Stent Delivery Wire Segmented Windings for Repositioning
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Solution Overview
Problem
Current implantable medical endoprosthesis delivery systems face challenges in delivering and deploying stents in small-diameter lumens and navigating tortuous body pathways, with limitations in repositioning and removing the stent after partial deployment.
Innovation Solution
The system employs a delivery wire and catheter configuration with deformable seating members and a coating to maintain stent position, allowing partial deployment and retraction, and features a bullet-shaped tip and windings for flexibility and precise placement, enabling the stent to be repositioned or removed.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the delivery system uses a rigid structure to maintain stent position, then stent positioning accuracy is improved, but the system flexibility and ability to navigate tortuous pathways deteriorates
Solution Approach 1:
The delivery system is divided into multiple segments including a proximal portion, intermediate portion, and distal portion, where each segment can independently flex and move. The windings are segmented along the length of the delivery wire, allowing each section to conform to tortuous pathways while maintaining overall structural integrity for precise stent positioning.
Solution Approach 2:
The delivery system incorporates flexible windings that wrap around the delivery wire, creating a flexible yet controllable structure. These windings allow the system to navigate tortuous pathways while maintaining enough structural support for accurate stent deployment through the catheter.
2Length of moving object
If the outer diameter of the delivery system is reduced to microcatheter size, then the ability to deliver to small-diameter lumens is improved, but the system strength and stability deteriorate
Solution Approach 1:
The delivery system uses composite construction combining a flexible delivery wire with windings made of different material properties. The wire provides tensile strength and structural support, while the windings provide flexibility and conformability. This composite structure enables the system to maintain adequate strength despite the reduced outer diameter required for microcatheter delivery.
Solution Approach 2:
The windings are segmented along the length of the delivery wire, with different portions having different degrees of flexibility. This segmentation allows the system to maintain strength where needed for stent support while having flexible sections that can navigate small lumens and tortuous pathways.
3Reliability
If the stent is fully deployed before retraction, then the deployment completeness is improved, but the ability to reposition or remove the stent deteriorates
Solution Approach 1:
The system allows partial deployment of the stent before final positioning, enabling the operator to adjust the stent position or remove it if necessary. The friction fit between the stent and seating members is designed to hold the stent in a partially deployed state, allowing preliminary actions to be taken before complete deployment.
Solution Approach 2:
The friction fit between the stent and seating members is designed to be dynamic, allowing the stent to be held in various degrees of deployment. The seating members can maintain the stent in a partially deployed state through controlled friction, enabling repositioning or removal before final deployment is completed.
4Stability of the object's composition
If deformable seating members are used to maintain stent position, then the stent positioning stability is improved, but the system complexity increases
Solution Approach 1:
The deformable seating members are designed to automatically adjust and maintain the stent in position through friction fit without requiring external control mechanisms. The seating members self-regulate the stent position through their deformable properties, providing stability without adding complex control systems.
Data Source
Figure 1~2A
Figure 2B~2C
Figure 3A~3B
AI summary
Implantable medical endoprosthesis delivery systems and articles are provided.