Embolic Coil Release via Bump-Actuated Detachment Mechanism
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Solution Overview
Problem
Existing embolic coil deployment systems face difficulties in smoothly and positively releasing the embolic device at the desired location within a vessel, leading to inefficiencies in procedures.
Innovation Solution
An embolic device deployment system featuring an elongated flexible catheter with a notch section forming a second lumen, an engagement member with distal and proximal loops, and a detachment member with a bump mechanism that assists in disengaging the embolic device from the retaining ring, allowing for controlled release.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a traditional pusher member is used to release the embolic coil, then the coil can be deployed, but the release process is not smooth or positive and may cause procedural inefficiencies
Solution Approach 1:
The engagement member transitions from a static retaining state to a dynamic release state through the interaction between the detachment member bump and the engagement member loops. The bump engages with the proximal loop to pull the engagement member distally, creating a positive mechanical action that smoothly releases the coil.
Solution Approach 2:
The engagement member acts as an intermediary between the detachment member and the embolic coil. The detachment member bump interacts with the engagement member loops to transfer the release force, providing a controlled and smooth release mechanism rather than direct force application to the coil.
2Reliability
If the detachment member bump is positioned to engage the proximal loop, then controlled release is achieved, but interference between the retainer and detachment bumps must be prevented
Solution Approach 1:
The engagement member has different functional zones: the distal loop interacts with the retaining ring for coil retention, while the proximal loop interacts with the detachment member bump for release. This local differentiation of function allows controlled release without interference between the retainer and detachment bumps.
Solution Approach 2:
The engagement member is segmented into two distinct loops with different functions. The distal loop handles retention by engaging the retaining ring, while the proximal loop handles release by engaging the detachment member bump. This segmentation prevents interference between the retention and release mechanisms.
Data Source
AI summary
An embolic implantation system configured to deliver an embolic implant intravascularly to a treatment site includes an elongated delivery tube to which the embolic implant is detachably attached by a flexible loop extending through a retaining ring or opening on the embolic implant and an elongated detachment member or pull wire extending through the delivery tube and flexible loop. The pull wire has a bump near its distal end that inhibits the pull wire from moving further distally when the bump presses distally against the flexible loop and/or retaining ring. The flexible loop and retaining ring thereby serve as a distal obstruction obstructing distal movement of the bump and thereby distal movement of the pull wire into the implant.