Endoscopic Treatment Tool With Large-Diameter Anti-Slip Tip
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Solution Overview
Problem
Endoscopic treatment tools with rounded rod-like cutting sections often slip during mucosal excision, complicating the procedure and requiring skilled operation.
Innovation Solution
The endoscopic treatment tool features a rod-shaped cutting section with a large diameter part at the distal end, having a semispherical part and a circular cylinder part, which engages with the tissue to prevent slipping and stabilize movement, and a tubular distal member with a through hole to ensure stable projection and retraction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a rounded rod-like cutting section is used, then the structure is simple and easy to manufacture, but the outer peripheral surface readily slips during tissue excision
Solution Approach 1:
The cutting section features a large diameter part with a specific outer diameter (0.5-1.5mm) that is larger than the inner diameter of the sheath, creating local engagement with the tissue. This local quality change at the distal end provides stable engagement while maintaining the simplicity of the overall rod-like structure
Solution Approach 2:
The invention changes the diameter parameter of the cutting section by introducing a large diameter part with an outer diameter larger than the sheath's inner diameter. This parameter change enables the cutting section to engage with the tissue effectively, preventing slippage during excision procedures
2Ease of operation
If the cutting section is freely projected or retracted, then the operation flexibility is improved, but the cutting section may separate away from the tissue
Solution Approach 1:
The cutting section is inserted into the insulating sheath, with the large diameter part extending through the sheath. The sheath acts as a protective sleeve that guides and constrains the cutting section, allowing controlled projection and retraction while preventing unwanted separation from the tissue
Solution Approach 2:
The insulating sheath serves as an intermediary between the operator and the cutting section, providing controlled mobility while maintaining stable tissue engagement. The sheath's inner diameter being smaller than the large diameter part's outer diameter creates a controlled interaction that prevents slippage
Data Source
Figure 1
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Figure 5
AI summary
A treatment tool (1) comprises a cutting section (2) which is adapted to be endoscopically inserted into a body cavity and is for performing cutting procedures to a tissue inside a body cavity through a transmission of high frequency current, a wire (3), the cutting section (2) connected at the distal end thereof, a sheath (4) consisting of an insulating material, into which the wire (3) is inserted, a main body (12), the proximal end of the sheath (4) being connected thereto, and a slider (13) to which the proximal end of the wire (3) is fixed and which is disposed to the main body (12). The cutting section (2) has a large diameter part (6) at the distal end of the cutting section (2). The treatment tool (1) further comprises a tubular distal member (9) which has a hole (11A) and is arranged on the distal end side of the sheath (4). The diameter of the hole (11A) is smaller than the outer diameter of the large diameter part (6) so that, even if the cutting section (2) is maximally retracted toward the proximal end of the sheath (4), it is impossible to house the large diameter part (6) within the hole (11A).