Water jet surgical instrument

Abstract

The invention relates to a water jet surgical instrument (10), comprising a feed line for feeding a cutting fluid, and an ejection nozzle (11) for forming and ejecting a fluid jet at a predetermined expansion angle and / or at a predetermined discharge energy. A jet-forming device (12) is disposed relative to the ejection nozzle such that the fluid jet is or can be adjusted by the jet-forming device with respect to the expansion angle and / or the discharge energy thereof.

Description

technical field [0001] The invention relates to a water jet surgical instrument according to the preamble of claim 1 . Background technique [0002] When performing tissue resection, especially when resection of gastrointestinal tumor tissue is limited to the mucosa, surgical resection should be performed as much as possible at one time. For this operation, snare cauterization or the cap technique is usually used, wherein a circular cut of variable size depending on the diameter of the snare or cap has been produced. [0003] In order to be able to resect large tumors with a diameter greater than 8 cm as completely as possible at one time, as suggested in WO2006 / 108480A1, usually during endoscopic mucosal resection, fluid is first injected into the submucosa through a curved needle before resection . [0004] For this, a needle is inserted into the submucosa. Due to the penetration of fluid into the mucosa, the mucosa separates from the muscularis propria, forming a fluid...

AI Technical Summary

Problems solved by technology

[0007] The problem with the prior art described above is that, during such endoscopic submucosal dissection, perforation of the muscularis propria (hereinafter simply referred to as "muscle") occurs with the use of a water jet, which causes dangerous internal bleeding and hampers the surgeon's observation, so the surgical site must be flushed

This requires the instruments to be removed from the operating table, causing further delay and danger to the patient

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