Catheter Operation Wire Reinforcement via Dual Tubular Layers
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing medical devices, such as catheters, face issues with operation wire operability and reinforcement around the wire, with PTL 1's blade layer placement inside the operation wire and PTL 2's operation wire being lodged between coils, leading to potential sliding difficulties.
Innovation Solution
A medical device with a flexible resin body, a sub-lumen for the operation wire, and two tubular reinforcing layers where the second layer surrounds the first, with the space between filled with resin, allowing smooth operation wire movement and adequate reinforcement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the operation wire is lodged between the outer coil and inner coil as in PTL 2, then the structure provides reinforcement around the operation wire, but the operation wire cannot smoothly slide with respect to the outer coil and inner coil
Solution Approach 1:
The patent introduces a sub-lumen as an intermediary component between the operation wire and the reinforcing layers. The sub-lumen acts as a mediator that allows the operation wire to slide smoothly while still providing reinforcement through the surrounding first and second reinforcing layers. This resolves the contradiction by decoupling the reinforcement function from direct contact with the operation wire.
Solution Approach 2:
The patent segments the reinforcement structure into two separate tubular reinforcing layers (first and second reinforcing layers) positioned at different radial distances from the operation wire. This segmentation allows the inner layer to provide close support while the outer layer provides additional reinforcement, both while allowing smooth operation wire movement through the sub-lumen.
2Ease of operation
If the blade layer is disposed only further on the radially inside of the catheter than the operation wire as in PTL 1, then the structure allows operation wire movement, but there is insufficient reinforcement around the operation wire
Solution Approach 1:
The patent extends the reinforcement structure into the radial dimension by introducing two reinforcing layers at different radial positions. The first reinforcing layer is positioned radially inside relative to the operation wire, while the second reinforcing layer is positioned radially outside, creating a multi-dimensional reinforcement zone that surrounds the operation wire without restricting its movement.
Solution Approach 2:
The sub-lumen serves as an intermediary that enables operation wire movement while the dual reinforcing layers provide comprehensive support. This mediator approach allows the operation wire to move freely within the sub-lumen while being surrounded by reinforcement structures at multiple radial levels.
Data Source
Figure 1
Figure 2
Figure 3
AI summary
An object of the present invention is to provide a medical device which has favorable operation wire, operability and has a sufficiently reinforced structure around the operation wire. The medical device of the present invention includes a medical device body; a sub-lumen which is disposed inside the medical device body so as to extend along a longitudinal direction of the medical device body; an operation wire which is inserted into the sub-lumen and extends along the longitudinal direction of the medical device body; and a first tubular reinforcing layer and a second tubular reinforcing layer. The second reinforcing layer is disposed apart from the first reinforcing layer so as to surround the periphery of the first reinforcing layer, and the space between the first reinforcing layer and the second reinforcing layer is filled with a part of a resin constituting the medical device body. The sub-lumen is disposed inside the part of the resin constituting the medical device body.