Rotational atherectomy device and method to improve abrading...

A - Human Necessities – 61 – B

Patent

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A61B 17/3207 (2006.01)

Patent

CA 2755424

The invention provides a rotational atherectomy system, device and method having, in various embodiments, a flexible, elongated, rotatable drive shaft with at least one eccentric abrading head attached thereto, wherein the abrading head comprises at least one groove thereon. The eccentric grooved abrading comprises a tissue removing surface--typically an abrasive surface and/or at least one groove. Preferably the eccentric enlarged abrading head has a center of mass spaced radially from the rotational axis of the drive shaft, facilitating the ability of the device to open the stenotic lesion to a diameter substantially larger than the outer diameter of the enlarged abrading head when operated at high speeds. The groove(s) provide improved efficacy in the abrasion of non-calcified and/or soft tissue as well as provide a means for breaking the hydraulic wedge between the abrading head and the stenotic tissue.

L'invention porte sur un système, un dispositif et un procédé d'athérectomie rotatif, ayant, dans divers modes de réalisation, un arbre d'entraînement souple, allongé, rotatif, avec au moins une tête d'abrasion excentrée fixée à celui-ci, la tête d'abrasion comprenant au moins une rainure sur celle-ci. La tête d'abrasion excentrée à rainure comprend une surface d'enlèvement de tissu typiquement une surface abrasive et/ou au moins une rainure. De préférence, la tête d'abrasion agrandie excentrée a un centre de gravité espacé radialement de l'axe de rotation de l'arbre d'entraînement, facilitant la capacité du dispositif à ouvrir la lésion sténotique à un diamètre sensiblement supérieur au diamètre externe de la tête d'abrasion agrandie lorsque le dispositif est amené à fonctionner à des vitesses élevées. La ou les rainures permettent une efficacité améliorée de l'abrasion de tissu non calcifié et/ou mou et constituent ainsi un moyen pour rompre le coin hydraulique entre la tête d'abrasion et le tissu sténotique.

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