Endoscopic ligation tool and endoscope

Abstract

An endoscopic ligation tool for ligating an internal body tissue such as an esophageal varix, including: an outer cylinder member formed in the shape of a cylinder; an inner cylinder member formed in the shape of a cylinder, which is capable of sliding movement within the outer cylinder member; and an O-ring (ligation band member) which is annular in shape and freely extends and contracts.

Description

TECHNICAL FIELD [0001] The present invention relates to an endoscopic ligation tool and endoscope for ligating a varix that has formed in an internal body tissue, such as the esophagus or stomach. [0002] Priority is claimed on Japanese Patent Application No. 2003-375526, filed Nov. 5, 2003, the content of which is incorporated herein by reference. BACKGROUND ART [0003] An esophageal varix ligation technique may be used alone or in combination with endoscopic sclerotherapy, in which a sclerosing agent is injected, as a method for treating a varix that has formed in the esophagus or stomach. In this esophageal varix ligation technique, suction is employed to draw the varix toward a cylindrical endoscopic ligation tool attached to the end of the endoscope, and a pre-attached O-ring is released and suspended around the root of the varix. The varix is then mechanically ligated under the elastic force of the O-ring, and thereby obliterated. As an example of this endoscopic ligation tool, ...

AI Technical Summary

Benefits of technology

[0039] The endoscope according to the present invention is an endoscope as described above, wherein the suction source is designed to provide a suction pressure such that, when the front end of the inner cylinder member and the internal body tissue are adhered together, the internal body tissue can be drawn up into the inner cylinder member, and relative movement of the inner cylinder member with respect to the outer cylinder member is made possible.

[0040] This endoscope is provided with the above design. As a result, it is possible

Problems solved by technology

However, the endoscopic ligation tool according to the first reference (Japanese Patent No. 2958219) is problematic in that it requires the attachment of a supply device and tube along the inserted part of the endoscope for supplying liquid to the endoscopic ligation tool, and the preparations for this are troublesome.

Further, in both the endoscopic ligation tool according to the second reference (U.S. Pat. No. 4,735,194) and third reference (Published Japanese translation No. 2002-526194 of International Publication), it is necessary to pass t

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