Embolectomy catheters and method for treatment

Details Embolectomy catheters and method for treatment Embolectomy catheters and method for treatment

A - Human Necessities

61

B

A61B 17/22 (2006.01) A61M 25/00 (2006.01)

Patent

CA 2433793

Embolectomy catheters (10, 10', 10'', 10''', 10''''), rapid exchange microcatheters, systems and methods for removing clots or other obstructive material (e.g., thrombus, thromboemboli, embolic fragments of atherosclerotic plaque, foreign objects, etc.) from blood vessels. This invention is particularly useable for percuatneous removal of thromboemboli or other obstructive matter from small blood vessels of the brain, during an evolving stroke or period of cerebral ischemia. In some embodiments, the embolectomy catheters (10, 10', 10'', 10''', 10'''') of this invention are advanceable with or over a guidewire (GW) which has been pre-inserted through or around the clot. Also, in some embodiments, the embolectomy catheters include clot removal devices which are deployable from the catheter after the catheter has been advanced at least partially through the clot. The clot removal device may include a deployable wire nest (14) that is designed to prevent a blood clot from passing therethrough. The delivery catheter may include telescoping inner and outer tubes, with the clot removal device being radially constrained by the outer tube. Retraction of the outer tube removes the constraint on the clot removal device and permits it to expand to its deployed configuration. An infusion guidewire is particularly useful in conjunction with the embolectomy catheter, and permits infusion of medicants or visualization fluids distal to the clot.

Cathéters d'embolectomie (10, 10', 10'', 10''', 10''''), microcathéters à échange rapide, systèmes et procédés pour évacuer les caillots ou d'autres matières obstructives telles que les thrombus, les substances thromboemboliques, les fragments emboliques de la plaque d'athérosclérose, les corps étrangers, etc. L'invention peut notamment s'utiliser pour l'évacuation percutanée des substances thromboemboliques ou d'autres matières obstructives à partir de petits vaisseaux sanguins du cerveau à la suite d'un accident cerébro-vasculaire en évolution ou d'une période d'ischémie cérébrale. Dans certains modes de réalisation, les cathéters d'embolectomie comprennent des dispositifs de récupération de caillots qui peuvent se déployer à partir du cathéter une fois que celui-ci a été déplacé, au moins partiellement. à travers le caillot. Le dispositif d'évacuation de caillots comprend un nid en fils à capacité de déploiement (14), conçu de manière à ce que les caillots ne puissent pas le traverser. Le cathéter d'acheminement peut comprendre des tubes télescopiques interne et externe, le dispositif d'évacuation de caillots étant radialement limité par le tube externe. Le retrait du tube extérieur a pour effet d'enlever la contrainte exercée sur le dispositif de récupération de caillots et lui permet de se déployer pour se mettre en configuration déployée. Un fil de guidage de perfusion est particulièrement utilisé conjointement avec le cathéter d'embolectomie; il permet de perfuser des médicaments ou des liquides de visualisation à une certaine distance du caillot.

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