Improved actuating handle with pulley system for providing mechanical advantage to a surgical working element
First Claim
1. A medical device comprising a body, an actuating member mounted to said body in a manner permitting relative movement therebetween, a working element remote from said body, and an elongated force-transmitting member extending between said actuating member and said working element and capable of transmitting bi-directional actuating force between said actuating member and said working element, said actuating member including a pulley surface bodily movable therewith, said force-transmitting member including a flexible cable portion trained about said pulley surface such that movement of said actuating member in either direction a given distance, relative to said body, causes said working element to move a substantially greater distance than said given distance.
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0 Petitions
Accused Products
Abstract
A medical device has a body, an actuating member mounted to move relative to the body, a working element, and an elongated force-transmitting member capable of transmitting actuating force between the actuating member and the working element. The force-transmitting member includes a flexible cable portion, the force-transmitting member is attached, on one side of the cable portion, to the body and associated in a driving relationship on the opposite side of the cable portion with the working element. According to the invention the actuating member includes a pulley surface bodily movable therewith, the cable portion is trained about the pulley surface such that movement of the actuating member a given distance, relative to the body, causes the working element to move a substantially greater distance than the given distance. Another aspect of the invention is a medical snare with the above features.
487 Citations
24 Claims
- 1. A medical device comprising a body, an actuating member mounted to said body in a manner permitting relative movement therebetween, a working element remote from said body, and an elongated force-transmitting member extending between said actuating member and said working element and capable of transmitting bi-directional actuating force between said actuating member and said working element, said actuating member including a pulley surface bodily movable therewith, said force-transmitting member including a flexible cable portion trained about said pulley surface such that movement of said actuating member in either direction a given distance, relative to said body, causes said working element to move a substantially greater distance than said given distance.
- 16. A medical snare device comprising a body, an actuating member mounted to said body in a manner permitting movement therebetween, a snare remote from said body, and a cable extending between said actuating member and said snare and capable of transmitting bi-directional actuating force between said actuating member and said snare, said actuating member including a pulley surface bodily movable therewith, said cable being trained about said pulley surface such that movement of said actuating member in either direction a given distance, relative to said body, causes said snare to move a substantially greater distance than said given distance.
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24. A medical snare device comprising a body, a thumb loop integral with said body, an actuating member mounted to said body in a manner permitting relative movement therebetween, a sheath extending distally from said body, an electrical terminal integral with said body, a snare loop remote from said device, and a cable extending between said body at said electrical terminal and said snare loop, said cable being capable of transmitting actuating force between said actuating member and said snare loop, said snare loop capable of being fully retracted within said sheath,
at least one cannula telescopically engaged in said actuating member and at least one cannula telescopically engaged in said body, said cable supported against columnar buckling by said cannulae, said actuating member including at least one finger loop and a pulley surface bodily movable with said actuating member, said cable being trained about said pulley surface such that movement of said actuating member a given distance, relative to said body, causes said snare loop to move a substantially greater distance than said given distance.
Specification