Polymer valve prostheses by dip coating

Details Polymer valve prostheses by dip coating Polymer valve prostheses by dip coating

B - Operations, Transporting

29

C

B29C 33/42 (2006.01) A61F 2/24 (2006.01) B29C 41/14 (2006.01)

Patent

CA 2426643

Improved dip coating methods and mandrels for forming polymer leaflets and valve prostheses are disclosed. The mandrel (300) has a top surface and an outer surface comprising a plurality of ridges (306) and contoured surfaces (310) extending to the ridges (306). An edge (312) on the mandrel (300) separates the top surface (314) and the contoured surfaces (310), with the mandrel edge (312) corresponding to the free edge of the leaflet. In preferred embodiments, the edge (312) separating the top surface (314) from the contoured surfaces (310) is sharp. The polymer formed on the top surface (314) can be efficiently separated from the remaining portions of the polymer structure to form the free edges of the leaflets.

L'invention concerne des procédés de revêtement au trempé améliorés et des mandrins permettant de former des valves en polymère et des prothèses de valvule cardiaque. Un mandrin comprend une surface supérieure, une surface extérieure dotée d'une pluralité de nervures, et des surfaces profilées s'étendant vers lesdites nervures. Un bord de mandrin sépare la surface supérieure et les surfaces profilées, ledit bord de mandrin correspondant à un bord libre de valve. Selon des modes de réalisation préférés, le bord séparant la surface supérieure des surfaces profilées est acéré. Le polymère formé sur la surface supérieure peut être efficacement séparé des parties restantes de la structure en polymère afin de former les bords libres des valves.

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