Mechanical Detachment Embolic Coil System
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Solution Overview
Problem
Current methods for implanting embolic coils in aneurysms and arterio-venous malformations rely on electrolytic detachment, which may not provide a reliable mechanical alternative for consistent and efficient vessel occlusion.
Innovation Solution
A mechanical detachment system using a pre-tensioned stretch-resistant wire and a shape-set coil that assumes a secondary shape upon deployment, facilitated by a microcatheter and insertion tool, allowing for precise positioning and release of the coil within the aneurysm or malformation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If electrolytic detachment is used to release the coil, then the coil can be detached from the delivery system, but the method lacks reliability and consistency in vessel occlusion
Solution Approach 1:
The patent replaces the electrolytic detachment mechanism with a purely mechanical detachment system. A pusher wire with a detachment element mechanically pushes the coil off the delivery catheter at the target site, eliminating the need for electrical current and electrolytic reactions. This mechanical approach provides more reliable and consistent coil release while simplifying the overall system.
Solution Approach 2:
The patent introduces a pusher wire as an intermediary mechanical element between the operator and the coil. The pusher wire transmits mechanical force to detach the coil from the delivery system, serving as a mediator that enables controlled, reliable release without requiring electrolytic mechanisms.
2Stability of the object's composition
If a pre-tensioned stretch-resistant wire is used, then the coil maintains its shape and position, but the device complexity increases
Solution Approach 1:
The patent applies parameter changes by pre-tensioning the stretch-resistant wire during coil formation and deployment. The wire is subjected to specific tension parameters that allow it to maintain the coil's shape and resist stretching forces in the vascular environment. This controlled parameter adjustment provides shape stability without requiring overly complex structural designs.
Solution Approach 2:
The patent uses composite construction by combining the coil wire with a separate stretch-resistant wire that has different mechanical properties. The stretch-resistant wire is integrated with the coil to provide enhanced shape memory and resistance to deformation, creating a composite structure that maintains stability while managing complexity through functional specialization.
3Manufacturing precision
If multiple coils are introduced into a single aneurysm cavity, then optimal filling is achieved, but the procedure time increases
Solution Approach 1:
The patent applies segmentation by dividing the aneurysm filling process into discrete coil deployment steps. Multiple coils are introduced sequentially through the same delivery system, with each coil being precisely positioned and detached in sequence. This segmented approach allows optimal filling to be achieved while maintaining efficient procedure timing through systematic repetition of the deployment cycle.
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 ensures effective occlusion of blood flow and reinforcement of the aneurysm, preventing rupture, with improved long-term performance and reduced risk of coil compaction or misplacement.
Implementation Method 1
a pre-tensioned stretch-resistant wire
Implementation Method 2
the coil assumes a secondary shape selected to optimize filling of the aneurysm cavity
Data Source
AI summary
Embolic coil implant systems and methods whereby coils are mechanically detachable are disclosed. The coils include a retention element that may be releasably retained within the distal end of an implant tool. The implant tool may include a fulcrum configured to engage a first filament and prevent the release of the coil when the first filament is engaged. Alternatively, an urging means and aperture may be disposed within the sidewall of the implant tool, and a first filament may, in conjunction with the aperture and sidewall, releasably retain the coil until the first filament is withdrawn. The implant tool may also include an alignment member for aligning the first filament.