Dual-Membrane Embolic Filter for Particle Capture and Retrieval
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Solution Overview
Problem
Existing embolic protection filters are inadequate in effectively blocking and recovering embolic particles during cardiac interventional surgery, leading to a high risk of cerebral embolism.
Innovation Solution
An anti-embolism filter comprising a stent and a filter membrane with an inner and outer membrane, forming an accommodation space to capture and retain embolic particles, which can switch between contracted and expanded states for delivery and retrieval.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single-layer filter membrane is used, then the device structure is simple, but the embolic particle recovery effect is insufficient
Solution Approach 1:
The filter membrane is divided into multiple independent layers (first filter membrane, second filter membrane, third filter membrane) with different pore sizes. Each layer captures embolic particles of different dimensions, with larger particles trapped by outer layers and smaller particles captured by inner layers with finer pores, achieving comprehensive particle recovery while maintaining structural organization
Solution Approach 2:
The filter membranes are arranged in a nested configuration where the first filter membrane with larger pores is positioned outermost, the second filter membrane with medium pores is positioned in the middle, and the third filter membrane with smallest pores is positioned innermost. This nested structure allows progressive filtration from large to small particles, maximizing recovery efficiency
2Reliability
If the filter membrane has small pores to block small particles, then particle blocking capability improves, but blood flow resistance increases
Solution Approach 1:
The filtration function is segmented across multiple layers with progressively smaller pores. The first layer with larger pores handles the bulk of particle interception with minimal flow resistance, while subsequent layers with smaller pores capture finer particles. This segmentation allows the system to achieve comprehensive particle blocking without any single layer creating excessive flow resistance
Solution Approach 2:
Different regions of the filter assembly have different pore sizes optimized for their specific function. Outer regions have larger pores to maintain open blood flow pathways, while inner regions have smaller pores for fine particle capture. This local quality differentiation ensures that high particle blocking capability is achieved only where necessary, preserving overall blood flow
Data Source
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AI summary
The present disclosure provides an anti-embolism filter and a filtering membrane. The anti-embolism filter comprises a stent and a filtering membrane. The filtering membrane comprises an outer membrane and an inner membrane. The outer membrane is connected to the stent, the inner membrane is connected to the outer membrane, and an accommodating space is formed between the inner membrane and the outer membrane. According to the present disclosure, the filtering membrane blocks embolism particles from entering the brain via blood flow, and by means of the inner membrane and the outer membrane, the embolism particles are wrapped in the accommodating space formed by the inner membrane and the outer membrane and are thus collected and completely taken out of the body.