Apparatus and method for disrupting vein valves

A - Human Necessities – 61 – B

Patent

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A61B 17/00 (2006.01) A61B 17/22 (2006.01)

Patent

CA 2232352

A valvulotome for disrupting valve cusps in the vein of a patient includes a shaft (14) and a cutting member (12) which extends along an axis that defines an axial direction as well as an angular direction. First and second portions of the cutting member define respective cutting edges which extend outwardly of the axis in an angular relationship and an axial relationship with each other. The first and second cutting edges engage and disrupt different cusps of the valve when the shaft is withdrawn axially from the vein. Each of the cutting edges is protected by a proximate shoulder (123) which inhibits the engagement of side branches by the associated cutting edge. The cutting member may be formed as a helical blade, a wire or a cylinder and may be provided with a swivel coupling (158) as well as a sheath (131) operable to cover or expose the cutting member.

La présente invention concerne un valvulotome destiné à ouvrir des lames valvulaires dans une veine d'un patient. Il comprend une tige (14) et un élément coupant (12) qui s'étend le long d'un axe définissant une direction axiale ainsi qu'une direction angulaire. Une première et une deuxième parties de l'élément coupant délimitent des tranchants respectifs, qui s'étendent à l'extérieur de l'axe, dans une relation angulaire et une relation axiale l'un avec l'autre. Le premier et le deuxième tranchants entrent en contact avec différentes lames valvulaires, et les coupent, quand on retire axialement la tige de la veine. Chacun des tranchants est protégé par un épaulement proximal (123) qui empêche son action sur des branches latérales. L'élément coupant peut être réalisé sous la forme d'une lame hélicoïdale, d'un fil métallique ou d'un cylindre, et il peut être pourvu d'un accouplement à émerillon (158) ainsi que d'une enveloppe (131) utilisable pour couvrir ou découvrir l'élément coupant.

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