High frequency electrosurgical instrument for cutting human body cavity structures
First Claim
1. A high frequency electrosurgical instrument for cutting human body cavity structures including:
- an electrically insulated sheath having proximal and distal ends;
a metal wire member extending through the sheath and having a bend which extends from the distal end of the sheath and at which the metal wire member is folded back toward the distal end of the sheath, said metal wire member adapted to be connected to a high frequency source by means for effecting electrical connection therebetween and comprising an operating wire constituted by that portion of the metal wire member which extends through the sheath and which lies between the bend and the proximal end of the sheath and has a distal end portion extendable from the distal end of the sheath, means for reciprocating the operating wire at the proximal end of the sheath, and a cutting wire constituted by that portion of the metal wire member which is folded back toward and lies between the bend and the distal end of the sheath, with one end thereof remote from said bend held by the sheath, said cutting wire being kept substantially straight and fixed in length no matter how far the distal end portion of said operating wire is extended from the distal end of the sheath; and
an electrically insulated, flexible wrapping member mounted on the distal end portion of the operating wire.
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Accused Products
Abstract
A high frequency electrosurgical instrument for cutting human body cavity structures comprises a sheath made of an electrically insulating material and a metal wire. The metal wire consists of an operating wire portion reciprocating through the sheath and a cutting wire portion folded back toward the sheath at the end of the operating wire portion extended from the distal end of the sheath. The end of the cutting wire portion which is remote from the end of the operating wire portion is held by the sheath and at least the part of the operating wire portion extensible from the distal end is covered with an electrically insulating wrapping member. After the distal end portion of the sheath of the instrument is conducted through the channel in an endoscope at human body cavity structures, the operating wire portion is extended from the distal end of the sheath and its extended portion is pulled by the cutting wire and curved so that the extended end portion of the wrapping member abuts against the inner wall of the human cavity and prevents other structures than those to be cut from being damaged by the cutting wire portion.
359 Citations
16 Claims
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1. A high frequency electrosurgical instrument for cutting human body cavity structures including:
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an electrically insulated sheath having proximal and distal ends; a metal wire member extending through the sheath and having a bend which extends from the distal end of the sheath and at which the metal wire member is folded back toward the distal end of the sheath, said metal wire member adapted to be connected to a high frequency source by means for effecting electrical connection therebetween and comprising an operating wire constituted by that portion of the metal wire member which extends through the sheath and which lies between the bend and the proximal end of the sheath and has a distal end portion extendable from the distal end of the sheath, means for reciprocating the operating wire at the proximal end of the sheath, and a cutting wire constituted by that portion of the metal wire member which is folded back toward and lies between the bend and the distal end of the sheath, with one end thereof remote from said bend held by the sheath, said cutting wire being kept substantially straight and fixed in length no matter how far the distal end portion of said operating wire is extended from the distal end of the sheath; and an electrically insulated, flexible wrapping member mounted on the distal end portion of the operating wire. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16)
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Specification