Endoscopic treatment instrument

Abstract

An endoscopic treatment instrument (1) is provided comprising: a cylinder (2) adapted to be fitted over a tip of an insertion section (I1) of an endoscope (E1); a loop-shaped snare wire (SW) which protrudes in the cylinder from a snare sheath (SS) that is extendable and retractable with respect to the insertion section and which is extendable within the cylinder; a hooked portion (3) which is formed and radially inwardly extended from the circumference of the tip of cylinder and which holds the snare wire within the cylinder; a locking portion (5) which is provided on the hooked portion and retains a folded-back portion (W) of the snare wire that is forwardly moved toward the cylinder tip with respect to the snare sheath and by means of which the snare wire is turned upside-down around the folded-back portion.

Description

technical field

[0001] The invention relates to an endoscope treatment instrument.

[0002] This application claims priority from Japanese Patent Application No. 2006-257351 filed September 22, 2006, the contents of which are hereby incorporated by reference. Background technique

[0003] In the case of early gastric cancer or esophageal cancer, endoscopic mucosal dissection is performed in which the mucosa in the lesioned or infected area is resected using a frequency snare introduced into the body cavity through the channel of the endoscope. In such mucosal dissection surgery, an endoscopic treatment instrument is used, which includes an overall cylindrical transparent cap fitted on the tip end of an insertion portion of an endoscope.

[0004] In the operation using this endoscopic treatment instrument, the snare wire of the high-frequency snare is first radially expanded in the transparent cap, and then the mucosa to be resected is attracted to the transparent cap while ...

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