Positively expanding and retracting medical extractor

A - Human Necessities – 61 – B

Patent

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Details

A61B 17/22 (2006.01) A61B 17/221 (2006.01)

Patent

CA 2287990

A medical extractor comprising a canula assembly having an annularly expanding and retracting gripping and releasing mechanism on the distal end thereof and a moving assembly on the proximal end thereof. The arrangement is such that a manual movement of the moving assembly in one direction effects a longitudinally outward movement of an annular array of longitudinally movable wire flexure elements within an annular array of longitudinally fixed tubular flexure elements to cause the fixed flexure elements to flex transversely outwardly and create an annularly expanded condition defined by an annular series of transversely outwardly flexed fixed flexure elements interconnected at their ends by an annular series of arcuately outwardly flexed portions of the movable flexure elements. A manual movement in the opposite direction effects a longitudinally inward movement of the movable flexure elements to cause the expanded condition to progressively retract during which the outwardly flexed fixed flexure elements are progressively less flexed transversely outwardly and the arcuately flexed portions of the movable flexure elements have a progressively less arcuate extent.

Cet extracteur médical comporte un ensemble canule, pourvu en son extrémité distale d'un mécanisme de préhension et de libération se déployant et se repliant, et en son extrémité proximale d'un ensemble mobile. De par l'agencement général, un mouvement manuel de l'ensemble mobile dans un sens provoque un mouvement longitudinalement extérieur d'une suite annulaire d'éléments de flexion du fil longitudinalement mobiles dans une suite annulaire d'éléments de flexion du fil longitudinalement fixes de façon à amener les éléments de flexion à s'infléchir transversalement vers l'extérieur et à créer un état d'expansion annulaire défini par une suite annulaire d'éléments de flexion fixés infléchis transversalement vers l'extérieur, interconnectés à leurs extrémités par une suite annulaire de parties d'éléments de flexion mobiles infléchies extérieurement arquées. Un mouvement manuel dans le sens opposé provoque un mouvement intérieur des éléments de flexion mobiles faisant que l'état d'expansion se transforme en repliement progressif pendant quoi les éléments de flexion fixes extérieurement infléchis se retrouvent progressivement transversalement moins infléchis vers l'extérieur, les parties infléchies en arc des éléments de flexion mobiles étant progressivement moins arquées.

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