Releasable Top Cap Assembly for Stent Deployment
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Solution Overview
Problem
The existing delivery systems for endoluminal prostheses face challenges in preventing migration due to physiological forces, particularly pulsatile flow, which can lead to the stent or prosthesis moving downstream and failing to effectively treat the targeted vessel area, and there is a high operating effort required to remove the top cap due to interference with the stent's expansion force.
Innovation Solution
A releasable top cap assembly with a cannula, connector, and wire components that include a male and female luer lock mechanism, allowing for easy release and deployment of the stent, reducing the force needed for deployment and preventing stent migration through a bowed wire configuration and suture loops for secure anchoring.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the stent is designed with sharpened barbs to anchor to the vessel wall, then the stent's anchoring capability is improved, but the interference between the stent and top cap increases, requiring higher operating effort to remove the cover
Solution Approach 1:
The top cap is divided into a cap body and a separate bottom portion that can be selectively released. The wire components create a mechanical linkage system that allows the bottom portion to be detached independently, reducing the force needed to release the stent while maintaining secure retention during delivery.
Solution Approach 2:
The wire components act as intermediaries between the connector and the bottom portion of the top cap. These wires transmit and distribute the release force uniformly across multiple attachment points, allowing the stent to be deployed with reduced operating effort while the barbed stent maintains its anchoring function.
2Stability of the object's composition
If the top cap tightly retains the attachment stent to prevent premature deployment, then the stent's positional stability is improved, but the force required to deploy the stent increases due to high interference
Solution Approach 1:
The retention system transitions from a static tight fit to a dynamic controlled release mechanism. The wire components and connector allow the system to maintain high retention force during delivery, then dynamically switch to a low-force release state when the connector is actuated, enabling easy deployment.
Solution Approach 2:
The top cap is segmented into a stationary cap body and a movable bottom portion. This segmentation allows the bottom portion to be held securely by the wire components during delivery, then released independently through the connector mechanism, reducing the deployment force while maintaining retention stability.
3Device complexity
If the top cap is designed as a single integrated piece for simple construction, then the device complexity is reduced, but the ability to control stent deployment and reduce release force is limited
Solution Approach 1:
The top cap is divided into a cap body and a bottom portion that can be selectively released. This segmentation adds structural complexity but enables controlled deployment by allowing the bottom portion to be detached independently through the wire component mechanism, improving deployment control.
Solution Approach 2:
The wire components are disposed within the cannula, and the bottom portion of the top cap is retained within the cap body during delivery. This nested arrangement allows the complex mechanism to be compactly integrated without significantly increasing the overall device footprint, balancing complexity with functionality.
Data Source
AI summary
A releasable top cap system (34) for a delivery device having an emergency release comprises a top cap (65) having a top portion and a bottom portion (68) releasably attached to the top portion, the bottom portion having two adjacent side portions (70). A cannula (15) is positioned distal to the top cap having a proximal end and a distal end. A connector (16) is attached to the proximal end of the cannula. A pair of wire components (63) extend throughout the length of the cannula. Each wire component has a distal end and a proximal end. The proximal end of each wire component is attached to the male luer lock component and the distal end of each wire component is attached to the side portions of the top cap assembly.