Heart valve prosthesis and method for the production thereof
First Claim
1. A heart valve prosthesis made from a flat strip piece of a stabilized biological membrane which is folded along at least one folding line to form opposed layers and attached to a flat flexible non-biological base material to form at least one leaflet.
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Abstract
A flexible non-stented heart valve prosthesis made from a flat piece of a stabilized biological membrane. The membrane is folded along one or more folding lines and attached to a flat flexible non-biological base material so that one or more leaflets are formed. Preferably the membrane is pericardium and is attached by machine stitching to a woven polymeric base material. Different valve types including ventricular outflow patches and three-leaflet valves such as aortic valves and methods for their production are described.
The aortic valve is preferably made from three separate leaflets provided with narrow base materials serving as attachment margins which are stitched together in a manner to form a three-leaflet valve.
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Citations
20 Claims
- 1. A heart valve prosthesis made from a flat strip piece of a stabilized biological membrane which is folded along at least one folding line to form opposed layers and attached to a flat flexible non-biological base material to form at least one leaflet.
- 16. A method of producing a heart valve prosthesis comprising the steps of folding a flat strip piece of biological membrane along at least one folding line to form opposed layers and stitching the strip on a flat flexible non-biological base material to form at least one leaflet.
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18. A method of producing an aortic valve prosthesis comprising the steps of folding a strip of a biological membrane along a folding line, stitching a tongue-shaped attachment margin of a tape-shaped flexible non-biological material to either side of the membrane, removing the excess portion of the membrane, stitching the obtained tongue-shaped leaflet together with two leaflets produced in the same manner along a section of the respective attachment margins to form a three-leaflet valve.
Specification