Braided Filter Device Fixing Force in Blood Vessels

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Solution Overview

Problem

Existing filter devices for collecting thrombi in blood vessels often have reduced fixing force, leading to potential movement or tilting within the vessel, which can cause scattered thrombi and increased risk of pulmonary embolism.

Innovation Solution

A filter device with an elastically deformable mesh-shaped expansion portion, interlocked with a shaft portion, featuring wires of varying diameters and a three-layer structure, which increases the fixing force to the biological lumen by expanding and self-restoring to improve adherence to the vessel wall.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Ease of operation

If a filter is turned back to form a cup shape, then the filter can be inserted into the blood vessel, but the fixing force to the biological lumen is reduced

Engineering Contradiction:

ImproveinsertabilityVSAvoidfixing force

Core Design Contradiction:

Ease of operationVSForce

Solution Approach 1:

The filter device is divided into multiple linear bodies that are braided together, allowing the filter to be segmented into manageable units that can be independently controlled during insertion and deployment, improving both insertability and fixing force

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The filter transitions from a two-dimensional flat structure to a three-dimensional cup shape through controlled turning back, adding spatial dimensionality that enhances both insertion capability and anchoring force against the vessel wall

Inventive Principle:

Principle #17Another dimension (Dimensionality change)

2Adaptability or versatility

If the filter is moved or tilted in the blood vessel, then the filter can adapt to vessel curvature, but the collected thrombus may be scattered

Engineering Contradiction:

Improveadaptability to vessel curvatureVSAvoidthrombus collection stability

Core Design Contradiction:

Adaptability or versatilityVSReliability

Solution Approach 1:

The filter employs flexible linear bodies braided into a mesh structure that can bend and conform to curved vessel walls while maintaining structural integrity, allowing adaptation to vessel geometry without compromising thrombus collection stability

Inventive Principle:

Principle #30Flexible shells and thin films

Solution Approach 2:

The filter uses composite construction with multiple materials of different flexibility and strength properties braided together, creating a structure that is both flexible enough to adapt to curvature and strong enough to prevent thrombus scattering

Inventive Principle:

Principle #40Composite materials

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 filter device enhances the fixing force within the biological lumen, reducing the risk of thrombi scattering and pulmonary embolism by securely anchoring the filter, allowing effective collection and removal of thrombi without tilting or slipping.

Implementation Method 1

an elastically deformable portion interlocked with the shaft portion, the deformable portion having a plurality of wires braided in a mesh shape

Methodology Applied

Scientific EffectElasticity: Elasticity

Data Source

PatentUS11672642B2Filter device

Publication Date: 2023.06.13 TERUMO KK

AI summary

A filter device insertable into a biological lumen includes a shaft portion and an elastically deformable portion interlocked with the shaft portion, the deformable portion having a plurality of wires braided in a mesh shape. The wires include wires of a first type, each having a diameter d. A sum of d3 of all of the wires is 0.08 to 0.25 mm3.