Importance

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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.

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First Claim