EXHIBIT 99.1 - PRESS RELEASE

                       DIOMED EXPANDS DISTRIBUTION NETWORK
             Executes Sales and Marketing Agreement with Med1Online

ANDOVER,  MA, June 30, 2005 --- Diomed  Holdings,  Inc.  (AMEX:  DIO - News),  a
leading  developer  and marketer of  minimally  invasive  medical  technologies,
including its patented  EndoVenous Laser Treatment (EVLT(R)) for varicose veins,
today announced,  that it has entered into an exclusive  distribution  agreement
with Colorado-based Med1 Online, Inc., one of the leading online distributors of
capital medical equipment in the United States.

"We believe that Diomed's  strategic  agreement with  Med1Online will expand our
market reach and help us accelerate revenue growth for EVLT(R)," stated James A.
Wylie,  President  and Chief  Executive  Officer of Diomed  Holdings,  Inc. "The
execution  of this  distribution  agreement  creates a powerful  combination  of
Diomed's patented  technology and Med1Online's  novel  distribution  approach to
bring EVLT(R) to currently underserved market segments."

Under the terms of the three-year renewable distribution  agreement,  Med1Online
acquired exclusive  distribution  rights to market Diomed's EVLT(R) product line
to the OB/GYN  and  plastic  surgery  physician  market  segments,  providing  a
superior adjunct technology to Toshiba America Medical Systems' Nemio ultrasound
product, recently secured by Med1Online in a similar distribution agreement.

"We are very  pleased  to be  partnering  with  Diomed to expand  this  exciting
technology,"  stated  Scott  Carson,  President  of  Med1Online.  "This  product
partnership  further  strengthens our position in the OB/GYN and plastic surgery
markets while  offering  one-stop  shopping for all of our  customers'  vascular
product  needs.  Collaboration  with  market  leaders in a  specific  segment is
critical to driving  rapid  growth in that  market.  Diomed's  clear  leadership
position  in the  endovenous  laser  treatment  of  varicose  veins  should only
accelerate, with their operational focus on EVLT(R) and their solid intellectual
property position."

"This is the first in a planned series of new sales and marketing initiatives by
Diomed," added Mr. Wylie.  "Med1Online will have an immediate positive impact on
the business and we expect them to be a  significant  contributor  to our future
growth."

About Diomed

Diomed develops and  commercializes  minimally  invasive medical procedures that
use its proprietary laser technologies and disposable  products.  Diomed focuses
on EndoVenous  Laser  Treatment  (EVLT(R)) for use in varicose vein  treatments,
photodynamic therapy (PDT) for use in cancer treatments,  and dental and general
surgical applications.  The EVLT(R) procedure and the Company's related products
were cleared by the United States FDA in January of 2002.  Along with lasers and
single-use  procedure kits for EVLT(R),  the Company provides its customers with
state of the art physician training and practice development support. Additional
information is available on the Company's  website,  www.evlt.com.  EVLT(R) is a
registered trademark of Diomed, Inc., Andover, MA.



Safe Harbor  statements under the Private  Securities  Litigation  Reform Act of
1995:  Statements in this news release looking forward in time involve risks and
uncertainties,  including  the risks  associated  with  trends  in the  products
markets,  reliance on third party  distributors in various countries outside the
United States, reoccurring orders under OEM contracts,  market acceptance risks,
technical  development risks and other risk factors.  These statements relate to
our future plans, objectives,  expectations and intentions. These statements may
be identified by the use of words such as "may," "will," "should,"  "potential,"
"expects,"   "anticipates,"   "intends,"   "plans,"   "believes"   and   similar
expressions. These statements are based on our current beliefs, expectations and
assumptions and are subject to a number of risks and  uncertainties.  Our actual
results could differ  materially from those discussed in these  statements.  Our
Annual Report on Form SEC 10-KSB (the "Annual Report")  contains a discussion of
certain of the risks and uncertainties that affect our business. We refer you to
the "Risk  Factors" on pages 22 through 37 of the Annual Report for a discussion
of certain risks,  including  those relating to our business as a medical device
company without a significant  operating record and with operating  losses,  our
risks relating to our  commercialization  of our current and future products and
applications and risks relating to our common stock and its market value. Diomed
disclaims any obligation or duty to update or correct any of its forward-looking
statements.

For more information contact:

Diomed Holdings, Inc.
Christopher J. Geberth
Vice President Finance
877-434-6633 or 978-824-1816
investor-relations@diomedinc.com

or

Investor Relations:
Cameron Associates
Al Palombo, 212-554-5488
al@cameronassoc.com