Braid Implant Delivery Wire With Distal Pusher Bump
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Solution Overview
Problem
Existing stent deployment systems face challenges in efficiently deploying and retracting self-expanding stents in vascular treatments, particularly in tiny vessels, due to axial compression and radial expansion issues, and require complex delivery wire mechanisms that can cause implant mispositioning and increased manufacturing complexity.
Innovation Solution
A delivery system utilizing a delivery wire with at least three bump members - a distal puller bump, an intermediate retractor bump, and a proximal pusher bump - to minimize wire travel during deployment and retraction, allowing for efficient deployment and repositioning of long stents with reduced risk of implant disturbance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single dual-function bump member is used on the delivery wire to deploy and retract the implant, then the number of members is reduced, but the delivery wire must travel substantial lengths during deployment and repositioning which increases the likelihood of disturbing deployed portions of the implant
Solution Approach 1:
The delivery wire is segmented into multiple bump members (distal pusher bump, intermediate puller bump, proximal pusher bump) distributed along its length. Each bump member is positioned at specific locations to perform distinct functions during deployment and retraction, eliminating the need for the delivery wire to travel substantial lengths and reducing the risk of disturbing deployed implant portions.
2Ease of operation
If force is applied in a distal direction on the proximal end of the stent to push the device forward, then the stent can be delivered to the treatment site, but the stent experiences axial compression and radial expansion which can alter its position
Solution Approach 1:
Instead of pushing the stent from the proximal end, the distal pusher bump member pushes the distal end of the stent in the distal direction. This inverted approach eliminates axial compression and radial expansion of the stent during delivery, maintaining precise positioning while still enabling delivery to the treatment site.
3Manufacturing precision
If multiple members are added to the delivery wire to improve deployment control, then deployment precision improves, but the manufacturing complexity increases as more material must be used to add and secure members
Solution Approach 1:
Multiple functional elements (delivery wire, multiple bump members, catheter, expandable element) are merged into a single integrated delivery system. The bump members are positioned at specific locations along the delivery wire to perform multiple functions (pushing, pulling, retracting) without requiring separate delivery wires or complex assembly procedures, thus improving deployment precision while maintaining ease of manufacture.
Data Source
AI summary
A braid implant delivery and retraction device having a catheter, an expandable element and a delivery wire with distal, pusher, and recapture bumps. The expandable element having compressed, partially delivered, and implanted configurations. Delivering the braid can include engaging the distal bump till the braid is in the partially delivered configuration. If the user needs to recapture the braid, the recapture bump engages the braid proximally. To fully implant the braid, the distal bump is used until the braid is partially delivered and the distal bump disengages, now the pusher bump completes implanting by proximally pushing the braid completely out of the catheter.