US3691567A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Prosthetic heart valve having a pair of support rings of dissimilar material
Assignee: HV Corp
•
Filing: 1971-05-07
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Granted: 1972-09-19
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Expires: 1991-05-07
Abstract
Abstract A prosthetic heart valve having an inner support ring of rigid non-thrombogenic material and a malleable metallic outer support ring positioned about the periphery of the inner ring and bent into the immovable clamping relationship therewith. A portion of a tubular fabric member is retained between the two clamped rings, and the remainder of the fabric member is folded into a plurality of layers about the periphery of the outer ring to form a suturing site. Typically, the outer ring carries an outwardly extending flange on one side, which is overlaid by a single thickness of the tubular fabric, to hold the multiple layer suturing site away from the orifice of the inner ring.
Inventors
- 👤 Harry W Cromie
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 22:04
CPC Classifications
A; A61; A61F; A61F2/00; A61F2/02; A61F2/24; A61F2/2409; A61F2/2421; A61F2/2424; Y; Y10; Y10T; Y10T137/00; Y10T137/7722; Y10T137/7837; Y10T137/7904; Y10T137/7908; Y10T137/7909; Y10T137/791
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
14 words
The valve of claim 1 in which said inner ring is made of carbon.
Claim 2
Dependent Claim
19 words
The valve of claim 2 in which said inner ring has an outer coating of an isotropic pyrolytic carbon.
Claim 3
Dependent Claim
64 words
The valve of claim 1 in which said outer ring carries an outwardly extending flange on a side of said ring adjacent said closure member, said flange being overlaid by a single thickness of tubular fabric, to cause fabric immediately adjacent the inner ring to be unsuitable as a suturing site, and to hold the folded tubular fabric portions away from the inner ring.
Claim 4
Dependent Claim
14 words
The valve of claim 4 in which said closure member is a hollow ball.
Claim 5
Dependent Claim
13 words
The valve of claim 5 in which said ball is made of carbon.
Claim 6
Dependent Claim
42 words
The valve of claim 5 in which the inner ring presents a convex curved surface along one dimension to said hollow ball, whereby a line contact between the ball and inner ring is effected when said ball is in flow occluding position.
Claim 7
Dependent Claim
31 words
The valve of claim 7 having a cage for retaining said ball, said cage comprising struts which rest on said protrusion and which are retained between said inner and outer rings.
Claim 8
Dependent Claim
22 words
The valve of claim 8 in which both said inner ring and ball have an outer coating of an isotropic pyrolytic carbon.
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) | 1975-09-19 | 1976-03-20 | 1976-09-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-09-19 | 1980-03-20 | 1980-09-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-09-19 | 1984-03-20 | 1984-09-19 | $7700.00 | Window Closed / Lapsed |