Embolic Coil Detachment Coupler with T-Cut Proximal Interface
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Solution Overview
Problem
Detachable implants in neurovascular spaces often fail to detach properly or detach prematurely due to mechanical engagement issues, requiring constant force and restricting rotation during advancement.
Innovation Solution
A detachment coupler mechanism involving a pusher with a detachment tip and a puller, allowing mechanical control for the engagement and disengagement of an implant, such as an embolic coil, through a catheter, using a pusher wire with a tapered distal end and a proximal coupler with 'T' cuts for secure yet controlled detachment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If mechanical engagement is used to secure the implant during advancement, then the implant can be delivered through the catheter, but the implant may fail to detach or detach prematurely at the target site
Solution Approach 1:
The mechanical engagement system is segmented into distinct components: a pusher wire with detachment tip, an implant with coupler, and a catheter. This segmentation allows independent optimization of each component's detachment mechanism, improving reliability while managing complexity through modular design.
Solution Approach 2:
A detachment coupler mechanism serves as an intermediary between the pusher wire and the implant coil. This intermediary component enables controlled mechanical engagement during delivery and controlled disengagement at the target site, resolving the contradiction between secure delivery and reliable detachment.
2Stability of the object's composition
If constant force is applied by the securing member to maintain engagement, then the implant remains secured during advancement, but rotation is restricted during advancement to the target site
Solution Approach 1:
The engagement mechanism transitions from a static constant-force design to a dynamic system where the detachment tip can rotate within the coupler during advancement, then engages in a locked position at the target site. This dynamic behavior provides both rotation freedom during delivery and stable engagement at the destination.
Solution Approach 2:
The mechanical parameters of engagement change along the delivery path: the system allows rotational degrees of freedom during catheter advancement, then transitions to a fixed angular position upon detachment at the target site. This parameter change enables both ease of operation during delivery and engagement stability at the target.
3Ease of manufacture
If a simple mechanical connection is used between pusher and implant, then the device is easier to manufacture, but detachment control is insufficient at the target site
Solution Approach 1:
The detachment tip is nested within the detachment coupler during delivery, creating a compact assembly that is simple to manufacture as a single unit. The nested configuration provides inherent mechanical control for precise detachment at the target site while maintaining manufacturing simplicity through integrated design.
Data Source
AI summary
The present invention describes systems and methods using a detachment coupler mechanism of an implant assembly in delivering and detaching an implant at a target site or location within the neurovascular space/body of patient.