Asymmetric Self-Expanding Deployment Wires for Minimally Invasive Patch Placement
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Solution Overview
Problem
Current methods for deploying patches within the body, such as for treating aortic tears, require large incisions and cause significant trauma due to the need for a large headspace around the catheter for expansion, limiting minimally invasive procedures.
Innovation Solution
A patch deployment device with a pusher wire and deployment wires that self-expand from an unexpanded state within a catheter to an expanded state, featuring an asymmetric form allowing efficient deployment with reduced headspace requirements, enabling secure patch application with tailored pressure distribution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If a traditional symmetric deployment structure is used, then the device can be deployed, but it requires a large amount of headspace around the catheter for expansion
Solution Approach 1:
The deployment wires are designed with an asymmetric cross-sectional shape (e.g., D-shaped, oval, or irregular polygon) instead of symmetric circular shapes. This asymmetry causes the wires to experience asymmetric forces during self-expansion, generating a rotational component that allows the device to deploy in a compact space with minimal headspace requirements around the catheter.
2Length of moving object
If a self-expanding deployment wire structure is used, then the device can be deployed through minimal incision, but it requires a large headspace for expansion
Solution Approach 1:
The asymmetric cross-sectional geometry of the deployment wires enables compact self-expansion by creating rotational movement during deployment. This allows the device to maintain the benefit of self-expansion (minimal incision requirement) while eliminating the drawback of large headspace requirements, as the asymmetric shape guides the expansion in a controlled rotational manner within limited space.
3Device complexity
If symmetric deployment wires are used, then the structure is simple, but it requires more headspace and does not provide tailored pressure distribution
Solution Approach 1:
The asymmetric cross-sectional shape of the deployment wires adds geometric complexity but actually simplifies the overall deployment process by enabling rotational expansion. This single geometric modification simultaneously reduces headspace requirements and enables tailored pressure distribution across the patch, while maintaining relatively simple wire construction.
Solution Approach 2:
The asymmetric wire geometry creates localized variations in expansion characteristics, allowing different regions of the deployed device to apply different pressures. This enables tailored pressure distribution across the patch surface, with specific areas experiencing higher or lower pressures based on the local wire geometry and expansion dynamics.
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 device minimizes trauma by allowing minimal incision deployment and ensures secure patch application with tailored pressure, enhancing adhesion and reducing the required headspace for patch placement.
Implementation Method 1
configured to be in an unexpanded state when positioned and constrained within a catheter, and configured to self-expand into an expanded state when positioned beyond a distal end of the catheter and not constrained
Implementation Method 2
configured to self-expand into an expanded state when positioned beyond a distal end of the catheter
Data Source
AI summary
The present invention provides a patch deployment device, the device comprising a pusher wire having a proximal end and a distal end; a plurality of deployment wires, wherein each deployment wire: has a first end and a second end, and the first end and the second end are connected to the distal end of the pusher wire; and is configured to be in an unexpanded state when positioned and constrained within a catheter, and configured to self-expand into an expanded state when positioned beyond a distal end of the catheter and not constrained, wherein in the expanded state at least a portion of the wire is positioned substantially within a plane that is substantially perpendicular to the longitudinal axis of the pusher wire and has an asymmetric form when viewed along a direction parallel to the longitudinal axis of the pusher wire.