Endoscopic Cutting Wire Segmentation for Stable Knife Exposure
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Solution Overview
Problem
Endoscopic cutting devices face issues with cutting wire breakage or disengagement due to improper tension control during endoscopic sphincterotomy procedures, requiring extensive operator experience.
Innovation Solution
The endoscopic cutting device features a cutting wire with separate bending and rotation segments, each with dedicated limiting members, dispersing forces to prevent stress concentration and improve stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the cutting wire is pulled to bend the sheath tube, then the electrosurgical knife is exposed to cut the duodenal sphincter, but the cutting wire is easily broken or disengaged due to uncontrolled tension
Solution Approach 1:
The cutting wire is divided into multiple functional segments: a rotation-resistant segment with enlarged cross-section, a cutting segment, and a bending segment. This segmentation allows different portions to handle different mechanical stresses independently, preventing wire breakage while enabling proper exposure and operation of the electrosurgical knife.
Solution Approach 2:
The rotation-resistant segment has an enlarged cross-sectional area compared to other segments, creating localized structural reinforcement. This local quality change provides enhanced resistance to rotational forces and tension at the critical region where the wire exits the sheath tube, preventing disengagement and breakage.
2Ease of manufacture
If the cutting wire has uniform structure, then the device is simple to manufacture, but the wire cannot resist both bending and rotation forces simultaneously
Solution Approach 1:
The cutting wire is constructed with distinct segments having different functional properties. The rotation-resistant segment with enlarged cross-section is positioned at the critical exit region, while other segments maintain smaller dimensions. This segmentation enables the wire to resist both bending and rotation forces simultaneously while remaining manufacturable through standard wire forming processes.
Solution Approach 2:
Rather than making the entire wire uniformly thick, the enlargement is applied locally only to the rotation-resistant segment. This localized quality change provides the necessary mechanical strength at the critical region while keeping the overall wire structure simple and manufacturable.
Data Source
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AI summary
An endoscopic cutting device is provided. The endoscopic cutting device includes an operating portion, a sheath tube including an injection lumen and a cutting wire lumen, a proximal end of the sheath tube being connected to the operating portion; and a cutting wire at least partially disposed within the cutting wire lumen, a proximal end of the cutting wire being connected to the operating portion. The cutting wire includes a cutting segment extending out of the sheath tube from a sidewall of the sheath tube to form a knife portion for performing a surgical operation.