Guide Wire Holder With Grooved Sheath for Rendezvous Capture
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Solution Overview
Problem
Existing methods for inserting a guide wire into a hollow organ, such as the bile duct or pancreatic duct, are hindered by obstacles like stenosis or occlusion at the duodenal papilla, making it difficult to perform procedures like stent placement.
Innovation Solution
A guide wire holder comprising a sheath with a groove on its outer surface, an operation wire, and a hook that protrudes from the sheath's distal end, allowing the guide wire to be captured and held securely, facilitating its insertion into the hollow organ.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a guide wire is inserted directly into the hollow organ through the duodenal papilla, then the insertion path is straightforward, but the procedure fails when the papilla is occluded or stenosed
Solution Approach 1:
A guide wire is preliminarily inserted into the hollow organ (bile duct or pancreatic duct) from a proximal side (via puncture needle) before the rendezvous procedure. This preliminary guide wire protrudes from the occluded duodenal papilla into the duodenum, providing a target for the treatment tool to capture and pull through, thus enabling successful access despite papillary occlusion
Solution Approach 2:
The protruding guide wire acts as an intermediary element that bridges the occluded papilla. It provides a physical target that the treatment tool (with guide wire holder) can capture in the duodenum and pull back through the occlusion, mediating the connection between the proximal and distal sides of the blocked papilla
2Reliability
If a treatment tool is used to capture and pull the guide wire through the occluded papilla, then access to the hollow organ is achieved, but the device complexity increases
Solution Approach 1:
The guide wire holder is nested within the treatment tool channel. The holder includes a sheath with a lumen through which the operation wire passes, and the hook is formed from the operation wire itself. This nested structure allows the complex function of capturing and pulling the guide wire to be integrated within the existing treatment tool framework
Solution Approach 2:
The hook is formed by bending the operation wire itself rather than being a separate component. This merging of the operation wire and hook reduces the number of discrete parts while maintaining the capturing function, simplifying the overall device structure
3Device complexity
If the hook is formed by bending the operation wire, then the device structure is simplified, but the hook may rotate unintentionally during operation
Solution Approach 1:
A rotation prevention portion is formed on the operation wire with an asymmetric cross-sectional shape (e.g., elliptical or flattened circular). This asymmetric shape engages with a corresponding asymmetric opening in the sheath, preventing the operation wire and attached hook from rotating unintentionally during the capturing and pulling operation
Data Source
AI summary
A guide wire holder includes a sheath having a lumen, an operation wire which is inserted through the lumen to be able to advance and retract, and a hook which is continuous with a distal end of the operation wire and protrudes from a distal end of the sheath, wherein the sheath has an inner wall surface which forms a groove configured to extend from the distal end of the sheath to a proximal end side of the sheath, the groove has an opening portion which opens to an outer peripheral surface of the sheath, the hook has a guide wire engagement surface which is engageable with a guide wire, and the guide wire is able to be held between the guide wire engagement surface and the inner wall surface.