Rotational atherectomy device

A - Human Necessities – 61 – B

Patent

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Details

A61B 17/22 (2006.01) A61B 17/32 (2006.01)

Patent

CA 2262873

This invention is an atherectomy device for removing tissue from an artery. The device includes a flexible, elongated drive shaft (20) rotatable about a guide wire (15), the drive shaft having an enlarged diameter tissue removal section (28). The drive shaft and the enlarged diameter tissue removal section are comprised of helically wound wire. Wire turns of the proximal portion (30) of the tissue removal section have diameters that gradually increase distally at a generally constant rate thereby forming generally the shape of a cone. Wire turns of the distal portion (40) of the enlarged diameter tissue removal section have diameters that gradually decrease distally thereby forming a generally convex distal portion. At least part of the tissue removal section includes an external coating of an abrasive material (24) to define an abrasive segment of the drive shaft.

L'invention concerne un dispositif d'athérectomie permettant d'enlever des tissus d'une artère. Le dispositif comprend une tige d'entraînement flexible et de forme allongée (20) pouvant tourner autour d'un fil de guidage (15), la tige d'entraînement ayant une section (28) de diamètre élargi pour enlever des tissus. La tige d'entraînement et la section à diamètre élargi sont constituées d'un fil métallique enroulé de manière hélicoïdale. Les spires du film de la partie proximale (30) de la section d'enlèvement des tissus ont des diamètres qui augmentent progressivement vers la partie distale à une cadence pratiquement constante afin de former un cône. Les spires du film de la partie distale (40) de la section à diamètre élargi pour l'enlèvement des tissus ont des diamètres qui diminuent progressivement vers la partie distale afin de former une partie distale généralement convexe. Au moins une partie de la section d'enlèvement des tissus possède un revêtement externe d'un matériau abrasif (24) afin de définir un segment abrasif de la tige d'entraînement.

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