Self-centering valvulotome

A - Human Necessities – 61 – B

Patent

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Details

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

Patent

CA 2193981

Self-centering valvutorome (V) having a flexible cable (1) partly and slidably disposed within a protective sheath (2), a cutting unit (4), having at least three radially mounted, retractable cutting blades, attached to the cable at its distal end, and a dual-purpose control mechanism attached to the cable at its proximal end. Each retractable cutting blade comprises a free-floating cutting head and a flat spring section, which biases the cutting head against the venous wall. The control mechanism comprises a T-valve segment disposed partly within the proximal end of the protective sheath. A pull handle affixed to the proximal end of the cable can engage the T-valve such that a fluid-tight seal is created, thereby allowing the introduction of a diagnostic or therapeutic fluid to the protective sheath via an access port in the valve.

L'invention concerne un valvulotome (V) à autocentrage comprenant un câble flexible (1) disposé partiellement et de façon à pouvoir coulisser dans une gaine protectrice (2), une unité de coupe (4), comportant au moins trois lames rétractables montées radialement, fixées à l'extrémité distale du câble, et un mécanisme de commande à double fonction fixé à l'extrémité proximale dudit câble. Chaque lame rétractable comprend une tête de coupe flottante et une partie plate faisant ressort qui presse la tête de coupe contre la paroi veineuse. Le mécanisme de commande comprend une partie vanne en T placée partiellement dans l'extrémité proximale de la gaine protectrice. Une poignée de traction fixée à l'extrémité proximale du câble peut s'engager dans la vanne T de façon étanche aux liquides, ce qui permet l'introduction d'un fluide de diagnostic ou thérapeutique dans la gaine protectrice, par un orifice d'accès de la vanne.

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