Push Catheter Thread Externalization for Stent Delivery
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Solution Overview
Problem
In stent delivery systems, the thread connecting the stent with the push catheter often becomes entangled with endoscopes or other instruments after the stent is released, making it difficult to extract the push catheter.
Innovation Solution
A stent delivery system design featuring a push catheter with strategically positioned passages allowing the connecting thread to be externalized and secured, preventing entanglement by configuring the thread to extend in opposite directions along the circumferential direction of the push catheter and using a closed loop shape with a knot fixed to the external surface, reducing the likelihood of the thread being cut or untied during extraction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the thread for connecting the stent with the push catheter is left inside the push catheter after stent release, then the connection is maintained, but the thread becomes easily entangled with the endoscope or other instruments
Solution Approach 1:
The connecting thread is extracted from the interior of the push catheter and positioned on the exterior surface. The thread passes through a through-hole in the push catheter wall, with both ends secured on the outside. This extraction prevents the thread from becoming entangled with the endoscope or other instruments during extraction, while maintaining reliable connection between the stent and push catheter.
2Ease of operation
If the thread is pulled out through the push catheter and connected on the external surface, then entanglement is prevented, but the thread may be cut or untied during extraction
Solution Approach 1:
The thread is pre-configured with both ends pulled through the through-hole and connected on the external surface of the push catheter before stent release. This preliminary arrangement ensures the thread is securely positioned and cannot be easily cut or untied during the extraction process, while preventing entanglement with surrounding instruments.
3Ease of operation
If the passage is located closer to the base end side than the raising base, then the thread can be externallyized, but the passage position must be precisely controlled
Solution Approach 1:
A through-hole (passage) is created at a specific location on the push catheter wall, positioned closer to the base end side than the raising base. This localized opening allows the connecting thread to pass through and be secured on the external surface, enabling thread externalization while maintaining precise positional control relative to the raising base structure.
Data Source
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AI summary
In a stent delivery system, thread connecting a stent and a push catheter is brought into a state where the thread extends in a tip direction from an opening end portion of a tip of the push catheter after the release of the stent.