Two-Chamber Snare for Polyp Stalk Fixation
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Solution Overview
Problem
Conventional snares for polypectomy face challenges in removing pedunculated polyps with stalks of varying thicknesses, as they often result in bleeding and difficulty in fixing the desired portion of the polyp due to the twisted shape of the stalk and the need for external rings, which complicate the surgical process.
Innovation Solution
A medical two-chamber snare with a special metal structure, where a stalk is spread through a first chamber and fixed with a ring in a second chamber, allowing for stable fixation and easy removal of the polyp head, reducing bleeding risks and simplifying surgery by maintaining the initial entry direction of the ring.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional snare is used to remove pedunculated polyps with stalks of varying thicknesses, then the polyp can be excised, but bleeding occurs and it is difficult to fix the desired portion of the polyp
Solution Approach 1:
The snare is divided into multiple chambers (first chamber and second chamber) that can independently accommodate and manipulate different portions of the polyp. The first chamber handles the stalk while the second chamber handles the head, allowing separate optimization of fixation and excision functions to resolve the contradiction between reliable bleeding control and ease of operation.
Solution Approach 2:
The second chamber is nested within or alongside the first chamber, with the ring mechanism contained within the chamber structure. This nested arrangement allows the ring to be precisely positioned and discharged at the desired location on the polyp stalk while maintaining the overall snare structure, improving both fixation accuracy and bleeding control.
2Ease of operation
If a ring is mounted on the outer circumference of the snare and discharged, then the polyp can be fixed, but time interval occurs and it is difficult to fix the desired portion
Solution Approach 1:
The ring is pre-mounted on the outer circumference of the snare in a ready-to-discharge position before the snare is inserted into the polyp. This preliminary preparation eliminates the need for separate ring attachment steps during surgery, reducing surgical time while maintaining precise fixation capability when the ring is discharged at the optimal moment.
Solution Approach 2:
The snare structure itself provides the fixation mechanism through the pre-mounted ring, eliminating the need for separate fixation devices or steps. The ring is automatically positioned and can be discharged directly from the snare structure, streamlining the procedure and reducing time loss while maintaining fixation precision.
3Productivity
If electricity is passed through the snare to cut the polyp, then the polyp can be removed, but coagulation does not occur sufficiently in thick stalks resulting in acute and delayed bleeding
Solution Approach 1:
The snare separates the excision function (electric current application) from the hemostasis function (ring mechanical compression). The first chamber with the ring provides mechanical compression for sufficient coagulation in thick stalks, while the second chamber handles the excision, resolving the contradiction between removal efficiency and hemostasis effectiveness.
Solution Approach 2:
The snare combines mechanical compression (ring) and electrical excision (current) into a single integrated device. The ring provides mechanical compression to achieve sufficient coagulation while the electrical current performs the cutting, merging two functions that complement each other to simultaneously achieve efficient removal and reliable hemostasis.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The two-chamber snare effectively removes polyp heads with reduced bleeding and simplifies the surgical process by stabilizing the ring's entry direction and saving time, making it easier to manage polyps of different stalk thicknesses.
Implementation Method 1
the ring discharged from the body shrinks through the elasticity and then fixes the pulled first portion
Implementation Method 2
a snare made of a special metal is introduced through a working channel of an endoscope, and then electricity is passed through when grasping a polyp so as to cut it
Data Source
AI summary
Disclosed herein is a snare (transparent cap) for removing a polyp which includes a stalk and a head connected to the stalk, wherein the snare includes: a body having a hollow tubular shape and an interior of which is partitioned into a plurality of chambers; a ring mounted to at least part of the body using elasticity; a first snare discharged outside the body through a first chamber among the plurality of chambers and hooks the stalk; and a second snare which is discharged outside the body through a second chamber among the plurality of chambers, wherein when the stalk is spread according to pulling the first snare that hooks the stalk, and the second snare pulls a first portion in a lower end of the stalk as spread including the head, the ring is discharged from the body and shrinks through the elasticity and then fixes the first portion.