Catheter having flexible distal region for deflecting axial...

A - Human Necessities – 61 – M

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Details

A61M 25/00 (2006.01) A61B 17/00 (2006.01) A61M 25/01 (2006.01) A61N 1/05 (2006.01)

Patent

CA 2327463

A catheter having a preformed distal shape for positioning a plurality of electrodes at a selected biological site includes a sheath having a preformed bend in the distal end region to distribute axial forces applied, in the distal direction, to the distal end region over a surface area of the distal end region proximal the distal tip. Also included in the catheter sheath is a stylet formed of a material capable of retaining a shape with the distal end of the stylet shaped in the preformed bend. Preferably, the preformed bend is approximately 45 degrees. Axial forces applied to the catheter are deflected to cause bowing of the catheter so that a larger surface area of the catheter contacts the tissue, rather than the smaller surface area of the distal tip. In other aspects, the portion of the sheath coincident with the preformed bend has a lower durometer, the stylet is more flexible by having a reduced diameter and the electrodes are located proximal to the prreformed bend.

Ce cathéter, à région distale préformée aux fins du positionnement de plusieurs électrodes au niveau d'un site biologique sélectionné, comporte une gaine à extrémité distale à courbure préformée de manière à répartir des forces axiales appliquées, dans le sens distal, au-dessus de la région distale sur une zone proche de la pointe distale. Ce cathéter comporte également un stylet fait d'un matériau à mémoire de forme et dont l'extrémité distale a une courbure préformée, de préférence, de 45· environ. Les forces axiales s'exerçant sur le cathéter sont déviées de manière à cintrer le cathéter dont une plus grande surface pourra alors venir au contact du tissu, bien mieux qu'il n'en serait avec la surface plus petite de sa pointe distale. Selon d'autres aspects de l'invention, la partie de la gaine correspondant à la courbure préformée est d'une dureté inférieure mesurée au duromètre, le stylet est plus souple du fait de son diamètre réduit et les électrodes se trouvent à proximité de la courbure préformée.

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