Wavy Release Wire Friction Fit for Secure Shunt Deployment
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Solution Overview
Problem
Existing shunt devices for treating elevated pressure in the left atrium, such as those used for heart failure, face challenges including paradoxical stroke risk and inadequate treatment options, particularly for diastolic heart failure.
Innovation Solution
A delivery device with an actuation arm and a wavy release wire is used to implant a shunt device in the tissue wall, featuring a wavy portion that forms a friction fit with the actuation arm, allowing secure placement and minimizing disruption to natural blood flow patterns.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a release wire is used to hold the actuation arm, then the shunt device can be securely positioned during delivery, but the release wire may inadvertently dislodge or damage the arm of the shunt device
Solution Approach 1:
The release wire is formed with a wavy configuration that acts as a flexible structure. This wavy geometry allows the wire to conform to the actuation arm without creating concentrated stress points, thereby maintaining secure positioning while minimizing the risk of dislodgment or damage to the shunt device arm during deployment
2Force
If the release wire is made straight and rigid, then it provides strong holding force, but it cannot accommodate the curvature of the delivery device and tissue wall
Solution Approach 1:
The release wire is designed with a wavy geometry featuring multiple curves and undulations along its length. This curved configuration enables the wire to adapt to the curved path of the delivery device and the natural curvature of the tissue wall, while the distributed wavy structure maintains adequate holding force through increased contact area and friction
3Ease of operation
If the release wire is made flexible and thin, then it can navigate the delivery path easily, but it lacks sufficient strength to reliably hold the actuation arm
Solution Approach 1:
The wavy geometry of the release wire creates multiple contact points with the actuation arm and delivery device along its curved path. This distributed contact configuration allows the wire to maintain adequate holding strength through cumulative friction and mechanical engagement, while the overall thin and flexible structure enables easy navigation through the delivery path
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 solution effectively reduces left atrial pressure, reduces the risk of paradoxical stroke, and provides a stable implantation mechanism for shunt devices, enhancing treatment efficacy for conditions like heart failure.
Implementation Method 1
a wavy release wire includes a wavy portion that forms a friction fit with the actuation arm
Data Source
AI summary
A delivery device for implanting a shunt device in a tissue wall includes an actuation arm extending through the delivery device, the actuation arm configured to seat an arm of the shunt device on the tissue wall, and a wavy release wire extending through the actuation arm, wherein the wavy release wire includes a wavy portion that forms a friction fit with the actuation arm.