Endoscope Forceps Teeth Segmentation for Tissue Grip
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Solution Overview
Problem
High-frequency forceps used in endoscopes apply a large reaction force to tissues, causing them to slip off due to unsharp, thick teeth surfaces, which prevents reliable tissue holding.
Innovation Solution
The forceps surfaces feature a pair of teeth regions: a proximal region with unsharp, thick first teeth and a distal region with sharp, thinner second teeth, allowing the forceps to securely grip tissues by applying pressure through the ridgelines of the sharp teeth when closed.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the forceps surfaces are formed with unsharp, thick teeth to ensure uniform contact width, then cauterization can be performed constantly with uniform width, but a large reaction force is applied to the tissue causing it to slip off
Solution Approach 1:
The forceps surface is segmented into multiple teeth rather than being a single continuous surface. This segmentation allows the teeth to individually engage with tissue irregularities while maintaining overall uniform contact width, resolving the contradiction between uniform cauterization and reliable tissue holding.
Solution Approach 2:
Each tooth is designed with a sharp tip (different from the uniform unsharp surface) to locally penetrate and grip tissue, while the overall forceps surface maintains uniform width for consistent cauterization. This local sharpness combined with global uniformity resolves the contradiction.
2Stability of the object's composition
If the teeth top surfaces are formed to be unsharp and thick to maintain uniform contact, then consistent cauterization is achieved, but the reaction force becomes comparatively large causing tissue to slip
Solution Approach 1:
Instead of making the entire forceps surface unsharp and thick for uniform contact, the invention inverts the approach by making the teeth tips sharp while maintaining uniform overall surface width. This inversion allows the sharp tips to engage tissue effectively without generating excessive reaction forces, while still achieving uniform cauterization width.
3Reliability
If sharp teeth are used to grip tissue firmly, then tissue holding reliability improves, but uniform cauterization width becomes difficult to maintain
Solution Approach 1:
The forceps surface is divided into multiple discrete teeth that can individually adapt to tissue contours, providing reliable grip through sharp tips while the overall segmented structure maintains uniform contact width for consistent cauterization.
Solution Approach 2:
The teeth are designed with sharp local tips for reliable tissue engagement, while the overall forceps surface maintains uniform width characteristics. This local sharpness with global uniformity simultaneously achieves both reliable tissue holding and uniform cauterization width.
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
This configuration ensures that tissues are reliably held and less likely to slip, enabling effective cauterization and coagulation with a high-frequency current by maintaining tissue contact and applying consistent pressure.
Implementation Method 1
a large pressure is applied to the sandwiched subject tissue by ridgelines, and the subject tissue rarely slips from the teeth
Implementation Method 2
a treatment device for an endoscope which applies a high-frequency current... to apply a high-frequency current to a tissue held by a pair of forceps pieces to cauterize and coagulate the tissue
Data Source
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AI summary
A treatment device for an endoscope includes a pair of forceps pieces which has forceps surfaces in contact with a subject tissue and are opened and closed with the forceps surfaces facing each other. Concave portions are formed in the central portions of the forceps surfaces to form the forceps surfaces around the concave portions, and on the forceps surfaces, a first region on the proximal end side of the forceps pieces has a plurality of first teeth with top surfaces formed to be unsharp, and a second region on the distal end side of the forceps pieces to the first region has a plurality of second teeth with top surfaces formed to be sharp.