Hook Wire Retention for Premature Embolic Implant Detachment
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Solution Overview
Problem
Current catheter-based delivery systems experience premature detachment of implants due to increased friction between the pull wire and delivery system as they navigate tortuous vasculature, leading to improper deployment of medical devices.
Innovation Solution
A detachment system featuring a tubular body with a loop wire and hook wire configuration that provides frictional resistance between the pull wire and the distal tube, inhibiting premature detachment by securing the implant to the delivery system through a loop opening and tensioned hook wire.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a pull wire is used to retain the implant in the catheter, then the implant can be delivered through the vasculature, but the friction between the pull wire and delivery system increases in tortuous vasculature causing premature detachment
Solution Approach 1:
The retention system is divided into multiple functional segments: a retention member with engagement features that interfaces with the implant, a pull wire for actuation, and a friction reduction member that segments the interaction between the pull wire and delivery system. This segmentation allows each component to perform its specific function while collectively preventing premature detachment.
Solution Approach 2:
A friction reduction member is introduced as an intermediary component between the pull wire and the delivery system. This intermediary reduces the harmful frictional forces that cause premature detachment while still allowing the pull wire to effectively retain and deploy the implant when needed.
2Reliability
If the delivery system is made more secure to prevent detachment, then implant retention improves, but the system complexity increases
Solution Approach 1:
The retention member and friction reduction functionalities are merged into a single integrated component structure. The retention member incorporates both the engagement features for securing the implant and the friction reduction surfaces for minimizing interaction with the delivery system, thereby improving retention without proportionally increasing complexity.
Solution Approach 2:
The retention member is designed with multi-functionality, serving both to securely retain the implant through engagement features and to reduce friction against the delivery system. This universal component performs multiple functions simultaneously, avoiding the need for separate dedicated components for each function.
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 implants by maintaining secure attachment during navigation through tortuous vasculature, ensuring accurate delivery to the treatment site.
Implementation Method 1
The frictional resistance can be effective to inhibit premature detachment of the implant
Data Source
AI summary
Various systems and methods of delivering an implant to a target location of a body vessel are disclosed. A detachment system can include a tubular body including a lumen extending therethrough and a distal tube on a distal end of the tubular body. A loop wire can be affixed at a first end to the tubular body and can include a loop opening positioned approximate a distal end of the distal tube. A pull wire can extend through the lumen. A hook wire can extend radially through a sidewall of the distal tube and into the lumen. The hook wire can be positioned around a pull wire portion and tensioned such that the pull wire portion abuts the distal tube and provides frictional resistance between the pull wire portion and the sidewall of the distal tube. The frictional resistance can be effective to inhibit premature detachment of the implant.