Stent Retention Wire for Longitudinal Movement Control
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Solution Overview
Problem
Conventional balloon-expandable stent delivery systems face issues with unintended longitudinal movement of the stent relative to the balloon during inflation, which can damage components like drug coatings and biologic materials, and require high heat and pressure for securement, potentially causing damage.
Innovation Solution
A retention wire is used to restrain the stent on the balloon, extending along its length and coupled to the catheter at both ends, allowing the stent to expand without needing to be heated and pressurized to the same extent as conventional methods, thereby reducing damage and maintaining securement during inflation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional balloon-expandable stent delivery systems are used, then the stent can be expanded to treat stenosis, but the stent experiences unintended longitudinal movement relative to the balloon during inflation, causing damage to components like drug coatings and biologic materials
Solution Approach 1:
The patent applies preliminary action by securing the stent to the balloon catheter before inflation occurs. The stent is crimped onto the balloon and positioned in advance, preventing longitudinal movement during the subsequent inflation process. This preliminary securing action eliminates the harmful relative motion that would otherwise damage drug coatings and biologic materials on the stent.
2Strength
If high heat and pressure are applied to secure the stent to the balloon, then the stent is firmly attached, but components like drug coatings and biologic materials may be damaged
Solution Approach 1:
The patent applies parameter changes by modifying the physical state of the stent through crimping to a compressed configuration. The stent is transformed from its expanded functional shape to a compressed delivery state, allowing it to be securely attached to the balloon without requiring high heat and pressure that would damage sensitive coatings and biologic materials. The crimped stent maintains adequate attachment strength through this parameter transformation.
3Device complexity
If the stent is allowed to move longitudinally during balloon inflation, then the delivery system is simpler, but the stent may shift position causing damage to components and compromising implantation precision
Solution Approach 1:
The patent applies preliminary action by pre-securing the stent to the balloon catheter in the correct position before delivery and inflation. The stent is crimped and attached in advance, ensuring it remains at the precise intended location during balloon expansion. This preliminary positioning action maintains implantation precision without requiring complex delivery system structures.
Data Source
AI summary
A delivery system is provided with a balloon catheter having a stent mounted thereon. A retention wire is provided to restrain the stent on the balloon of the balloon catheter. The retention wire is coupled to the catheter adjacent the distal end of the stent and adjacent the proximal end of the stent. The retention wire extends along the length of the stent adjacent the outer surface thereof. Thus, the retention wire may restrain the stent from moving longitudinally during inflation of the balloon.