Expandable Embolic Filter with Segmented Mesh for TAVR Debris Capture
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Solution Overview
Problem
Current embolic protection devices during transcatheter aortic valve replacement (TAVR) procedures are inadequate in capturing debris before it reaches critical organs, leading to potential strokes and organ damage, and often interfere with the procedure or are difficult to position and retrieve.
Innovation Solution
An embolic filter device with a tubular structure and expandable mesh design that can be deployed in the aorta to capture debris, allowing blood flow while preventing emboli from entering major arteries, and can be easily positioned and retrieved, with features such as narrow passages for device passage and collection pockets for debris retention.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a traditional embolic protection device is used during TAVR, then debris capture is provided, but the device interferes with the TAVR procedure and is difficult to position and retrieve
Solution Approach 1:
The filter device incorporates a dynamic structure that transitions from a compressed delivery configuration to an expanded deployed configuration. The frame includes expandable elements such as balloons or self-expanding arches that allow the filter to be delivered in a low-profile state and then expanded at the target site, enabling easy positioning and retrieval while maintaining debris capture capability
Solution Approach 2:
The filter device is divided into multiple functional segments including a distal filter portion, a proximal capture portion, and intermediate connection elements. This segmentation allows the device to be manipulated independently at different locations, facilitating easier positioning and retrieval while maintaining effective debris capture across the aortic arch
2Reliability
If the embolic filter device is designed to capture all debris, then stroke prevention is improved, but the device complexity increases
Solution Approach 1:
The filter device employs different structural characteristics in different regions: the distal portion features a fine mesh configuration optimized for capturing small debris particles, while the proximal portion has a larger mesh size for capturing larger embolic material. This localized differentiation achieves comprehensive debris capture without requiring the entire device to be overly complex
3Ease of operation
If the filter device is made to be easily retrievable, then procedural ease is improved, but the debris capture reliability may be compromised
Solution Approach 1:
The filter device incorporates a nested structure where the filter elements are arranged within a frame that allows for controlled collapse and expansion. During retrieval, the filter can be compressed into a low-profile configuration that nests within the delivery catheter, enabling easy removal while maintaining the integrity of captured debris throughout the procedure
Data Source
AI summary
An embolic filter device has a catheter portion having a front open end and a rear open end, a wire having a capture tip end, the wire for insertion into the rear open end through the catheter portion and out the front open end, a pair of expanding arms with each arm being captured within the capture tip end, and a mesh canopy connected to the pair of expanding arms.