Stent Delivery System Stabilizer and Pusher Mechanism
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Solution Overview
Problem
Current stent delivery systems face challenges in achieving precise and secure stent placement and deployment, particularly in maintaining stent position during retraction and expansion, which can lead to incomplete vessel reinforcement and potential complications.
Innovation Solution
A stent delivery system incorporating a reinforced polymer shaft with a low friction lumen and a braided mesh sock constrained by a marker band, allowing for precise stent stabilization and secure deployment within a 3F guide system, utilizing a stent stabilizer and pusher mechanism for enhanced precision and strength.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a conventional stent delivery system is used, then the stent can be delivered to the target location, but the stent position cannot be precisely maintained during retraction and expansion
Solution Approach 1:
The delivery system is divided into distinct functional segments: an outer catheter for delivery, an inner stabilizer shaft for position maintenance, and a pusher mechanism for deployment control. This segmentation allows each component to perform its specific function optimally, with the stabilizer shaft independently maintaining stent position while the pusher controls expansion timing.
Solution Approach 2:
The stabilizer shaft acts as an intermediary component between the delivery catheter and the stent. It provides a stable platform that maintains stent position during retraction, while the low-friction lumen serves as an intermediary surface that allows smooth passage of the guidewire and controlled stent deployment without compromising position stability.
2Ease of operation
If the stent is advanced through the delivery system, then the stent can be positioned, but friction prevents easy advancement and retraction
Solution Approach 1:
The delivery system utilizes a flexible catheter construction with thin-walled segments that allow smooth stent advancement. The low-friction lumen is formed as a thin-film surface within the stabilizer shaft, reducing contact friction while maintaining structural integrity for position control.
Solution Approach 2:
The system employs parameter changes in surface properties by incorporating low-friction coatings or materials in the lumen surface. This reduces the coefficient of friction between the stent and delivery system surfaces, enabling easy advancement and retraction while the stabilizer shaft maintains positional control through its structural design.
3Reliability
If the stent is secured during delivery, then the stent position is maintained, but the stent cannot be easily deployed
Solution Approach 1:
The stabilizer shaft is designed with dynamic characteristics that allow it to maintain stent position during delivery but become disengageable during deployment. The shaft can be selectively retracted or detached from the stent, transitioning from a stable constraint to an released state that enables easy stent deployment into the vessel.
Solution Approach 2:
The stent is pre-secured to the stabilizer shaft using the low-friction lumen and constraining mechanisms before delivery. This preliminary securing action ensures position stability during navigation, and the design allows this same mechanism to facilitate controlled release and easy deployment at the target location without requiring complex additional tools.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The system ensures accurate and secure stent placement with reduced friction, facilitating easier advancement and retraction of the stent, thereby improving the precision and effectiveness of stent deployment in vascular and other bodily vessels.
Implementation Method 1
a reinforced polymer shaft with a low friction lumen
Data Source
Figure 1A~1B
Figure 2
Figure 3
AI summary
A stent delivery system, which includes a catheter and a stent stabilizer and pusher mechanism to capture and deploy a braided stent. The stabilizer pusher mechanism has a reinforced polymer shaft with two ends, a nub, a marker band and a braided mesh sock.