Catheter system and method for boring through blocked...

A - Human Necessities – 61 – B

Patent

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Details

A61B 17/22 (2006.01) A61B 17/221 (2006.01) A61B 17/3207 (2006.01) A61M 25/09 (2006.01)

Patent

CA 2722401

A rotating cutting head catheter for passage through chronic total occlusions or other refractory atherosclerotic plaque from diseased arteries is disclosed. The catheter's rotating cutting head is designed to reside safely within an outer protective sheath when not in use. The outer protective sheath contains one or more helical groves or slots, and the cutting head contains protruding blades or projections that fit into these helical groves or slots. Application of torque to an inner catheter or wire attached to the cutting head applies spin to the cutting head, and the force of the sheath's helical groves or slots against the cutting head's protruding blades or projections advances the cutting head outward from the protective sheath. Once extended, the cutting head may now rotate freely. The device may use a guidewire to direct the cutting head to the desired position.

Cette invention concerne un cathéter à tête coupante rotative capable d'ouvrir un passage dans des occlusions totales chroniques ou autre plaque athéroscléreuse réfractaire d'artères atteintes. La tête coupante rotative du cathéter est conçue pour rester en toute sécurité à l'intérieur d'une gaine de protection extérieure quand elle n'est pas utilisée. La gaine de protection extérieure contient une ou plusieurs rainures ou fentes hélicoïdales, et la tête coupante contient des lames protubérantes ou des protubérances qui se logent dans ces rainures ou fentes hélicoïdales. L'application d'un couple à un cathéter ou fil intérieur attaché à la tête coupante applique un mouvement de rotation à la tête coupante, et la force des rainures ou des fentes hélicoïdales de la gaine contre les lames protubérantes ou les protubérances de la tête coupante fait sortir la tête coupante de sa gaine de protection. Une fois exposée, la tête coupante peut alors tourner librement. Le dispositif peut utiliser un guide-fil pour diriger la tête coupante jusqu'à la position souhaitée.

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