Embolic Coil Detachment Handle With Widened Hypotube Release
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Solution Overview
Problem
Existing detachment systems for embolic coils in endovascular procedures suffer from time delays, complexity, and mechanical failures, posing risks during aneurysm treatment.
Innovation Solution
A delivery system with a pivotable handle and a hypotube design featuring olive-shaped enlarged ends that allow for quick, reliable mechanical detachment of the coil from the wire, minimizing risks through a self-contained mechanism.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If electrolytic detachment is used, then the coil can be detached from the wire, but the process takes time which could be critical if the aneurysm ruptured and bleeding starts
Solution Approach 1:
The patent replaces electrolytic detachment (thermal/chemical process) with a purely mechanical detachment system. The mechanical detachment device includes a cutting element that mechanically severs the coil from the wire through direct mechanical action, eliminating the time delay inherent in electrolytic processes while maintaining reliable detachment.
Solution Approach 2:
The patent extracts the detachment function from the delivery system by using a separate, dedicated mechanical detachment device. This detached detachment mechanism can be applied independently to any coil-delivery system, providing rapid mechanical severing without requiring the coil to be part of the delivery system's primary structure.
2Reliability
If mechanical detachment systems use wire finger snip technique, then the coil can be detached, but the applied longitudinal force could lead to collapse of last loop at the parent artery
Solution Approach 1:
The patent introduces an intermediary cutting element that selectively severs the coil from the wire without applying longitudinal force to the coil itself. The cutting element acts as a mediator that performs the detachment function while preventing harmful forces from being transmitted to the coil structure, thus avoiding loop collapse at the parent artery.
Solution Approach 2:
The patent segments the detachment process by using a dedicated cutting element that isolates the severing action from the rest of the system. This segmented approach allows the coil to be detached without the entire coil structure being subjected to longitudinal forces, preventing collapse while maintaining detachment reliability.
3Reliability
If separate detachment handles are used, then the coil can be detached from the wire, but the cost and complexity increase
Solution Approach 1:
The patent makes the mechanical detachment device universal by designing it as a separate, standalone unit that can be applied to any coil-delivery system. This universal detachment device eliminates the need for different detachment handles for different systems, reducing overall complexity while maintaining detachment capability across all applications.
Solution Approach 2:
The patent extracts the detachment function as a separate, independent device rather than integrating it into the delivery system. This extraction allows the detachment mechanism to be optimized independently and applied universally, reducing the complexity that would arise from having different integrated handles for different delivery systems.
Data Source
AI summary
A delivery system for an embolic coil has a hypotube having a proximal end that is connected to the handle housing, with the hypotube having a lumen extending from the proximal end to a distal end of the hypotube. The lumen has a first diameter and a widened section that has a second diameter that is greater than the first diameter. A first wire has a first enlarged end provided at the proximal end of the first wire and an embolic coil provided at the distal end of the first wire. A second wire has a second enlarged end provided at the distal end of the second wire and with the proximal end of the second wire connected to the pivotable element. The wires and their enlarged ends extend inside the lumen of the hypotube. Pulling the second wire in a proximal direction causes the first and second enlarged ends to disengage when the first and second enlarged ends are both in the widened section.