US4340977A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Catenary mitral valve replacement
Assignee: Individual
•
Filing: 1980-09-19
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Granted: 1982-07-27
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Expires: 2000-09-19
Abstract
Abstract Mitral heart valve comprising a stent including a circular base and a pair of upstanding diametrically opposed struts, separating a pair of diametrically opposed arcuately shapes depressed reliefs, each such relief being bounded by a smooth curve interconnecting the struts to the circular base. A flexible, durable, biocompatible covering is secured to the stent and provides two equal opposed preset flappably movable valve cusps secured along the smooth curve defining the perimeter of the reliefs. The valve cusps each are preformed and preset so that the perimeter of the biocompatible covering along the free edge of each of the cusps between the tips of each associated strut is so related to the circumference of the circular base that, when the valve is in its forced open position, the cross-sectional area of the exit is substantially equal to the cross-sectional area of the inside of the circular base. When the valve is in its relaxed and natural position, the shape of the cusps is such that the free edges of the cusps sealingly meet in substantially wrinkle-free form at a line of apposition in the plane defined by the tips of the struts and the axis of the valve and follow the approximate shape of a catenary curve.
Inventors
- 👤 Richard T. Brownlee
- 👤 Lawrence N. Scotten
- 👤 David K. Walker
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 19:24
CPC Classifications
A; A61; A61L; A61L27/00; A61L27/36; A61L27/3604; A61F; A61F2/00; A61F2/02; A61F2/24; A61F2/2412; A61L27/14; A61L27/16; A61L27/18; A61L27/3641; A61L27/50; A61L27/507; Y; Y10; Y10S; Y10S623/00; Y10S623/90; Y10T; Y10T137/00; Y10T137/7722; Y10T137/7837; Y10T137/7879; Y10T137/788; Y10T137/7882
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
210 words
A mitral heart valve comprising: a stent including a circular base and a pair of upstanding diametrically opposed struts, separating a pair of diametrically opposed arcuately shaped depressed reliefs, each said said relief being bounded by a smooth curve interconnecting the struts to the circular base; a flexible, durable, biocompatible covering secured to said stent and providing two equal opposed preset flappably movable valve cusps secured along said smooth curve defining the perimeter of said reliefs; said valve cusps each being preformed and preset so that the perimeter of said biocompatible covering along the free edge of each of said cusps between the tips of each associated strut being so related to the circumference of the circular base that, when the valve is in its forced open position, the cross-sectional area of the exit is substantially equal to the cross-sectional area of the inside of said circular base, and, when said valve is in its relaxed and natural closed position, the shape of said cusps is such that the free edges of the cusps sealingly meet in substantially wrinkle-free form at a line of apposition in the plane defined by the tips of said struts and the axis of the valve and follow the approximate shape of a catenary curve.
Claim 2
Dependent Claim
210 words
A mitral heart valve comprising: a stent including a circular base and a pair of upstanding diametrically opposed struts, separating a pair of diametrically opposed arcuately shaped depressed reliefs, each said said relief being bounded by a smooth curve interconnecting the struts to the circular base; a flexible, durable, biocompatible covering secured to said stent and providing two equal opposed preset flappably movable valve cusps secured along said smooth curve defining the perimeter of said reliefs; said valve cusps each being preformed and preset so that the perimeter of said biocompatible covering along the free edge of each of said cusps between the tips of each associated strut being so related to the circumference of the circular base that, when the valve is in its forced open position, the cross-sectional area of the exit is substantially equal to the cross-sectional area of the inside of said circular base, and, when said valve is in its relaxed and natural closed position, the shape of said cusps is such that the free edges of the cusps sealingly meet in substantially wrinkle-free form at a line of apposition in the plane defined by the tips of said struts and the axis of the valve and follow the approximate shape of a catenary curve.
Claim 3
Dependent Claim
11 words
The valve of claim 1 wherein said struts are substantially identical.
Claim 4
Dependent Claim
15 words
The valve of claim 2 wherein said reliefs are symetrically disposed equidistant from said struts.
Claim 5
Dependent Claim
17 words
The valve of claim 2 wherein the free edges of said cusps follow a precise catenary curve.
Claim 6
Dependent Claim
16 words
The valve of claim 4 wherein the valve cusps are formed of pericardium treated with glutaraldehyde.
Claim 7
Dependent Claim
21 words
The valve of claim 5 wherein said cusps of pericardium are secured to each other and to said struts by sutures.
Claim 8
Dependent Claim
17 words
The mitral heart valve of claim 5 wherein said smooth curve interconnecting said struts is a parabola.
Claim 9
Dependent Claim
25 words
The mitral heart valve of claim 1 wherein said stent is formed of a flexible, elastically deformable material, so that said struts may flex slightly.
Claim 10
Dependent Claim
22 words
The mitral heart valve of claim 8 wherein said material is selected from the group consisting of polypropylene or an acetal copolymer.
Claim 11
Dependent Claim
33 words
The mitral heart valve of claim 1 wherein the valve cusps are formed from material selected from the group consisting of bovine, porcine or human fascia lata or dura mater, or of polyurethane.
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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) | 1985-07-26 | 1986-01-25 | 1986-07-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-07-26 | 1990-01-25 | 1990-07-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-07-26 | 1994-01-25 | 1994-07-27 | $7700.00 | Window Closed / Lapsed |