LOAN EXTENSION AND MODIFICATION AGREEMENT
                           (REVOLVING LINE OF CREDIT)

         In consideration  of the promises  contained in this Loan Extension and
Modification  Agreement (the "Agreement"),  MERIT MEDICAL SYSTEMS,  INC., a Utah
corporation  ("Merit  Medical"),  and ZIONS  FIRST  NATIONAL  BANK,  a  national
association  ("Zions Bank"), each referred to as a "Party" and both collectively
referred to as the "Parties" to this Agreement, agree as follows:

         1. Merit Medical has a revolving  line of credit (the "Line of Credit")
with  Zions  Bank in the  current  maximum  principal  amount of  $8,500,000.00,
evidenced and governed by the following  documents,  among others  (collectively
the "Loan Documents"):

                  A.       Loan Agreement, dated October 10, 1995 (the "Loan
                           Agreement");
                  B.       Promissory  Note,  dated  October  10,  1995,  in the
                           original  maximum  principal  amount of $8,500,000.00
                           (the "Note");
                  C.       Trust Deed with  Assignment  of Rents,  dated October
                           10, 1995,  and recorded on October 18, 1995, as Entry
                           No.  6192795 in Book 7251  beginning  at Page 0903 of
                           the official records of the Salt Lake County Recorder
                           (the "Trust Deed"); and
                  D.       Security Agreement, dated October 10, 1995,
                           whereby Merit Medical granted to Zions Bank a
                           security interest in, among other things, all of
                           its inventory, accounts, general intangibles
                           (including without limitation certain patents
                           described in the Security Agreement), equipment,
                           furnishings and fixtures, all as more particularly
                           described in the Security Agreement (the "Security
                           Agreement").

         2. The Line of Credit  matured on September 1, 1997,  on which date all
amounts owing on the Line of Credit became immediately due and payable.

         3. Merit  Medical  failed to pay off the Line of Credit on September 1,
1997, as agreed, and now have requested Zions Bank to extend the maturity of the
Line of Credit  until  October 1,  1998,  and to modify the terms of the Line of
Credit by: (a) increasing the maximum  principal amount of the Line of Credit to
$10,500.00;  (b) reducing the interest rate by .25%;  (c) increasing the maximum
amount of raw materials and finished  goods used to calculate the  limitation on
advances  under the Line of Credit  from  $3,000,000.00  to  $3,500,000.00;  (d)
increasing  the ratio of total  liabilities  to tangible  net worth from [1.0 to
1.0]  to  [1.10  to  1.0];  and  (e)  increasing  the  minimum  working  capital
requirement from $7,000,000.00 to $9,000,000.00. Zions Bank is willing to do so,
subject  to the  terms and  conditions  of this  Agreement,  which  include  not
interrupting or otherwise  adversely affecting the priority of Zions Bank's lien
and security  interests  created  under and  evidenced by the Trust Deed and the
Security Agreement.
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                             Modification Agreement
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         4. The Parties represent and warrant to each other that, in deciding to
enter into this Agreement, they each:

                  A.       made their own due diligence investigation and
                           evaluation;
                  B.       had all of the information they needed;
                  C.       did not rely on any statements, acts or omissions
                           except as expressly set forth in this Agreement;
                  D.       were not acting under any duress, compulsion or
                           undue influence; and
                  E.       were (or had the opportunity to be) advised by
                           independent legal counsel.

         5. By this  Agreement,  the Line of Credit and the Loan  Documents  are
modified as follows:

                  A.       The  maturity  date of the Line of Credit is extended
                           from  September  1, 1997,  to  October  1, 1998.  All
                           amounts  owing on the  Line of  Credit  shall  become
                           immediately due and payable on October 1, 1998.

                  B.       The maximum principal amount of the Line of Credit is
                           increased from $8,500,000.00 to $10,500,000.00.

                  C.       The  interest  rates  specified  in the Note shall be
                           reduced  by .25%,  or in other  words from .25% above
                           the Base  Rate (as  defined  in the Note) to the Base
                           Rate,  and from 3.10 above the LIBOR Rate (as defined
                           in the Note) to 2.85% above the LIBOR Rate.

                  D.       The  maximum  amount of raw  materials  and  finished
                           goods used to calculate  the  limitation  on advances
                           under  the  Line  of  Credit   are   increased   from
                           $3,000,000.00 to $3,500,000.00.

                  E.       Effective  beginning with the calendar  quarter which
                           ends March 31,  1998,  the  allowable  ratio of total
                           liabilities  to tangible net worth is increased  from
                           [1.0 to 1.0] to [1.10 to 1.0].

                  F.       The minimum  working  capital  which Merit Medical is
                           required to  maintain  during the term of the Line of
                           Credit   is   increased   from    $7,000,000.00    to
                           $9,000,000.00.

         6.  Contemporaneous  with the execution and delivery of this Agreement,
Merit Medical shall execute and deliver to Zions Bank a Supplemental Trust Deed,

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                             Modification Agreement
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in a form  acceptable to Zions Bank,  whereby the Trust Deed is  supplemented to
state the increased maximum principal amount of the Line of Credit.

