Guide catheter with lubricious inner liner

A - Human Necessities – 61 – L

Patent

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Details

A61L 27/28 (2006.01) A61L 29/08 (2006.01) A61L 29/12 (2006.01) A61L 31/10 (2006.01) A61L 31/12 (2006.01)

Patent

CA 2401128

A catheter shaft is disclosed utilizing perfluoroalkoxy polytetrafluoroethylene (PFA) as a lubricious inner lumen for which to aid the advancement of additional medical devices. PFA possesses adequate lubricity while requiring no special fabricating techniques. Thus, PFA may be processed by conventional melt-extrusion techniques, as well as by injection, compression, rotational transfer, and blow molding processes; optimizing the manufacturability of the lubricious inner lumen. Additionally, the catheter shaft includes portions of the outer tubular member modified through an ablation process. The ablation process selectively removes extruded polymeric material around and between the contours of a braided support layer. In one illustrative embodiment, a portion of the outer layer of the catheter is removed by laser ablation and then refilled by polymeric inserts having various flexibility characteristics.

L'invention concerne une tige de cathéter utilisant du polytétrafluoréthylène perfluoroalcoxy (PFA) comme revêtement lubrifiant de la lumière interne qui facilite l'avancement de dispositifs médicaux supplémentaires. Le PFA a un pouvoir lubrifiant adéquat et ne nécessite pas de techniques de fabrication spéciales. De cette manière, on peut traiter le PFA par des techniques traditionnelles d'extrusion de matière moulée et par injection, compression, transfert par rotation et moulage par soufflage; on peut optimiser la capacité de traitement de la lumière interne lubrifiante. En outre, la tige de cathéter comprend des parties d'un élément tubulaire externe modifié par procédé d'ablation. Le procédé d'ablation permet de retirer de façon sélective la matière polymère extrudée autour et entre les contours d'une couche de support tressée. Dans un mode de réalisation d'exemple, une partie de la couche externe du cathéter est enlevée par ablation au laser puis remplie de nouveau au moyen d'inserts polymères présentant des caractéristiques de souplesse différentes.

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