Interventional catheters having differential cutting surfaces

Details Interventional catheters having differential cutting surfaces Interventional catheters having differential cutting surfaces

A - Human Necessities

61

B

A61B 17/3207 (2006.01) A61B 17/32 (2006.01)

Patent

CA 2518497

An interventional catheter incorporates an advanceable, rotatable operating head or cutter assembly (50, 72, 80, 120, 140) having one or more distally located differential cutting surfaces (52, 74, 82, 124, 145, 154, 164) having a cant angle of less than 90~, the cant angle being an angle of intersection of the cutting surface and a line tangent to the circumference of the cutter assembly. A fixed blade cutter assembly (50, 72, 80, 120, 140) has a plurality of differential cutting surfaces (52, 74, 82, 124, 145, 147, 154, 164) with large ports (68, 125, 143) provided between neighboring differential cutting blades providing access to a sealed lumen and aspiration system. A dual cutter assembly having a fixed blade cutter assembly (200) and an adjustable blade cutter assembly (210) is also provided. A drive shaft provides rotation and torque from a drive system to the cutter assembly and may be coupled to the cutter assembly by means of an articulating bearing assembly (250).

L'invention a trait à un cathéter chirurgical, qui comporte un ensemble actionneur ou de coupe rotatif pouvant être avancé (50, 72, 80, 120, 140), lequel possède une ou plusieurs surfaces de coupe différentielles placées distalement (52, 74, 82, 124, 145, 154, 164) et présentant un angle de chanfrein inférieur à 90·, l'angle de chanfrein étant l'angle formé par l'intersection de la surface de coupe et d'une ligne tangente à la circonférence de l'ensemble lames. Un ensemble de coupe à lames fixes (50, 72, 80, 120, 140) comprend une pluralité de surfaces de coupe différentielles (52, 74, 82, 124, 145, 147, 154, 164) dotées de grands orifices (68, 125, 143) placés entre des lames de coupe différentielles voisines donnant accès à un système d'aspiration à lumière fermée. L'invention concerne également un double ensemble de coupe, possédant un ensemble de coupe à lames fixes (200) et un ensemble de coupe à lames réglables (210). Sous l'action d'un système d'entraînement, un arbre d'entraînement fournit rotation et couple à l'ensemble de coupe, et peut être couplé à l'ensemble de coupe à l'aide d'un ensemble palier à articulation (250).

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