         7. Except as expressly modified by this Agreement, all of the terms and
conditions  of the Line of Credit and the Loan  Documents  shall  remain in full
force and effect,  and, as modified by this Agreement,  the Line of Credit shall
continue to be secured as provided in the Loan Documents.

         8. Zions Bank has incurred  approximately  $675.00 in attorney fees and
expenses in connection with this Agreement and a Loan Assumption Agreement to be
executed  and  delivered  at the  same  time as  this  Agreement,  which  amount
(together with any additional attorney fees and expenses incurred by Zions Bank)
shall be paid by  Merit  Medical  contemporaneous  with  the  execution  of this
Agreement.  Additionally,  contemporaneous with the execution of this Agreement,
Merit Medical shall pay to Zions Bank a loan  modification  and extension fee of
$26,250.00.

         9.  Except for express  contractual  obligations  of Zions Bank,  Merit
Medical  forever  releases  Zions  Bank and all of its  parent,  subsidiary  and
affiliated  corporations  and entities,  past,  present and future,  and each of
them,  as  well as  their  respective  partners,  directors,  officers,  agents,
servants,  employees and attorneys,  past, present and future, and each of them,
from any and all claims,  demands,  damages,  losses,  liabilities and causes of
action, of whatever kind or nature, whether known or unknown,  whether suspected
or unsuspected, and whether related, directly or indirectly, or wholly unrelated
to the subject matter of this Agreement.

         10.      ARBITRATION DISCLOSURES:

                  A.       ARBITRATION IS FINAL AND BINDING ON THE PARTIES
                           AND SUBJECT TO ONLY VERY LIMITED REVIEW BY A
                           COURT.

                  B.       IN ARBITRATION THE PARTIES ARE WAIVING THEIR RIGHT
                           TO LITIGATE IN COURT, INCLUDING THEIR RIGHT TO A
                           JURY TRIAL.

                  C.       DISCOVERY IN ARBITRATION IS MORE LIMITED THAN
                           DISCOVERY IN COURT.

                  D.       ARBITRATORS  ARE  NOT  REQUIRED  TO  INCLUDE  FACTUAL
                           FINDINGS  OR LEGAL  REASONING  IN THEIR  AWARDS.  THE
                           RIGHT TO APPEAL OR SEEK  MODIFICATION OF ARBITRATORS'
                           RULINGS IS VERY LIMITED.

                  E.       A PANEL OF ARBITRATORS MIGHT INCLUDE AN ARBITRATOR
                           WHO IS OR WAS AFFILIATED WITH THE BANKING
                           INDUSTRY.



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                             Modification Agreement
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                  F.       IF YOU HAVE QUESTIONS ABOUT ARBITRATION, CONSULT
                           YOUR ATTORNEY OR THE AMERICAN ARBITRATION
                           ASSOCIATION.

         ARBITRATION AGREEMENT

                  G.       Any claim or controversy ("Dispute") between or
                           among the Parties, including but not limited to
                           Disputes arising out of or relating to the Line of
                           Credit, the Loan Documents, this Agreement, or any
                           agreement, document, obligation or transaction
                           contemplated by this Agreement, this paragraph 10
                           (the "Arbitration Agreement"), or any related
                           agreements or instruments relating hereto or
                           delivered in connection herewith (the "Related
                           Documents"), and including but not limited to a
                           Dispute based on or arising from an alleged tort,
                           shall at the request of any Party be resolved by
                           binding arbitration in accordance with the
                           applicable arbitration rules of the American
                           Arbitration Association ("the Administrator").
                           The provisions of this Arbitration Agreement shall
                           survive any termination, amendment, or expiration
                           of this Agreement, the Loan Documents or the
                           Related Documents.

                  H.       The arbitration proceedings shall be conducted in
                           Salt Lake City, Utah, at a place to be determined
                           by the Administrator.  The Administrator and the
                           arbitrator(s) shall have the authority to the
                           extent practicable to take any action to require
                           the arbitration proceeding to be completed and the
                           arbitrator(s)' award issued within one-hundred-
                           fifty (150) days of the filing of the Dispute with
                           the Administrator.  The arbitrator(s) shall have
                           the authority to impose sanctions on any Party
                           that fails to comply with time periods imposed by
                           the Administrator or the arbitrator(s), including
                           the sanction of summarily dismissing any Dispute
                           or defense with prejudice.  The arbitrator(s)
                           shall have the authority to resolve any Dispute
                           regarding the terms of this Agreement, this
                           Arbitration Agreement, the Loan Documents or the
                           Related Documents, including any claim or
                           controversy regarding the arbitrability of any
                           Dispute.  All limitations periods applicable to
                           any Dispute or defense, whether by statute or
                           agreement, shall apply to any arbitration
                           proceeding hereunder and the arbitrator(s) shall
                           have the authority to decide whether any Dispute
                           or defense is barred by a limitations period and,
                           if so, to summarily dismiss any Dispute or defense
                           on that basis.  The doctrines of compulsory
                           counterclaim, res judicata, and collateral
                           estoppel shall apply to any arbitration proceeding
                           hereunder so that a Party must state as a

