Method of forming a tubular membrane on a structural frame

Details Method of forming a tubular membrane on a structural frame Method of forming a tubular membrane on a structural frame

A - Human Necessities

61

F

A61F 2/06 (2006.01) A61F 2/24 (2006.01)

Patent

CA 2512029

The present invention relates to a medical device and method of forming the medical device. In particular, the present invention relates to a medical device having a tubular membrane structure over a radially expandable structural frame, and to a method of forming the tubular membrane on the radially expandable structural frame. In one aspect, a structural frame is placed over a spinning mandrel and a fiber is electro-statically spun over at least a portion of the structural frame forming a membrane. A transfer sheath may be used between the mandrel and structural frame to prevent the electro- statically spun fiber from adhering to the mandrel. In another aspect, a first membrane is spun over the mandrel before the structural frame is placed over the mandrel. In this aspect, at least a portion of the structural frame is sandwiched between the membranes. The membrane or membranes and structural frame form a fiber spun frame assembly. The fiber spun frame assembly may be coated with an elastic polymer. In addition, the membrane or membranes may go through some post processing to achieve desired characteristics or configurations.

La présente invention concerne un dispositif médical et un procédé de formation dudit dispositif médical. L'invention se rapporte, en particulier, à un dispositif médical comprenant une structure de membrane tubulaire par-dessus une armature extensible radialement, et à un procédé permettant de former la membrane tubulaire sur l'armature extensible radialement. Selon un aspect de l'invention, on place une armature sur un mandrin de filage et on procède au filage électrostatique d'une fibre par-dessus au moins une partie de l'armature afin de former une membrane. On peut utiliser une gaine de transfert entre le mandrin et l'armature pour empêcher la fibre filée électrostatiquement de coller au mandrin.Selon un autre aspect de l'invention, on file une première membrane par-dessus le mandrin avant de placer l'armature sur le mandrin. Au moins une partie de l'armature se trouve intercalée entre les membranes. La ou les membranes et l'armature forment un ensemble armature à fibre filée. On peut recouvrir l'ensemble armature à fibre filée précité d'un polymère élastique. On peut en outre soumettre la ou les membranes à un post-traitement afin d'obtenir des caractéristiques ou configurations désirées.

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