Cardiac valve featuring a parabolic function
First Claim
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1. A cardiac valve comprising a frame and at least two flexible leaflets moveable between an open and closed position;
- wherein the frame comprises an annular portion defining an (XY) plane which, in use, is disposed substantially perpendicular to the blood flow, the frame having first and second ends, one of the ends defining at least two scalloped edge portions separated and defined by at least two posts, wherein said leaflet has first and second lateral edges each attached to a scalloped edge portion of a corresponding post of the frame, wherein the leaflet is formed such that the length of the leaflet between the lateral edges measured at each height (Z) along the lateral edges in an (XY) plane substantially perpendicular to the direction in which the height (Z) is measured is defined by a parabolic function wherein the lengths determined by the parabolic function vary in a substantially linear fashion with the height (Z) when the valve is in a closed position.
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Abstract
There is provided an artificial cardiac or heart valve, more particularly a flexible leaflet heart valve used to replace natural aortic or pulmonary valves of the heart in which the leaflet geometry is defined by a parabolic function and a method of manufacturing said artificial cardiac valves. In addition, there is provided leaflets which have geometry defined by a parabolic function.
42 Citations
8 Claims
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1. A cardiac valve comprising a frame and at least two flexible leaflets moveable between an open and closed position;
- wherein the frame comprises an annular portion defining an (XY) plane which, in use, is disposed substantially perpendicular to the blood flow, the frame having first and second ends, one of the ends defining at least two scalloped edge portions separated and defined by at least two posts, wherein said leaflet has first and second lateral edges each attached to a scalloped edge portion of a corresponding post of the frame, wherein the leaflet is formed such that the length of the leaflet between the lateral edges measured at each height (Z) along the lateral edges in an (XY) plane substantially perpendicular to the direction in which the height (Z) is measured is defined by a parabolic function wherein the lengths determined by the parabolic function vary in a substantially linear fashion with the height (Z) when the valve is in a closed position.
- View Dependent Claims (2)
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3. A cardiac valve prosthesis comprising:
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a frame and at least two flexible leaflets; wherein the frame comprises an annular portion defining an (XY) plane which, in use, is disposed substantially perpendicular to the blood flow, the frame having first and second ends, one of the ends defining at least two scalloped edge portions separated and defined by at least two posts, each leaflet being attached to the frame along a scalloped edge portion and being movable between an open and a closed position; wherein the leaflet is formed such that the length of the leaflet between the lateral edges measured at each height (Z) along the lateral edges in an (XY) plane substantially perpendicular to the direction in which the height (Z) is measured is defined by a parabolic function wherein the lengths determined by the parabolic function vary in a substantially linear fashion with the height (Z) when the valve is in a closed position; each of the at least two leaflets having a blood inlet side, a blood outlet side and at least one free edge, the at least two leaflets being in a closed position when fluid pressure is applied to the outlet side such that the at least one free edge of a first leaflet is urged towards the at least one free edge of a second leaflet, and the at least two leaflets being in an open position when fluid pressure is applied to the blood inlet side of the at least two leaflets such that the at least one free edge of the first leaflet is urged away from the at least one free edge of the second leaflet. - View Dependent Claims (4, 5, 6, 7, 8)
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Specification