Rotational atherectomy segmented abrading head and method to...

A - Human Necessities – 61 – B

Patent

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A61B 17/3207 (2006.01)

Patent

CA 2750079

The invention provides a rotational atherectomy system, device and method having, in various embodiments, a flexible, elongated, rotatable drive shaft comprising an eccentric abrading head comprising at least one eccentric abrading cylindrical segments attached to the drive shaft and in spaced proximity with proximal and a distal conical segments. Each individual abrading segment, comprises a first tissue removing surface, typically an abrasive coating on the outer surface, that is designed to abrade calcified, hard tissue and abrasive coating on the leading and trailing surfaces designed to abrade non-calcified, soft tissue. Each abrading segment, as well as the abrading head comprising the collective segments, 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 larger than the outer diameter of the enlarged abrading head when operated at high speeds.

L'invention porte sur un système d'athérectomie rotative, sur un dispositif et sur un procédé comportant, dans divers modes de réalisation, un bras d'entraînement souple, allongé et rotatif comprenant une tête d'abrasion excentrée comprenant au moins un segment cylindrique d'abrasion excentrée fixé à l'arbre d'entraînement et à proximité espacée des segments coniques proximaux et distaux. Chaque segment d'abrasion individuel comprend une première surface de retrait de tissu, typiquement un revêtement abrasif sur la surface extérieure, conçu pour abraser un tissu dur, calcifié et un revêtement abrasif sur les surfaces antérieure et postérieure conçu pour abraser un tissu mou non calcifié. Chaque segment d'abrasion, ainsi que la tête d'abrasion comprenant les segments collectifs, a un centre de gravité espacé radialement de l'axe de rotation de l'arbre d'entraînement, facilitant la capacité du dispositif à ouvrir une lésion sténotique selon un diamètre plus important que le diamètre extérieur de la tête d'abrasion agrandie lorsqu'elle est actionnée à des vitesses élevées.

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