Rapid-Exchange Stent Delivery Structure to Prevent Guide Wire Jamming
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Solution Overview
Problem
The operation of stent delivery devices is time-consuming due to guide wire protrusion and potential jamming during stent release, especially when the guide wire is clamped between the inner and outer tubes.
Innovation Solution
A rapid exchange stent delivery device with an outer tube featuring an avoiding part that guides the guide wire outlet and allows the inner tube to slide relative to the outer tube, preventing jamming and enabling smooth stent release.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the guide wire is led out from the guide wire outlet located near the distal end on the side wall of the inner tube, then the guide wire can extend out through the opening of the outer tube, but the guide wire will be clamped and fixed between the inner tube and the outer tube, causing the stent to jam during release
Solution Approach 1:
The patent extracts the guide wire outlet from the inner tube and relocates it to the outer tube. Specifically, the guide wire outlet is positioned on the side wall of the outer tube, allowing the guide wire to extend through the outer tube's opening rather than being clamped between the inner and outer tubes during stent release. This extraction eliminates the jamming problem while maintaining guide wire extendability.
Solution Approach 2:
The patent introduces an intermediary structure - the outer tube's side wall opening - as a mediator for guide wire extension. Instead of the guide wire passing through the inner tube's outlet and being trapped, the outer tube's opening serves as an intermediary pathway that allows the guide wire to extend freely without being clamped between the tubes during stent deployment and release.
2Ease of operation
If the guide wire extends along the outer tube for a long distance, then the guide wire can reach the distal end, but the operation duration of the surgery becomes relatively long
Solution Approach 1:
The patent extracts the guide wire outlet from the inner tube and positions it on the outer tube's side wall. This relocation shortens the effective guide wire length needed, as the guide wire now extends only to the outer tube's opening rather than requiring full-length extension along the entire outer tube to reach the distal end and back.
Solution Approach 2:
The patent inverts the conventional arrangement by moving the guide wire outlet from the inner tube (proximal structure) to the outer tube (distal structure). This inversion allows the guide wire to be shorter while still achieving the necessary reach, as the outer tube's side wall opening provides a direct exit point closer to the distal end.
3Ease of operation
If the inner tube slides relative to the outer tube for stent release, then the stent can be deployed, but the guide wire outlet of the inner tube intersects with the opening of the side wall of the outer tube, causing jamming
Solution Approach 1:
The patent extracts the guide wire outlet from the inner tube and relocates it to the outer tube. This extraction ensures that during inner tube sliding for stent release, the guide wire outlet of the inner tube does not intersect with the outer tube's opening, as the guide wire now exits through the outer tube's side wall opening at a different location, preventing entrapment between the tubes.
Solution Approach 2:
The patent changes the spatial dimension of the guide wire outlet from the inner tube's distal end (one dimension) to the outer tube's side wall (another dimension). This dimensional relocation ensures that the guide wire outlet and the inner tube's sliding path are separated in space, preventing intersection and entrapment during stent deployment.
Data Source
AI summary
A rapid exchange stent delivery device is provided that relates to the technical field of stent delivery. The rapid exchange stent delivery device releases a stent toward a distal end along a guide wire, and the delivery device includes: an outer tube and an inner tube inserted inside the outer tube; a guide wire inlet is arranged on a distal end of the inner tube, and a guide wire outlet is arranged on a side wall; and the outer tube has an avoiding part extending toward the distal end to avoid and guide out the guide wire extending from the guide wire outlet, so that the outer tube can move relative to the inner tube, and the inner tube pushes the stent out of the distal end of the outer tube for release.