Inflatable Embolic Protection Frame with Shape Memory
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Solution Overview
Problem
Current embolic protection devices face challenges in minimizing cross-sectional profile during delivery and retrieval to prevent emboli release and escape, especially during stenosis procedures like carotid artery treatment, where the risk of blood clots and thrombi being released into the blood flow is high.
Innovation Solution
An embolic protection device with an inflatable frame that collapses to a reduced state for delivery and retrieval, featuring a shape memory material that expands to a predetermined shape for emboli capture, allowing for a smaller cross-sectional profile and efficient trapping of emboli during angioplasty.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the embolic protection device is delivered in an expanded state to capture emboli, then the emboli capture capability is improved, but the cross-sectional profile increases causing contact with the stenotic lesion and risk of emboli release
Solution Approach 1:
The embolic protection device employs a shape memory alloy frame that can dynamically change its configuration between an expanded capture state and a compressed delivery state. The frame transitions from a first configuration with a larger cross-sectional profile for emboli capture to a second configuration with a smaller cross-sectional profile for delivery, allowing the device to adapt its shape based on operational requirements
Solution Approach 2:
The device utilizes shape memory alloy material properties to change physical parameters (shape, size, cross-sectional profile) in response to temperature or stress changes. The frame material transforms between different crystalline structures to enable reversible shape changes, allowing the device to transition between expanded and compressed states without losing structural integrity
2Object-affected harmful factors
If the device is compressed to a small profile for delivery, then the risk of emboli release during insertion is reduced, but the emboli capture capability is compromised
Solution Approach 1:
The embolic protection device employs a shape memory alloy frame that can dynamically change its configuration between an expanded capture state and a compressed delivery state. The frame transitions from a first configuration with a larger cross-sectional profile for emboli capture to a second configuration with a smaller cross-sectional profile for delivery, allowing the device to adapt its shape based on operational requirements
Solution Approach 2:
The device is delivered in a compressed state through the catheter to the treatment site, then expanded to the capture state once positioned. This preliminary compression allows safe delivery without emboli release risk, while the subsequent expansion enables effective emboli capture at the target location
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 effectively reduces the risk of emboli release during insertion and retrieval by maintaining a small cross-sectional profile and ensuring emboli are trapped during the procedure, enhancing safety and efficacy in capturing emboli within the body vessel.
Implementation Method 1
featuring a shape memory material that expands to a predetermined shape for emboli capture
Implementation Method 2
collapses to a reduced state for delivery and retrieval, allowing for a smaller cross-sectional profile
Data Source
AI summary
An embolic protection device for capturing emboli during treatment of a stenotic lesion in a body vessel is provided. The device includes an inflatable frame having a deployed state and an undeployed state and a filter attached to the inflatable frame for capturing emboli. The inflatable frame includes a distal portion having a predetermined shape and extending freely to a closed distal end when the inflatable frame is in the deployed state. The filter includes a lip attached to the inflatable frame to define an open end of the filter when the inflatable frame is in the deployed state, a body extending from the lip and disposed about the inflatable frame, and a closed tail configured to capture the emboli during treatment of the stenotic lesion.