Endoscopic Cutter Rotation Restriction Mechanism
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Solution Overview
Problem
Existing endoscopic diathermic treatment instruments face challenges in precisely resecting living tissues, particularly in maintaining the cutter section at a constant depth to avoid non-target tissue contact and ensuring accurate direction adjustment during the resection process.
Innovation Solution
The development of an endoscopic treatment instrument featuring a flexible sheath with an operation member that is axially slideable and rotatable, incorporating a direction adjusting mechanism with a rotation restriction section to control the cutter section's rotation and direction, ensuring precise positioning and orientation of the cutter section.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the cutter section is made rotatable to adjust direction, then the adaptability for resecting tissues at different orientations is improved, but the risk of contacting non-target tissue increases
Solution Approach 1:
The cutter section is designed to be rotatable relative to the insertion section, allowing dynamic adjustment of the cutting direction to match the orientation of the tissue to be resected. This dynamic adaptability enables the surgeon to optimize the cutting angle for each specific surgical scenario while maintaining control over the cutting depth and path.
Solution Approach 2:
The instrument incorporates a guide wire that extends beyond the cutter section, providing visual feedback about the insertion depth and orientation. The guide wire allows the surgeon to monitor the position and direction of the cutter section in real-time, enabling precise control and preventing contact with non-target tissue while achieving the desired cutting orientation.
2Reliability
If the cutter section is kept at constant depth to avoid non-target tissue contact, then the safety is improved, but the ability to resect tissue at varying orientations is reduced
Solution Approach 1:
The instrument is divided into functionally independent sections: the insertion section for navigation, the cutter section for tissue resection, and the guide wire for positioning and orientation control. This segmentation allows each component to perform its specific function optimally - the cutter maintains constant depth for safety while the guide wire provides orientation guidance, and the rotatable joint enables orientation adjustment without compromising depth control.
Solution Approach 2:
The guide wire acts as an intermediary element between the surgeon's control and the cutter section. It transmits the surgeon's intent regarding depth and orientation while providing visual feedback, enabling the cutter to maintain constant depth for safety while still achieving varying resection orientations through controlled rotation of the cutter section relative to the guide wire.
3Manufacturing precision
If a rotation restriction mechanism is added to control cutter section orientation, then the precision of direction control is improved, but the device complexity increases
Solution Approach 1:
The connection between the insertion section and cutter section utilizes a flexible, rotatable joint rather than a rigid mechanical restraint system. This flexible connection allows controlled rotation of the cutter section to adjust orientation while maintaining a relatively simple structure, avoiding the need for complex rotation restriction mechanisms with multiple moving parts.
Solution Approach 2:
The guide wire serves a dual function: it provides visual feedback for positioning and simultaneously acts as a mechanical guide that naturally restricts rotation to clinically necessary ranges. The guide wire's physical presence and configuration provide self-imposed rotational constraints without requiring additional active restriction mechanisms, thereby maintaining device simplicity while achieving precise direction control.
Data Source
AI summary
An engaging mechanism, which restricts rotation of a cutter section about an axis of a sheath, is provided. In accordance with an advancing/retreating operation of an operation wire by an operation slider, switching is made between a rotation restriction position where rotational restriction of the cutter section is effected by the engaging mechanism and a restriction release position where the cutter section is released from the rotation restriction position and is made rotatable about the axis of the sheath relative to the sheath.