the  Registration  Rights
Agreement and in the Collaboration Agreement, the Company also:

     (a) represents that  $12,000,000 is currently a reasonable  estimate of the
Company's costs and expenses  (direct and indirect) to complete the pre-clinical
and the Phase I  feasibility  trial  stages of the project  contemplated  by the
Collaboration  Agreement  and to  operate  and  support  MCI as it is  currently
proposed to be operated,  including  amounts paid to the Company for performance
of activities and supply of services on behalf of MCI; and

     (b) agrees that the Company shall be responsible for any costs and expenses
in excess of the $12,000,000  contemplated by this Agreement reasonably required
to complete the  pre-clinical  and the Phase I  feasibility  trial stages of the
project contemplated by the Collaboration Agreement.

                                  ARTICLE VIII

                          GOVERNING LAW; MISCELLANEOUS

     8.1 Governing Law;  Jurisdiction.  This Agreement  shall be governed by and
construed in accordance with the laws of the State of California  without giving
effect to conflict-of-laws principles. The parties hereto irrevocably consent to
the jurisdiction of the United States federal courts and state courts located in
the County of Santa Clara in the State of  California  in any suit or proceeding
based on or arising under this Agreement or the transactions contemplated hereby
and irrevocably  agree that all claims in respect of such suit or proceeding may
be  determined  in  such  courts.   The  parties   hereto  agree  that  a  final
non-appealable  judgment in any such suit or proceeding  shall be conclusive and
may be enforced in other  jurisdictions by suit on such judgment or in any other
lawful manner. The parties hereto irrevocably waive any right to a trial by jury
under applicable law.

     8.2   Counterparts.   This  Agreement  may  be  executed  in  two  or  more
counterparts,  including, without limitation, by facsimile transmission,  all of
which  counterparts  shall be  considered  one and the same  agreement and shall
become effective when  counterparts have been signed by each party and delivered
to the other party.  In the event any  signature  page is delivered by facsimile
transmission,  the party  using such means of delivery  shall  cause  additional
original  executed  signature pages to be delivered to the other parties as soon
as practicable thereafter.

     8.3  Headings.  The  headings  of this  Agreement  are for  convenience  of
reference  and shall not form part of, or affect  the  interpretation  of,  this
Agreement.

     8.4  Severability.  If any provision of this Agreement  shall be invalid or
unenforceable in any jurisdiction, such invalidity or unenforceability shall not
affect the validity or  enforceability of the remainder of this Agreement or the
validity or enforceability of this Agreement in any other jurisdiction.

     8.5  Entire  Agreement:  Amendments.  This  Agreement  and the  instruments
referenced  herein contain the entire  understanding of the parties with respect
to the maters covered herein and therein and, except as  specifically  set forth
herein or  therein,  neither  the  Company  nor ACS  makes  any  representation,
warranty,  covenant or undertaking with respect to such matters. No provision of
this  Agreement may be waived other than by an  instrument in writing  signed by
the party to be charged with  enforcement and no provision of this Agreement may
be amended other than by an instrument in writing signed by the Company and ACS.

     8.6 Notice. Any notice herein required or permitted to be given shall be in
writing  and may be  personally  served or  delivered  by  nationally-recognized
overnight  courier or by  facsimile  machine  confirmed  telecopy,  and shall be
deemed delivered at the time and date of receipt (which shall include  telephone
line facsimile transmission). The addresses for such communications shall be:

                  If to the Company:
                  ------------------
                  Miravant Medical Technologies
                  336 Bollay Drive
                  Santa Barbara, CA  93117
                  Attention:  John M. Philpott
                  Facsimile:  (805) 685-1901

                  with copy (which will not constitute notice) to:

                  Sheppard Mullin Richter & Hampton, LLP
                  800 Anacapa Street
                  Santa Barbara, CA 93101
                  Attention:  Joseph E. Nida, Esq.
                  Facsimile:  (805) 568-5516

                  with copy (which will not constitute notice) to:

                  Wilson Sonsini Goodrich & Rosati
                  650 Page Mill Road
                  Palo Alto, CA 94304-1050
                  Attention:  John Sheridan, Esq.
                  Facsimile:  (650) 493-6811

                  If to ACS:

                  Advanced Cardiovascular Systems, Inc.
                  3200 Lakeside Drive
                  Santa Clara, CA 95054-2807
                  Attention:  General Counsel
                  Facsimile:  (408) 845-3987

                  with a copy (which will not constitute notice) to:

                  Faegre & Benson LLP
                  2200 Wells Fargo Center
                  90 South Seventh Street
                  Minneapolis, MN 55409
                  Attention:  Michael A. Stanchfield
                  Facsimile:  (612) 766-1600

Each party hereto shall provide notice to the other parties of any change in
address.

     8.7 Successors and Assigns.  This Agreement shall be binding upon and inure
to the benefit of the  parties and their  successors  and  assigns.  Neither the
Company  nor ACS shall  assign  this  Agreement  or any  rights  or  obligations
hereunder  without the prior written consent of the other.  Notwithstanding  the
foregoing,  ACS may assign its rights and  obligations  hereunder  to any of its
"affiliates,"  as that term is defined  under the  Securities  Act,  without the
consent  of the  Company so long as such  affiliate  is an  accredited  investor
(within  the meaning of  Regulation  D under the  Securities  Act) and agrees in
writing to be bound by this  Agreement.  This  provision  shall not limit  ACS's
right to transfer the  Securities  pursuant to the terms of this Agreement or to
assign ACS's rights  hereunder to any such  transferee.  In that regard,  if ACS
sells all or part of its  Preferred  Stock to someone  that  acquires the shares
subject to restrictions on  transferability  (other than  restrictions,  if any,
arising out of the  transferee's  status as an  affiliate of the  Company),  ACS
shall be permitted to assign its rights hereunder,  in whole or in part, to such
transferee.

