Endoscope Treatment Tool Guide Wire Insertion Mechanism
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Solution Overview
Problem
Conventional endoscope treatment tools with multi-lumen sheaths face difficulties in smoothly inserting guide wires due to increased lumen numbers or larger diameters, leading to poor workability and difficulty in advancing the guide wire into the guide wire lumen.
Innovation Solution
A treatment tool design featuring a multi-lumen sheath with a guide wire lumen and a slit system, including a first slit for easy insertion and removal, and a sheath-retaining part with intersecting side cut surfaces and an axially cut surface to facilitate guide wire insertion and prevent deviation, improving the guide wire's path into the lumen.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the number of lumens in the multi-lumen sheath is increased to provide more functional channels, then the versatility and functionality of the treatment tool is improved, but the difficulty of inserting the guide wire into the guide wire lumen increases
Solution Approach 1:
The guide wire insertion path is segmented into multiple controlled openings: a first opening at the proximal end for initial insertion, and a second opening at the distal end for final access. This segmentation allows the guide wire to be inserted through a larger proximal opening and then guided through the multi-lumen structure to the distal opening, making insertion easier despite the increased number of lumens
Solution Approach 2:
A slit is introduced as an intermediary structure that connects the first opening and the second opening. The slit acts as a guide channel that receives the guide wire at the proximal end and directs it through the multi-lumen sheath to the distal end, facilitating smooth insertion even when multiple lumens are present
2Adaptability or versatility
If a conventional multi-lumen sheath design is used with increased lumens or larger diameters, then the functional capacity is improved, but the workability and operability of the treatment tool deteriorates
Solution Approach 1:
The sheath structure is segmented with distinct openings at different locations: a first opening at the proximal end portion and a second opening at the distal end portion. This segmentation allows operators to insert the guide wire through the proximal opening and have it emerge at the distal opening, maintaining ease of operation despite increased functional capacity
Solution Approach 2:
A slit structure serves as an intermediary guide that connects the proximal and distal openings. This slit receives and guides the guide wire through the multi-lumen sheath, ensuring smooth passage and preventing deviation, thereby maintaining high workability
Data Source
AI summary
A treatment tool includes a second sheath (12) having a slit (12e) through which a guide wire is configured to be taken in and out of a first lumen, and a sheath-retaining part having a guide wire insertion opening (20b) having a slit (20c) and a main opening (20d), wherein a first end portion of the second sheath (12) has a first side cut surface (12g) and a second side cut surface (12h) intersecting in an X-shape, an axially cut surface formed by cutting in parallel to a central axis (O12) from an end surface (12k), an opening surrounded by the first side cut surface (12g), the second side cut surface (12h), and the axially cut surface and communicating with the first lumen at a position overlapping the main opening (20d), and a piece-like part.