Reinforced catheter and method of manufacture

Details Reinforced catheter and method of manufacture Reinforced catheter and method of manufacture

A - Human Necessities

61

M

A61M 25/00 (2006.01)

Patent

CA 2417701

A catheter shaft is disclosed that may reduce the thickness of the inner layer and/or allow the reinforcing layer to share the same space as the inner lubricious layer. In one illustrative embodiment, the inner lubricious layer is removed altogether, and an inner tubular braid member defines the inner lumen of the catheter shaft. In another illustrative embodiment, the inner lubricious layer and the reinforcing layer are effectively combined to form a reinforcing member. To combine the inner lubricious layer and the reinforcing layer, the wires used to form the reinforcing braid or coil are first coated with a lubricious polymer such as PTFE or PFA. When these strands are wound to form the tubular reinforcing member, the inner surface of the reinforcing member includes a lubricious surface. Various methods are also disclosed for providing a smooth inner surface for the catheter shaft.

L'invention concerne un tube de cathéter dans lequel on peut réduire l'épaisseur de la couche interne et/ou faire en sorte que la couche renfort et la couche interne lubrifiante partagent le même espace. Selon une variante, la couche lubrifiante est éliminée, et un élément tubulaire interne tressé définit la lumière interne du tube du cathéter. Selon une autre variante, les deux couches sont combinées pour former un renfort. Pour combiner les deux couches, on revêt d'abord les fils du tressage ou du serpentin de renfort avec un polymère lubrifiant du type polytétrafluoroéthylène ou perfluoroalcoxy. Lorsque les brins sont enroulés pour constituer le renfort tubulaire, la surface interne de ce renfort comporte une surface lubrifiante. L'invention concerne également différents procédés conférant une surface interne lisse au tube du cathéter.

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