Patent ID: 6528006
Filing Date: 2003-03-04
Classification: A61F,B29C

Abstract:
A method of making single or multilayer plastic film with a predetermined contour and/or a uniform or nonuniform thickness distribution by separating and/or ablating machining of prefabricated plastic film, in the production of flexible cusps for artificial heart valves, wherein the prefabricated plastic film is separated along the predetermined contour by means of a laser beam bundle and/or is areawise ablated to the respective desired thickness measurement by means of a laser beam bundle, the single or multilayer plastic film is made from polyurethane by injection molding, deep drawing, immersion and/or spraying on a form and then is ablated areawise and/or cut out and, before ablating machining, the prefabricated plastic film is coated by means of a laser beam bundle with a protective layer which is removed after ablating machining, wherein the protective layer is comprised of water soluble material which is washed away after the ablating machining and is biocompatible.