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                             Modification Agreement
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                           counterclaim in the arbitration  proceeding any claim
                           or controversy which arises out of the transaction or
                           occurrence that is the subject matter of the Dispute.
                           The   arbitrator(s)   may   in   the   arbitrator(s)'
                           discretion  and at the  request  of  any  Party:  (1)
                           consolidate  in a single  arbitration  proceeding any
                           other claim or  controversy  involving  another Party
                           that is  substantially  related to the Dispute  where
                           that other  Party is bound by an  arbitration  clause
                           with  the  Lender,  such  as  borrowers,  guarantors,
                           sureties,  and owners of collateral;  (2) consolidate
                           in a single arbitration proceeding any other claim or
                           controversy  that  is  substantially  similar  to the
                           Dispute;  and  (3)  administer  multiple  arbitration
                           claims  or   controversies   as  class   actions   in
                           accordance  with  the  provisions  of  Rule 23 of the
                           Federal Rules of Civil Procedure.

                  I.       The arbitrator(s) shall be selected in accordance
                           with the rules of the Administrator from panels
                           maintained by the Administrator.  A single
                           arbitrator shall be knowledgeable in the subject
                           matter of the Dispute.  Where three arbitrators
                           conduct an arbitration proceeding, the Dispute
                           shall be decided by a majority vote of the three
                           arbitrators, at least one of whom must be
                           knowledgeable in the subject matter of the Dispute
                           and at least one of whom must be a practicing
                           attorney.  The arbitrator(s) shall award recovery
                           of all costs and fees (including attorneys' fees
                           and costs, arbitration administration fees and
                           costs, and arbitrator(s)' fees).  The
                           arbitrator(s), either during the pendency of the
                           arbitration proceeding or as part of the
                           arbitration award, also may grant provisional or
                           ancillary remedies including but not limited to
                           injunctive relief, foreclosure, sequestration,
                           attachment, replevin, garnishment, or the
                           appointment of a receiver.

                  J.       Judgment upon an arbitration award may be entered
                           in any court having jurisdiction, subject to the
                           following limitation:   the arbitration award is
                           binding upon the parties only if the amount does
                           not exceed four million dollars ($4,000,000.00);
                           if the award exceeds that limit, any Party may
                           demand the right to a court trial.  Such a demand
                           must be filed with the Administrator within thirty
                           (30) days following the date of the arbitration
                           award; if such a demand is not made within that
                           time period, the amount of the arbitration award
                           shall be binding.  The computation of the total
                           amount of an arbitration award shall include
                           amounts awarded for attorneys' fees and costs,
                           arbitration administration fees and costs, and
                           arbitrator(s)' fees.

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                             Modification Agreement
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                  K.       No provision of this Arbitration Agreement, nor
                           the exercise of any rights hereunder, shall limit
                           the right of any Party to: (1) judicially or non-
                           judicially foreclose against any real or personal
                           property collateral or other security; (2)
                           exercise self-help remedies, including but not
                           limited to repossession and setoff rights; or (3)
                           obtain from a court having jurisdiction thereover
                           any provisional or ancillary remedies including
                           but not limited to injunctive relief, foreclosure,
                           sequestration, attachment, replevin, garnishment,
                           or the appointment of a receiver.  Such rights can
                           be exercised at any time, before initiation of or
                           during an arbitration proceeding, except to the
                           extent such action is contrary to the arbitration
                           award.  The exercise of such rights shall not
                           constitute a waiver of the right to submit any
                           Dispute to arbitration, and any claim or
                           controversy related to the exercise of such rights
                           shall be a Dispute to be resolved under the
                           provisions of this Arbitration Agreement.

                  L.       Notwithstanding the applicability of any other law to
                           this Agreement,  the Loan Documents,  the Arbitration
                           Agreement,  or the Related Documents between or among
                           the Parties,  the Federal  Arbitration  Act, 9 U.S.C.
                           ss. 1 et seq.,  shall apply to the  construction  and
                           interpretation of this Arbitration Agreement.

         11.  This  Agreement  and  the  Loan  Documents,  as  modified  by this
Agreement,  constitute the entire agreement  between the Parties with respect to
the  Line of  Credit,  and may not be  altered  or  amended  except  by  written
agreement  signed by both of the Parties.  PURSUANT TO UTAH CODE SECTION 25-5-4,
MERIT  MEDICAL  IS  NOTIFIED  THAT THIS  AGREEMENT  AND THE LOAN  DOCUMENTS,  AS
MODIFIED BY THIS AGREEMENT, ARE A FINAL EXPRESSION OF THE AGREEMENTS BETWEEN THE
PARTIES, AND MAY NOT BE CONTRADICTED BY EVIDENCE OF ANY ALLEGED ORAL AGREEMENT.

         12.  This  Agreement  is made  pursuant  to and shall be  construed  in
accordance with the laws of the State of Utah.

         DATED:   10 October  , 1997.

                                                     MERIT MEDICAL SYSTEMS, INC.

                                                     By: /s/ Kent Stanger

                                                     Title: CFO, Secretary

                                                     ZIONS FIRST NATIONAL BANK

                                                     By: /s/Grant P. 

                                                     Title: Vice President

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