Stent Proximal Loop Design Prevents Catheter Entanglement
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Solution Overview
Problem
Current stent designs for treating blood vessel diseases risk catheter entanglement with wire ends, leading to incomplete treatment or vessel damage due to insufficient stent expansion and accessibility issues.
Innovation Solution
A medical kit with a stent featuring loops at the proximal end and open wire ends at the distal end, positioned on a transport wire within an introducer, where the loops are oriented proximally to prevent catheter entanglement and ensure proper expansion, allowing for safe and complete deployment and subsequent catheter access.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the stent is designed with open wire ends at both ends for easy deployment, then the stent can be easily released from the catheter, but the catheter tip becomes caught on the wire ends during subsequent catheter insertion
Solution Approach 1:
The stent ends are segmented differently: the proximal end has closed loops while the distal end has open wire ends. This segmentation allows the distal end to remain open for easy catheter insertion while the proximal end is modified to prevent entanglement.
Solution Approach 2:
Instead of having open wire ends at both ends for uniform ease of operation, the invention inverts the approach by closing one end (proximal) with loops while keeping the other end (distal) open, thereby solving the entanglement problem while maintaining accessibility.
2Object-affected harmful factors
If the proximal stent end is designed to widen sufficiently to prevent wire end protrusion, then catheter entanglement is reduced, but the stent expansion behavior becomes uneven
Solution Approach 1:
The stent exhibits local quality differences where the proximal end has closed loops that widen to prevent wire protrusion and entanglement, while the distal end maintains open wire ends for easy catheter insertion. This localized differentiation resolves the contradiction between preventing entanglement and maintaining expansion uniformity.
3Object-affected harmful factors
If individual wires are soldered or bonded together at the ends to form loops, then catheter entanglement is prevented, but the connection points may break under stress and create open wire ends
Solution Approach 1:
The wire loops are designed to be self-formed through the manufacturing process without requiring external soldering or bonding operations. The wires are formed into loops at the proximal end through controlled deformation, eliminating weak connection points while maintaining structural integrity and preventing catheter entanglement.
Data Source
AI summary
The disclosure relates to a medical kit for treating vascular diseases, including a tubular or sleeve-type insertion aid, a transport wire having a distal tip, and a stent having a wire mesh which consists of a plurality of wires that, at a proximal stent end define loops and, at a distal stent end, open wire ends. The stent is arranged on the transport wire and together with the transport wire inside the insertion aid. The distal stent end is closer to the distal tip of the transport wire than the proximal stent end.