Endoscopic instrument system having reduced backlash control...

Details Endoscopic instrument system having reduced backlash control... Endoscopic instrument system having reduced backlash control...

A - Human Necessities

61

B

A61B 1/00 (2006.01) A61B 1/015 (2006.01) A61B 1/018 (2006.01)

Patent

CA 2396823

An endoscopic instrument has a control member (220), a portion of the member having an outer surface with a non-circular cross-sectional shape. The non-circular cross-sectional shape may be provided to the control member by providing peripheral projections (232) of fins along the length of the portion or by providing the periphery of the portion with a polygonal shape. Where fins are used, the fins are preferably quite small and only have a minimal effect on the fluid flow cross-sectional area between the interior of the endoscope instrument shaft and the central control member. The resulting instrument has significantly reduced backlash in end effector (228) assembly manipulation, while maintaining adequate fluid flow in the endoscope shaft.

L'invention se rapporte à un instrument endoscopique comportant un élément de commande (220), dont une partie présente une surface externe ayant une section transversale de forme non circulaire. Cette forme de section transversale non circulaire peut être conférée à l'élément de commande au moyen de protubérances périphériques (232) d'ailettes disposées le long de la partie ou du fait que ladite partie présente une forme polygonale. Lorsque des ailettes sont utilisées, celles-ci sont de préférence très petites et elles n'ont qu'un effet minimal sur la surface de la section transversale d'écoulement du fluide entre l'intérieur de la tige de l'instrument endoscopique et l'élément de commande centrale. L'instrument résultant présente un jeu réduit de manière significative lors de la manipulation de l'ensemble des dispositifs effecteurs distaux (228) et il assure cependant une circulation de fluide adéquate dans la tige de l'endoscope.

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