Eccentric abrading and cutting head for high-speed...

A - Human Necessities – 61 – B

Patent

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Details

A61B 17/3207 (2006.01)

Patent

CA 2718074

The invention provides a rotational atherectomy device having, in various embodiments, a flexible, elongated, rotatable drive shaft with at least one flexible or inflexible eccentric enlarged abrading and cutting head attached thereto which comprises an abrasive surface. When placed against stenotic tissue and rotated at high speed, the eccentric nature of the abrading and cutting head moves along an orbital path, opening the lesion to a diameter larger than the resting diameter of the enlarged abrading and cutting head. Preferably the abrading and cutting head has a center of mass spaced radially from the rotational axis of the drive shaft, facilitating the ability of the device to travel along an orbital path. The abrading and cutting head comprises proximal and/or distal radiused surfaces that facilitate cutting difficult stenosis material while minimizing trauma to the vessel.

L'invention porte sur un dispositif d'athérectomie rotatif comportant, dans divers modes de réalisation, un arbre d'entraînement flexible, allongé, rotatif avec au moins une tête d'abrasion et de découpe agrandie excentrique flexible ou non flexible fixée à celui-ci, qui comprend une surface abrasive. Lorsqu'elle est placée contre un tissu sténotique et tourne à vitesse élevée, la nature excentrique de la tête d'abrasion et de découpe se déplace le long d'un trajet orbital, ouvrant l'incision à un diamètre supérieur au diamètre restant de la tête d'abrasion et de découpe agrandie. De préférence, la tête d'abrasion et de découpe possède un centre de masse éloigné radialement de l'axe de rotation de l'arbre d'entraînement, facilitant l'aptitude du dispositif à se déplacer le long d'un trajet orbital. La tête d'abrasion et de découpe comporte des surfaces arrondies proximales et/ou distales qui facilitent la découpe d'un matériau de sténose difficile, tout en minimisant un trauma du vaisseau.

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