Telescoping Inner Lumen Support for Accurate Stent Deployment
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Solution Overview
Problem
Current catheter delivery systems for intravascular devices face issues such as kinking and entanglement of the inner luer fitting during dual motion deployment, leading to inaccurate stent placement due to the variable extension of the inner sheath out of the handle.
Innovation Solution
A dual tubular support system with a fixed inner support tube secured to the handle, where the luer fitting is connected to this tube, ensuring a fixed position and maintaining a constant inner diameter for fluid flow, while the movable inner sheath and outer sheath move in opposing directions without altering the handle's length.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the inner luer fitting is allowed to move inward during dual motion deployment, then the stent can be accurately placed in the blood vessel, but the inner lumen becomes kinked or entangled with nearby items
Solution Approach 1:
The inner support structure is divided into two separate lumens: a fixed support tube that remains stationary and a movable inner sheath that moves during deployment. This segmentation allows the luer fitting to remain fixed and avoid kinking while the movable sheath enables accurate stent placement through dual motion deployment.
Solution Approach 2:
The fixed support tube acts as an intermediary structure that provides a stable, non-moving pathway for the luer fitting. This intermediary element decouples the movement requirements of the stent deployment mechanism from the luer fitting, preventing kinking and entanglement while maintaining deployment accuracy.
2Adaptability or versatility
If the inner sheath extends out of the handle during deployment, then dual motion deployment can be achieved, but the handle length varies which complicates the deployment mechanism
Solution Approach 1:
The support structure is segmented into a fixed support tube that maintains constant handle length and a movable inner sheath that provides the necessary motion for dual motion deployment. This segmentation resolves the contradiction by separating the functions of maintaining structural stability from enabling deployment motion.
Solution Approach 2:
The solution moves the variability from the handle length dimension to the inner sheath position dimension. While the handle maintains constant length, the inner sheath moves axially within the fixed support tube, providing the required dual motion capability without compromising handle stability or increasing complexity.
Data Source
AI summary
A delivery device (10) for delivering an associated self-expanding intravascular therapy device (2) into a blood vessel includes an inner sheath (12): an outer sheath (14) having a sheath opening (16) disposed at an end thereof, the inner sheath being disposed coaxially inside the outer sheath and movable through the outer sheath: a handle (24) wherein a proximate end of the outer sheath is disposed inside the handle: a fixed support tube (26) disposed inside the handle and secured to the handle, the fixed support tube being disposed coaxially inside the inner sheath and the inner sheath being movable respective to the fixed support tube; and a gearing mechanism (28) configured to control forward movement of the inner sheath through the outer sheath and backward movement of the outer sheath in an opposing direction from the forward movement of the inner sheath.