Method and system for holding the position of a guiding member

Details Method and system for holding the position of a guiding member Method and system for holding the position of a guiding member

A - Human Necessities

61

M

A61M 25/01 (2006.01) A61M 25/06 (2006.01) A61M 25/00 (2006.01) A61M 29/02 (2006.01)

Patent

CA 2178934

A method and system for maintaining the position of a guiding member, such as a guidewire, within a patient's vascular system, particularly within a guiding catheter disposed within the patient's vascular system, while an intravascular catheter slidably mounted on the guiding member is withdrawn and a replacement catheter is advanced over the guiding member. One presently preferred embodiment includes a guiding sheath having an inner lumen extending the length thereof with an engaging device slidably disposed within the guiding sheath. The guidewire engaging device is torqued from its provimal end which extends out of the proximal end of the guiding catheter so that the flexible distal end wraps around the guidewire tightly enough to maintain the position of the guidewire while withdrawing or advancing a catheter over the guidewire. The distal portion of the guidewire engaging device is preferably a pseudoelastic NiTi alloy which is in a stable austenite phase at body temperature (37°C) and which exhibits a stress-induced transformation from the austenite phase to a martensite phase.

La présente invention concerne un procédé et un dispositif de maintien en position d'un organe de guidage, tel qu'un fil-guide, à l'intérieur du système vasculaire d'un patient (en l'occurrence dans un cathéter-guide placé à l'intérieur du système vasculaire du patient) pendant le retrait d'un cathéter intravasculaire monté en relation coulissante sur l'organe de guidage et la progression d'un cathéter de remplacement. L'une des réalisations actuellement préférées comporte une gaine-guide présentant sur toute sa longueur intérieure une lumière, la gaine-guide étant munie à l'intérieur d'un organe d'engagement disposé en relation coulissante. Un couple appliqué à l'organe d'engagement à fil-guide par son extrémité proximale dépassant de l'extrémité proximale du cathéter-guide fait que l'extrémité distale souple enveloppe le fil-guide avec suffisamment de fermeté pour maintenir en position le fil-guide pendant le retrait ou la progression d'un cathéter sur le fil-guide. La partie distale de l'organe d'engagement à fil-guide est réalisée de préférence en un alliage pseudo-élastique NiTi dont la phase austénite est stable à température du corps (37 ~C), l'induction d'une contrainte provoquant sur cet alliage une transformation de phase austénite en phase martensite.

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