Stent Delivery System with Braided Suture Detachment Mechanism
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing stent delivery systems often inadvertently alter the position of stents during detachment due to stress and motion, which can compromise the optimal positioning and implantation success.
Innovation Solution
A stent delivery system featuring braided sutures with restraining holes and a release line that allows for controlled detachment by pulling the draw lines out of the stent, minimizing interactional forces and ensuring simultaneous release at desired locations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a stent is detached from the delivery device using conventional methods, then the stent is released for implantation, but stress and motion inadvertently alter the position of the stent during detachment
Solution Approach 1:
The detachment mechanism is segmented into multiple draw lines (at least three) that can be individually controlled. Each draw line is attached to different portions of the stent, allowing sequential or simultaneous detachment of different stent sections. This segmentation enables precise control over the detachment process, minimizing stress and motion on the stent as a whole while maintaining positioning accuracy.
Solution Approach 2:
The draw lines are pre-positioned through the stent structure before detachment occurs. The delivery device is configured with the draw lines already in place, extending through the stent and accessible at the proximal end. This preliminary arrangement allows the operator to control detachment precisely when the stent is optimally positioned, preventing any inadvertent position alteration during the detachment process.
2Productivity
If the stent is detached simultaneously from the delivery device, then the release is quick, but stress and motion may still alter stent position
Solution Approach 1:
The detachment system is designed to be dynamic and adaptable. The operator can choose to pull all draw lines simultaneously for quick release, or pull them sequentially for more controlled detachment. The draw lines are configured to allow flexible manipulation, enabling the operator to adjust the detachment sequence based on the specific implantation requirements and anatomical conditions, thus maintaining precision while allowing for rapid deployment when needed.
Data Source
AI summary
Described is an apparatus for transcatheter detachment of a stent from a delivery device. A braided suture with an opening is inserted through a restraining hole in a glide (the opening is secured on one side by a knot or a series of knots) and a release line is inserted through the braided suture opening. The braided suture is thus prevented from pulling through the restraining hole while the release line is through the opening. The braided suture is free to pass through the restraining hole after the release line is pulled out of the opening and thereafter pulled free of stent holes formed through a stent, thereby detaching the stent at a desired location.