     8.8 Third Party  Beneficiaries.  This Agreement is intended for the benefit
of the parties hereto and their respective  permitted successors and assigns and
is not for the benefit  of, nor may any  provision  hereof be  enforced  by, any
other person.

     8.9 Survival and Indemnification. The representations and warranties of the
Company and the  agreements  and covenants  shall survive the closing  hereunder
notwithstanding  any due  diligence  investigation  conducted by or on behalf of
ACS. The Company agrees to indemnify and hold harmless,  and advance expenses as
they are  incurred to, ACS and each of ACS `s  officers,  directors,  employees,
partners,  agents and  affiliates  for loss or damage  arising as a result of or
related  to (i) any  breach  or  alleged  breach  by the  Company  of any of its
representations, warranties, covenants or obligations set forth herein, (ii) any
cause of action,  suit or claim  brought or made  against  ACS or its  officers,
directors, employees, partners, agents or affiliates by a third party (including
for these  purposes a  derivative  action  brought on behalf of the Company) and
arising out of or resulting  from (A) the  execution,  delivery,  performance or
enforcement of this Agreement or any other  certificate,  instrument or document
contemplated  hereby  or  thereby  and (B)  any  transaction  financed  or to be
financed in whole or in part,  directly or indirectly,  with the proceeds of the
issuance and sale of the Securities, or (iii) the status of ACS or holder of the
Securities  as an investor  in the  Company.  To the extent  that the  foregoing
undertaking  by the Company  may be  unenforceable  for any reason,  the Company
shall make the maximum  contribution to the payment and  satisfaction of each of
such liabilities  which is permissible under applicable law. Except as otherwise
set forth herein,  the mechanics and  procedures  with respect to the rights and
obligations  under  this  Section  8.9  shall be the same as those  set forth in
Section 6(c) of the  Registration  Rights  Agreement.  The  representations  and
warranties  of ACS shall survive the Closing  hereunder and ACS shall  indemnify
and hold  harmless the Company and each of its officers,  directors,  employees,
partners,  agents and  affiliates  for any loss or damage arising as a result of
the breach of ACS's representations and warranties.

     8.10 Further  Assurances.  Each party hereto shall do and perform, or cause
to be done and  performed,  all such further acts and things,  and shall execute
and deliver all such other agreements, certificates,  instruments and documents,
as the other party may  reasonably  request in order to carry out the intent and
accomplish  the  purposes  of  this  Agreement  and  the   consummation  of  the
transactions contemplated hereby.

     8.11  Publicity.  Upon the  execution  of this  Agreement  and the  initial
funding by ACS, each party may issue a press release  regarding this transaction
and may file reports as appropriate with the SEC;  provided,  however,  that the
Company  provides a copy of its press  release  and  current  report on Form 8-K
prior to releasing or filing to obtain ACS's  approval of such press release and
current  report.  ACS shall  also  provide a copy of its  press  release  to the
Company for its review.

     8.12 Remedies.  No provision of this Agreement  providing for any remedy to
ACS shall limit any remedy  which would  otherwise be available to ACS at law or
in equity.  Nothing in this  Agreement  shall limit any rights ACS may have with
any applicable  federal or state  securities laws with respect to the investment
contemplated  hereby.  The  Company  acknowledges  that  a  breach  by it of its
obligations  hereunder shall cause  irreparable  harm to ACS.  Accordingly,  the
Company  acknowledges  that  the  remedy  at law for a  material  breach  of its
obligations under this Agreement shall be inadequate and agrees, in the event of
a  breach  or  threatened  breach  by the  Company  of the  provisions  of  this
Agreement,  that ACS shall be  entitled,  in  addition  to all  other  available
remedies,  to an  injunction  restraining  any  breach and  requiring  immediate
compliance,  without the necessity of showing economic loss and without any bond
or other security being required.

     8.13 Final Agreement. This Agreement,  including the Exhibits and Schedules
hereto embody the entire  agreement and  understanding  of the parties hereto in
respect  of the  subject  matter  contained  herein,  and  supersede  all  prior
agreements  and  understandings  among the parties  with respect to such subject
matter. This Agreement does not supersede the Mutual Confidentiality  Agreement,
dated May 11, 2001, between the Company and ACS.

                            [Signatures on next page]









     IN WITNESS  WHEREOF,  the ACS and the Company have caused this Agreement to
be duly executed as of the date first above written.

COMPANY:

MIRAVANT MEDICAL TECHNOLOGIES:

By:
         --------------------------------------------
         Name:  Gary S. Kledzik
         Title:  Chief Executive Officer



PURCHASER:

ADVANCED CARDIOVASCULAR SYSTEMS, INC.

By:
         --------------------------------------------
         Name:  Mark A. Murray
         Title:  Vice President, Finance and Business Development