Exhibit 99.1

                                    NMT Medical, Inc.
                                    27 Wormwood Street
                                    Boston, MA 02210-1625
                                    (Nasdaq/NMS:NMTI)





AT THE COMPANY             AT THE FINANCIAL RELATIONS BOARD
-------------------------  --------------------------------
                                      
William J. Knight          General Info:    Paula Schwartz
Chief Financial Officer    Analyst Info:    Brian Gill
(617) 737-0930             Media Info:      Deanne Eagle
                           (212) 661-8030


FOR IMMEDIATE RELEASE
---------------------
July 7, 2000


           NMT MEDICAL ANNOUNCES 2000 ANNUAL MEETING OF STOCKHOLDERS
           ---------------------------------------------------------


BOSTON, MA, JULY 7, 2000 -- NMT Medical, Inc., (Nasdaq/NMS:NMTI) announced today
that its 2000 Annual Meeting of Stockholders will be held on Friday, August 18,
2000, commencing at 9:00 a.m., local time, at the Company's offices at 27
Wormwood Street, Boston, Massachusetts 02210.  Stockholders of record at the
close of business on June 23, 2000 are entitled to notice of and to vote at the
meeting (or any adjournment of the meeting).

Because the 2000 Annual Meeting date has been delayed by more than 30 calendar
days from the date of the Company's 1999 Annual Meeting of Stockholders, which
was held on June 3, 1999, the Company is hereby informing its stockholders of
the 2000 Annual Meeting date in addition to the following new deadlines for
submitting stockholder proposals for the meeting:

 .  stockholder proposals intended to be presented at the meeting and considered
   for inclusion in the proxy statement must be received by the Company at its
   principal offices, 27 Wormwood Street, Boston, Massachusetts 02210 by July
   11, 2000; and

 .  a stockholder of the Company who wishes to present a proposal before the
   meeting but does not wish the proposal to be considered for inclusion in the
   Company's proxy statement and proxy card, must give written notice to the
   Secretary of the Company at the address noted above by July 11, 2000. If a
   stockholder fails to provide timely notice of such a proposal, the proxies
   designated by the Board of Directors of the Company will have discretionary
   authority to vote on the proposal.


The Company expects to mail its Annual Report to Stockholders for the year ended
December 31, 1999, along with the Notice and Proxy Statement of the 2000 Annual
Meeting on or about July 14, 2000.

NMT Medical designs, develops and markets innovative medical devices that
utilize advanced technologies and are delivered by minimally invasive
procedures.  The Company's products are designed to offer alternative approaches
to existing complex treatments, thereby reducing patient trauma, shortening
procedure, hospitalization and recovery times, and lowering overall treatment
costs.  The Company's medical devices include self-expanding stents, vena cava
filters and septal repair devices.  The NMT Neurosciences division serves the
needs of neurosurgeons with a range of implantable and disposable products,
including cerebral spinal fluid shunts, external drainage products, and the
Spetzler(TM) Titanium Aneurysm Clip.


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