Method for machining preformed plastic film by separation...

Details Method for machining preformed plastic film by separation... Method for machining preformed plastic film by separation...

B - Operations, Transporting

29

C

B29C 59/16 (2006.01) A61F 2/24 (2006.01) B29C 35/08 (2006.01)

Patent

CA 2315158

The invention relates to a method for producing plastic film having a predefinable outline and/or even or woven thickness, by machining preformed plastic film by separation and/or ablation. Said method is used especially for manufacturing flexible flaps for artificial heart valves. To produce a film having local variations in thickness and smooth edges where the piece of film has been cut the invention provides. for the plastic film to be separated and/or for specific areas to be ablated to the desired thickness by means of a laser beam.

L'invention concerne un procédé pour produire des films de matière plastique présentant un contour prédéfinissable et/ou une répartition d'épaisseur uniforme ou non, par usinage de films de matière plastique préformés, par découpage et/ou ablation. Ce procédé est mis en oeuvre notamment pour produire des valves souples destinées à des valvules cardiaques. L'invention vise à permettre l'obtention d'un film présentant des variations locales d'épaisseur et la production d'un fragment de film découpé présentant une arête d'extrémité lisse. A cet effet, il est prévu de découper le film de matière plastique et/ou de procéder à l'ablation de certaines zones du film, au moyen d'un faisceau laser, le long du contour prédéterminé, jusqu'à obtention de l'épaisseur voulue.

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