Pull Wire Slack Section Prevents Premature Embolic Coil Detachment
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Solution Overview
Problem
Current embolic coil delivery systems face challenges with premature detachment and improper positioning due to tortuous vasculature, leading to potential blood flow obstruction and clot formation issues.
Innovation Solution
A detachment system with a pull wire featuring a slack section that allows independent movement of the proximal portion, preventing premature retraction and ensuring accurate deployment of embolic coils by maintaining the distal end's position until the desired location is reached.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a mechanical detachment system with a pull wire is used to release embolic coils, then the implant can be deployed at the target location, but premature proximal movement of the pull wire can cause premature release of the coil before reaching the treatment site
Solution Approach 1:
The pull wire is designed with a dynamic configuration including a slack section that allows controlled movement. The slack section enables the pull wire to accommodate tortuous vasculature and prevent premature proximal movement while still allowing intentional deployment when needed
Solution Approach 2:
The pull wire's physical state is changed by introducing a slack section with specific length and configuration. This parameter change allows the wire to transition from a taut, potentially premature-moving state to a controlled state where the distal end remains stable until intentional deployment
2Reliability
If the pull wire is pulled proximally to deploy the implant, then the embolic coil is released, but the system cannot be repositioned once the coil is implanted
Solution Approach 1:
The system is designed to perform the deployment action only when intentionally triggered. The slack section prevents any accidental or premature proximal movement, ensuring that the coil remains in place until the physician intentionally pulls the pull wire to deploy it
Solution Approach 2:
The slack section acts as an intermediary element between the proximal and distal ends of the pull wire. It absorbs unintended movements while transmitting intentional deployment forces, serving as a mediator that protects against premature release while enabling controlled deployment
3Reliability
If embolic coils are used to fill the aneurysm sac or treat the neck, then blood flow can be controlled, but improper positioning can impede blood flow in the adjoining vessel or cause clot formation
Solution Approach 1:
The system provides visual feedback through radiopaque markers that allow the physician to monitor the position of the embolic coil and pull wire in real-time. This feedback mechanism enables precise positioning and prevents improper placement that could cause blood flow obstruction or clot formation
Data Source
AI summary
A detachment system for delivering an embolic coil implant to a treatment site is provided. A pull wire through a lumen of the detachment system that engages a loop wire can include a slack section. The slack section can be one or more bends, a spiral coil, or a stretchable material. The slack section is effective to inhibit premature detachment of the implantable medical device by inhibiting movement of the distal end of the pull wire when the detachment system is traversing a microcatheter.