Endoscopic Forceps With Segmented Teeth For Tissue Grasping
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Solution Overview
Problem
Conventional endoscopic treatment tools, such as biopsy forceps, face challenges in achieving high performance while maintaining low costs and effectively grasping and collecting tissue samples without missing or slipping, especially due to limitations in design and material usage.
Innovation Solution
The endoscopic treatment tool features a forceps design with specifically configured forceps pieces and a support mechanism that includes a sheath, operation wire, and a unique tooth structure, allowing for precise tissue grasping and collection by adjusting the length and shape of the forceps pieces and incorporating protruding teeth and return teeth to enhance gripping and prevent slipping.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If conventional biopsy forceps with simple cup members are used, then the device complexity is low and cost is reduced, but the gripping force is insufficient and tissue slipping occurs
Solution Approach 1:
The forceps cup member is segmented into multiple functional zones with different tooth configurations. The inner surface includes a first tooth with a first length, a second tooth with a second length longer than the first, and a third tooth with a third length longer than the second, creating progressively longer engagement points along the insertion direction. This segmentation allows each tooth to engage tissue at different depths, collectively providing enhanced gripping force without requiring a completely redesigned forceps structure.
Solution Approach 2:
Different regions of the forceps cup member are given different local qualities through varying tooth lengths and configurations. The first, second, and third teeth have progressively increasing lengths to create localized engagement zones. Additionally, flat surfaces are provided at specific locations between the teeth to create localized compression zones. This local quality variation optimizes tissue engagement at different positions while maintaining an overall simple cup member structure.
2Reliability
If the forceps pieces are made longer to improve tissue grasping, then the gripping effectiveness is improved, but the device complexity and manufacturing difficulty increase
Solution Approach 1:
The tooth structure is segmented into three distinct teeth with progressively increasing lengths rather than using a single long tooth or uniform teeth. This segmentation allows the forceps to achieve effective tissue engagement through multiple shorter engagement points rather than requiring one extremely long tooth, simplifying manufacturing while maintaining reliability.
Solution Approach 2:
The tooth lengths are optimized to specific parameter ranges with a progressive relationship (first length < second length < third length). This parameter configuration ensures that the cumulative engagement effectiveness is sufficient for reliable tissue grasping, while keeping individual tooth lengths within manufacturable ranges. The flat surfaces are also positioned at specific parameter locations to enhance compression without requiring excessive overall length.
3Reliability
If multiple teeth with different lengths are added to enhance gripping, then tissue slipping is prevented, but the manufacturing precision requirements increase
Solution Approach 1:
The anti-slipping function is achieved through segmentation into three teeth with progressively increasing lengths rather than requiring one extremely precise long tooth. The progressive length configuration creates multiple engagement zones that collectively prevent slipping, reducing the precision burden on any single tooth while maintaining overall reliability.
Solution Approach 2:
Each tooth position is given a specific local quality with a predetermined length relationship. The first tooth provides initial engagement, the second tooth provides intermediate engagement with greater length for enhanced grip, and the third tooth provides final engagement with the greatest length. Flat surfaces are added at specific local positions between the teeth to create compression zones. This local quality differentiation achieves anti-slipping performance through the collective action of multiple features rather than requiring extreme precision from a single feature.
Data Source
AI summary
An endoscope treatment tool includes: a forceps having a first forceps piece and a second forceps piece; and a joint. The second forceps piece includes a forceps cup, a first tooth, a second tooth, a third tooth, a fourth tooth. A length from a tip of the first tooth to a tip of the second tooth in a longitudinal direction defines a first length, a length from the tip of the first tooth to a tip of the third tooth in the longitudinal direction defines a second length, and the first length is shorter than the second length. A length from the tip of the first tooth to a tip of the fourth tooth in the longitudinal direction defines a third length and the second length is shorter than the third length.