Stent Delivery System Elastic Member Clamping
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Self-expanding stents in stent delivery systems face challenges with precise positioning due to their self-expanding property, which can lead to jumping out of the delivery tube, making it difficult to re-contain and accurately place the stent at the target site.
Innovation Solution
A stent delivery system that includes a self-expanding stent compressed during insertion, an inner tube with a guide wire lumen, and an elastic member to clamp the stent between the inner and outer tubes, preventing unguarded jumping and allowing for re-containment and precise positioning by sliding the outer tube relative to the inner tube.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a self-expanding stent is contained in a stent-containing tube body, then the stent can be inserted into the living body, but the stent may jump out unguardedly due to its self-expanding property
Solution Approach 1:
The elastic member is pre-loaded to exert a pressing force on the stent in the compressed state, creating a preliminary counteracting force against the stent's self-expanding tendency. This preliminary anti-action prevents the stent from jumping out unguardedly during insertion while maintaining ease of operation.
Solution Approach 2:
The elastic member is pre-compressed between the inner tube body and stent-containing tube body before stent deployment, storing elastic potential energy. This preliminary action ensures that the stent is securely held during insertion and only releases when intentionally deployed, improving both ease of operation and positioning control.
2Manufacturing precision
If the stent is allowed to expand automatically, then the placement positioning is difficult to control, but if the stent is constrained, then it cannot be inserted
Solution Approach 1:
The system transitions from a static constrained state during insertion to a dynamic controlled expansion state at the target site. The elastic member provides continuous pressing force that can be dynamically released, allowing precise positioning control while maintaining ease of insertion through the slidable tube body mechanism.
Solution Approach 2:
The elastic member acts as an intermediary between the stent's self-expanding force and the tube body constraint. It provides controlled resistance during insertion and enables precise positioning, while the slidable tube body mechanism serves as an intermediary to translate operator motion into controlled stent deployment.
3Reliability
If the stent jumps out of the stent-containing tube body, then the stent can be deployed, but it is difficult to re-contain the stent
Solution Approach 1:
The elastic member provides continuous feedback force on the stent, maintaining contact and control throughout the deployment process. This feedback mechanism allows the operator to sense stent position and make adjustments, enabling easy re-containment if needed while ensuring reliable deployment when intended.
Solution Approach 2:
The system allows temporary release of the stent from the tube body for positioning adjustments, then enables recovery by sliding the tube body back to re-contain the stent. The elastic member maintains its pressing force throughout, facilitating both deployment and re-containment operations.
4Ease of operation
If the stent is compressed for insertion, then it can be inserted into the living body, but the stent needs to be expanded at the target part
Solution Approach 1:
The stent utilizes its own self-expanding property to deploy at the target site without requiring an external expansion mechanism. The elastic member simply needs to release its pressing force, allowing the stent to automatically expand to its intended configuration, simplifying the overall device complexity while maintaining ease of insertion.
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 effectively inhibits stent jumping and enables reliable placement and re-positioning of the stent at the target site, ensuring accurate deployment and correction of the stent's position.
Implementation Method 1
an elastic member (5) which presses the stent (10) in a direction toward the stent-containing tube body (2)
Implementation Method 2
the stent (10) having a hollow shape, compressed toward a center axis of the stent (10) during insertion into a living body, and restorable to its pre-compression shape by expanding outward when indwelled in the living body
Data Source
AI summary
A stent delivery system includes a self-expanding stent, an inner tube body which has a guide wire lumen, and a sheath which has the stent contained within the tip section thereof. The stent can be discharged by moving the sheath to the base end side relative to the inner tube body. The inner tube body is provided at a position within the base end section of the stent and is provided with an elastic member for pressing the stent in the direction to the sheath. The stent is gripped by the elastic member and the sheath and is adapted to be slidable relative to the sheath.