Endoscope Treatment Instruments

Abstract

The endoscope treatment tool includes: a soft flexible sheath; an operation wire, which runs through the flexible sheath in a freely advancing and retreating manner; a basket, which is arranged at the distal end of the operation wire, and consists of a plurality of An elastic wire; and a locking part, which is arranged at the distal end of the elastic wire, and is used to gather a plurality of the elastic wires. The radially largest diameter portion of the basket portion is located closer to the locking portion than an intermediate position between the proximal end of the basket portion and the locking portion in the central axis direction. The plurality of elastic wires are each formed in a helical shape wound in the same direction along the entire length, and the winding pitch gradually decreases as the distal end of the operation wire approaches the locking portion.

Description

technical field [0001] The present invention relates to a treatment instrument for endoscope. [0002] This application claims priority based on US Patent Application No. 61 / 474833 filed on April 13, 2011 provisionally in the US, and the content thereof is incorporated herein. Background technique [0003] Conventionally, there are known endoscopic treatment instruments that are inserted endoscopically into the body to grasp foreign bodies such as calculi that occur in the biliary tract or the like. For example, Patent Document 1 discloses a cage-shaped basket composed of a plurality of elastic threads having creases. The basket described in Patent Document 1 can hold a stone by taking the stone into the inside from the gap between the plurality of elastic wires and locking the stone on the elastic wires. [0004] In addition, Patent Document 2 discloses a basket-shaped grasping forceps as another example of an endoscopic treatment instrument for grasping stones. Patent D...

AI Technical Summary

Problems solved by technology

[0007] However, in the case of dilation of the bile duct near the duodenal papilla, if a foreign substance such as a stone enters the dilated part of the bile duct, due to the difference in the inner diameter between the bile duct near the duodenal papilla and the duodenal papilla Larger than usual, thus creating a larger than usual step at the border between the bile duct and the duodenal papilla near the duodenal papilla

In the conventional baskets disclosed in Patent Document 1 and Patent Document 2, when pulled into the duodenal papilla, they are deformed so as to shrink as a whole, so that the elastic wires of the basket sometimes have difficulty reaching the expansion part.

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