Stent deployment catheter with collapsible sheath

A - Human Necessities – 61 – F

Patent

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Details

A61F 2/06 (2006.01)

Patent

CA 2219658

The present invention provides an improved stent delivery catheter. The stent delivery system comprises a catheter having a stent receiving portion adapted to receive a stent near the distal end of the catheter and a stent concentrically arranged around the catheter within the stent receiving portion. The stent delivery system further comprises a proximal outer sheath, a retractable distal sheath surrounding at least a portion of the stem and containing the stent in its reduced delivery configuration and a pull back means connected to the retractable distal sheath. The system further comprises a collapsible sheath concentrically arranged around the catheter and located between the retractable distal sheath and the proximal outer sheath, whereby when the pull back means is pulled proximally the distal sheath is retracted, causing the collapsible sheath to collapse and freeing the stent for delivery.

La présente invention concerne un cathéter amélioré pour placer une prothèse intravasculaire. Le système permettant de placer cette prothèse comprend un cathéter ayant une portion pour recevoir la prothèse près de l'extrémité distale du cathéter et une prothèse disposée de manière concentrique autour du cathéter, dans la portion pour recevoir la prothèse. Le système pour placer la prothèse comprend, en outre, une gaine externe proximale, une gaine distale rétractable entourant au moins une portion de la prothèse et tenant la prothèse dans sa position serrée d'introduction et un moyen de traction relié à la gaine distale rétractable. Le système comprend en outre une gaine pouvant s'affaisser disposée concentriquement autour du cathéter et placée entre la gaine distale rétractable et la gaine externe proximale. Dans un tel système, quand le moyen de traction est tiré dans la direction proximale, la gaine distale se rétracte, en provoquant l'affaissement de la gaine et en libérant la prothèse pour sa mise en place.

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