US4556996A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Heart valve
Assignee: Individual
•
Filing: 1983-08-04
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Granted: 1985-12-10
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Expires: 2003-08-04
Abstract
Abstract An artificial heart valve includes tapering flaps which are suspended to pivot between open and closed positions.
Inventors
- 👤 Robert S. Wallace
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 15:11
CPC Classifications
A; A61; A61F; A61F2/00; A61F2/02; A61F2/24; A61F2/2412; A61F2/2403; A61F2/2409
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
184 words
An artificial heart valve comprising: (a) a circular annular support having a central axis, said annular support having an imaginary bisecting plane of symmetry perpendicular to said axis, (b) multiple triangular valve flaps integrally molded with said flaps and support, (c) hinges having a thickness less than that of either the flaps or annular support and joining the flaps to the annular support on a first side of said symmetry plane, (d) each of said flaps having an unbiased as molded position in which each of said triangular flaps taper substantially to a point on said axis which is on a second side of said symmetry plane, each of said flaps further including a plastic core of resiliently bendable molded material which acts to urge the flaps toward their as molded position, (e) said valve in use being repositioned by inverting said flaps through said plane of symmetry so that they are biased to a first closed position, said flaps further being capable of opening to a second position when the pressure across the valve is sufficient to overcome the biasing of said flaps.
Claim 2
Dependent Claim
184 words
An artificial heart valve comprising: (a) a circular annular support having a central axis, said annular support having an imaginary bisecting plane of symmetry perpendicular to said axis, (b) multiple triangular valve flaps integrally molded with said flaps and support, (c) hinges having a thickness less than that of either the flaps or annular support and joining the flaps to the annular support on a first side of said symmetry plane, (d) each of said flaps having an unbiased as molded position in which each of said triangular flaps taper substantially to a point on said axis which is on a second side of said symmetry plane, each of said flaps further including a plastic core of resiliently bendable molded material which acts to urge the flaps toward their as molded position, (e) said valve in use being repositioned by inverting said flaps through said plane of symmetry so that they are biased to a first closed position, said flaps further being capable of opening to a second position when the pressure across the valve is sufficient to overcome the biasing of said flaps.
Claim 3
Dependent Claim
17 words
The combination of claim 1 wherein said annular support includes a non-elastomeric core ring to retain sutures.
Claim 4
Dependent Claim
14 words
The combination of claim 1 wherein there are at least four of said flaps.
Claim 5
Dependent Claim
41 words
The combination of claim 1 wherein said annular support includes a first plastic core ring, a second core ring on said first core ring and to which sutures are connectible, and an elastomer ring about said first and second core rings.
Claim 6
Dependent Claim
12 words
The combination of claim 4 wherein said elastomer consists of silicone rubber.
Claim 7
Dependent Claim
12 words
The combination of claim 1 in which there are five like flaps.
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) | 1988-12-09 | 1989-06-10 | 1989-12-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-12-09 | 1993-06-10 | 1993-12-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-12-09 | 1997-06-10 | 1997-12-10 | $7700.00 | Window Closed / Lapsed |