IPC분류정보
국가/구분 |
United States(US) Patent
등록
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국제특허분류(IPC7판) |
|
출원번호 |
US-0564206
(1983-12-22)
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우선권정보 |
CA-0431115 (1983-06-23) |
발명자
/ 주소 |
- Walker David K. (1576 Cedarglen Rd. Victoria
- British Columbia CAX V8N 2B2) Brownlee Richard T. (Suite 101
- 1780 Fort Street Victoria
- British Columbia CAX V8R 1J5) Hewgill Denton E. (4012 Morning
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인용정보 |
피인용 횟수 :
40 인용 특허 :
0 |
초록
▼
A novel bileaflet mitral heart valve is provided herein, which in two alternative embodiments may have symmetrical leaflets or assymmetrical leaflets. It has a stent including a circular base and a pair of upstanding struts separating a pair of arcuately shaped, depressed, reliefs, each such relief
A novel bileaflet mitral heart valve is provided herein, which in two alternative embodiments may have symmetrical leaflets or assymmetrical leaflets. It has a stent including a circular base and a pair of upstanding struts separating a pair of arcuately shaped, depressed, reliefs, each such relief being bounded by a smooth curve interconnecting the struts to the circular base. A flexible, durable, biocompatible, e.g. a pericardial, covering is secured to the stent and provides two opposed molded, flexible, flappably-movable, valve leaflets secured along the smooth curve defining the upper perimeter of the reliefs. These valve leaflets each are preformed and molded so that the free margin of the valve leaflets along the free edge of each of the leaflets between the tips of the struts is related to the circumference of the circular base such that, when the valve is in the open position, the cross-sectional area is substantially equal to the inside cross-sectional area of the circular base, and when the valve is in its relaxed and natural position, the free edges of the leaflets drop down and sealingy meet in substantially wrinkle-free form at a curve of apposition, preferably in the plane defined by the tip of the struts and the axis of the valve to provide symmetrical leaflets, and, in one embodiment, may follow the approximate shape of a catenary curve. The two leaflets may thus approach the configuration of the natural human mitral valve and the shape of the leaflets in that closed position approximate that of a surface formed by two coapting bubbles under pressure.
대표청구항
▼
A mitral heart valve comprising: a stent including a circular base and a pair of upstanding struts separating a pair of arcuately-shaped, depressed, reliefs, each said relief being bounded by a smooth curve interconnecting said struts to said circular base; a flexible, durable, biocompatible coverin
A mitral heart valve comprising: a stent including a circular base and a pair of upstanding struts separating a pair of arcuately-shaped, depressed, reliefs, each said relief being bounded by a smooth curve interconnecting said struts to said circular base; a flexible, durable, biocompatible covering secured to said stent and providing two opposed, moulded, flexible, flappably-movable valve leaflets secured along a smooth curve defining the upper perimeter of the reliefs; said valve leaflets each being preformed and moulded so that the free margin of said biocompatible leaflets along the free edge of each of said leaflets between the tips of said struts is related to the circumference of said circular base such that, when said valve is in its open position, the cross-sectional area 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 position, the free edges of said leaflets drop down and sealingly meet in substantially wrinkle-free form at a curve of apposition, the shape of said leaflets in that closed position approximating that of a surface formed by two coapting bubbles under pressure, the shape of said surface formed by said two coapting bubbles under pressure being defined by the following five simultaneous equations: [Figure] (1) [Figure] (2) ∫Du(x,y)dslD∫u(x,y)dxdy [Figure] (3) [Figure] 3uy2=1+ux2atx=0. (4) u(x,y)=xsinax,yeD. (5) wherein: [Figure] a
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