Pivoting Stent Attachment Mechanism for Complete Release
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current stent deployment systems often fail to achieve complete release of the stent due to the stent becoming stuck on the attachment mechanism, particularly due to twisting forces during delivery.
Innovation Solution
A delivery system with a pivoting attachment mechanism that includes a casing, a lug, and fingers to securely engage the stent, allowing the lug to pivot relative to the casing upon retraction of the delivery sheath capsule, ensuring the stent is released from the system.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a traditional attachment mechanism is used to secure the stent during delivery, then the stent can be held firmly in place, but the stent may become stuck on the attachment mechanism during deployment, preventing complete release
Solution Approach 1:
The attachment mechanism employs a pivoting lug that can rotate between engaged and disengaged positions. During delivery, the lug pivots to engage with the stent frame for secure retention. During deployment, the lug pivots again to release the stent, enabling complete disengagement and preventing entrapment.
Solution Approach 2:
The attachment mechanism is divided into separate functional components: a casing that houses the mechanism, a pivoting lug that performs the engagement/disengagement action, and fingers that contact the stent frame. This segmentation allows each component to be optimized for its specific function while enabling smooth transition between retention and release modes.
2Productivity
If the delivery sheath capsule is retracted to deploy the stent, then the stent can expand and be released, but twisting forces during delivery may cause the stent to get caught on the attachment mechanism
Solution Approach 1:
The pivoting lug is designed with a geometry and pivot mechanism that proactively prevents engagement with the stent frame during the deployment phase. As the delivery sheath capsule is retracted, the lug automatically pivots to a disengaged position, counteracting any twisting forces that might otherwise cause the stent to get caught.
3Strength
If the attachment mechanism uses a fixed structure to ensure secure engagement, then the stent can be held firmly, but the mechanism cannot accommodate twisting forces during delivery and deployment
Solution Approach 1:
The attachment mechanism transitions from a fixed structure to a dynamic pivoting system. The lug can rotate about a pivot point within the casing, allowing it to adapt to twisting forces during delivery while maintaining strong engagement with the stent frame when needed. This dynamic capability enables the mechanism to accommodate various delivery scenarios without compromising engagement strength.
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
Prevents stent entrapment by allowing the stent to be released effectively from the delivery system, ensuring complete deployment without getting caught on the attachment mechanism.
Implementation Method 1
The attachment mechanism is configured to pivot relative to the inner shaft assembly upon retraction of the delivery sheath capsule to release the stent from the delivery system
Data Source
Figure 1
Figure 2~3
Figure 4~7
AI summary
An attachment mechanism ( 120 ) for coupling a stent to a delivery system is disclosed. The attachment mechanism is configured to pivot relative to an inner shaft assembly ( 112 ) of the delivery system in order to release the stent from the delivery system.