US4374669A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Cardiovascular prosthetic devices and implants with porous systems
Assignee: Pacesetter Inc
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Filing: 1979-11-19
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Granted: 1983-02-22
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Expires: 1999-11-19
Abstract
Abstract Novel cardiovascular prosthetic devices or implants having many useful cardiovascular applications comprise a porous surface and a network of interconnected interstitial pores below the surface in fluid flow communication with the surface pores. Tissue forms a smooth thin adherent coating of self-determining thickness on the porous surface making it resistant to the formation of the blood clots normally associated with the presence of foreign bodies in the blood stream. The device has particular utility in heart valves, pacemaker electrodes, blood pumps, blood stream filters, an artificial pancreas, vascular access tubes, small and large bore vascular grafts, blood pump diaphragms and vascular and intracardiac patches.
Inventors
- 👤 David C. Mac Gregor
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 00:36
CPC Classifications
A; A61; A61N; A61N1/00; A61N1/02; A61N1/04; A61N1/05; A61N1/056; A61N1/0565; A61F; A61F2/00; A61F2/0077; A61F2/02; A61F2/04; A61F2/06; A61L; A61L27/00; A61L27/14; A61L27/18; A61L27/28; A61L27/34; A61L27/50; A61L27/56; A61L33/00; A61L33/02; A61L33/022; Y; Y10; Y10T; Y10T428/00; Y10T428/12; Y10T428/12014; Y10T428/12028; Y10T428/12042
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
154 words
A method of formation of a composite structure in cardiovascular devices or implants constructed of rigid metal inert to blood to inhibit the incidence of thrombo-embolism and consisting of a rigid coherent metal substrate and a porous coating formed on and adhered to blood-engaging surfaces of said substrate consisting of a plurality of small discrete particles bonded together at their points of contact with each other in at least two layers to define a plurality of connected interstitial pores uniformly distributed throughout the coating, said method comprising: roughening the coherent metal substrate surfaces desired to be coated, forming a viscous self-supporting coating of a plurality of layers of at least one metal or at least one thermally-decomposable metal compound particles adhesively bound together and to the substrate, drying said adhesive to provide a preform on said substrate; and sintering said preform to cause interconnection of metal particles to each other and to said substrate.
Claim 2
Independent Claim
154 words
A method of formation of a composite structure in cardiovascular devices or implants constructed of rigid metal inert to blood to inhibit the incidence of thrombo-embolism and consisting of a rigid coherent metal substrate and a porous coating formed on and adhered to blood-engaging surfaces of said substrate consisting of a plurality of small discrete particles bonded together at their points of contact with each other in at least two layers to define a plurality of connected interstitial pores uniformly distributed throughout the coating, said method comprising: roughening the coherent metal substrate surfaces desired to be coated, forming a viscous self-supporting coating of a plurality of layers of at least one metal or at least one thermally-decomposable metal compound particles adhesively bound together and to the substrate, drying said adhesive to provide a preform on said substrate; and sintering said preform to cause interconnection of metal particles to each other and to said substrate.
Claim 3
Dependent Claim
54 words
The method of claim 1 wherein said metal compound particles are titanium hydride particles, said sintering is effected at a temperature at least sufficient to cause thermal decomposition of said titanium hydride particles and form interconnected metal particles in said coating and hydrogen released in said thermal decomposition is removed from a sintering zone.
Claim 4
Dependent Claim
23 words
The method of claim 2 wherein said substrate is constructed of titanium and titanium hydride particles have a particle size of -325 mesh.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1986-02-21 | 1986-08-23 | 1987-02-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-02-21 | 1990-08-23 | 1991-02-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-02-21 | 1994-08-23 | 1995-02-22 | $7700.00 | Window Closed / Lapsed |