Twisted Loop Wire Detachment for Controlled Embolic Coil Release
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Solution Overview
Problem
Current embolic coil delivery systems face challenges such as premature release due to proximal movement of the pull wire, entanglement of coils, and improper positioning, which can lead to blood flow obstruction or insufficient packing, exacerbated by tortuous vasculature.
Innovation Solution
A detachment system with a loop wire twisted around the pull wire to increase friction, preventing premature detachment by inhibiting proximal translation, and including a flexible coil and stretch-resistant fiber to secure the implant during delivery.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a mechanical detachment system with a pull wire is used to release the embolic coil, then the coil can be deployed at the treatment site, but premature proximal movement of the pull wire can cause premature release of the coil
Solution Approach 1:
A loop wire is introduced as an intermediary component between the pull wire and the embolic coil. The loop wire forms a frictional engagement with the pull wire, acting as a mediator that prevents premature proximal movement of the pull wire while still allowing controlled deployment when needed
Solution Approach 2:
The loop wire is pre-configured to engage with the pull wire before delivery, creating preliminary frictional resistance that prevents premature movement. This preliminary action ensures the pull wire remains stable during navigation through tortuous vasculature before the actual deployment action is performed
2Adaptability or versatility
If the embolic coil is delivered through tortuous vasculature, then the treatment site can be reached, but the pull wire may move proximally causing premature release
Solution Approach 1:
The loop wire serves as a mediator that maintains reliable connection between the pull wire and the embolic coil during navigation through tortuous vasculature. The frictional engagement provides continuous stabilization throughout the navigation process
Solution Approach 2:
The frictional engagement between the loop wire and pull wire is established preliminarily before navigation begins, providing ongoing prevention of proximal movement throughout the entire navigation process through tortuous vasculature
3Reliability
If multiple embolic coils are implanted to fill the aneurysm sac, then the aneurysm can be treated, but the coils can become entangled and difficult to reposition
Solution Approach 1:
The embolic treatment is segmented into multiple individually deployable coils, each with its own detachment system. This allows sequential deployment and independent positioning of each coil, reducing entanglement issues while achieving complete aneurysm filling
Solution Approach 2:
The detachment system provides dynamic control over each coil's deployment timing and position. The frictional engagement can be maintained during navigation and then released on demand, allowing flexible repositioning before final deployment
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
The system effectively prevents premature detachment of embolic coils, ensuring controlled deployment at the treatment site, reducing the risk of blood flow obstruction and improving packing efficiency.
Implementation Method 1
The loop wire can include a twist such that that the loop wire is twisted at least one time around the pull wire to increase friction between the loop wire and the pull wire
Data Source
AI summary
A detachment system for delivering an embolic coil implant to a treatment site is provided. A loop wire that is looped over a pull wire of the system can include one or more twists to increase frictional resistance against the pull wire. The additional resistance decreases likelihood of premature deployment of the embolic coil prior to the detachment system reaching the treatment site.