US4038702A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electrochemical and chemical methods for production of non-thrombogenic metal heart valves
Assignee: Individual
•
Filing: 1973-09-21
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Granted: 1977-08-02
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Expires: 1993-09-21
Abstract
Abstract A method of improving the operation of metal heart valves according to which the surfaces of the heart valves are treated to render more negative the electrochemical potential which the valve part will exhibit in blood or a blood-like fluid and to minimize surface non-homogenities. The surface is treated to obtain more particularly a negative surface potential which is generally homogeneous and more negative than + 100 mv/NHE by chemical polishing, electrochemical polishing or cathode cleaning.
Inventors
- 👤 Philip Nicholas Sawyer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 13:45
CPC Classifications
A; A61; A61F; A61F2/00; A61F2/0077; Y; Y10; Y10S; Y10S623/00; Y10S623/92; Y10S623/921
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
61 words
A prosthetic device including a metal structure having a metal surface, said metal surface being electrolytically treated to render more negative and homogeneous the electrochemical surface charge which the surface will exhibit in blood or a bloodlike fluid, said surface having thereon no more than two foreign particles not exceeding 0.5 microns in maximum diameter per 25 square microns of surface.
Claim 2
Dependent Claim
61 words
A prosthetic device including a metal structure having a metal surface, said metal surface being electrolytically treated to render more negative and homogeneous the electrochemical surface charge which the surface will exhibit in blood or a bloodlike fluid, said surface having thereon no more than two foreign particles not exceeding 0.5 microns in maximum diameter per 25 square microns of surface.
References Cited (Backward Citations)
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US3491756A
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US3609768A
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-08-01 | 1981-01-31 | 1981-08-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-08-01 | 1985-01-31 | 1985-08-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-08-01 | 1989-01-31 | 1989-08-02 | $7700.00 | Window Closed / Lapsed |