Nested Filter and Collection Device for Debris Removal

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Solution Overview

Problem

In medical procedures for treating occlusions or stenosis in body lumens, such as blood vessels, existing methods face challenges in effectively trapping and removing debris generated from lesion areas, particularly in lower extremity arteries, where the distal blood vessels are thinner, making it difficult to collect trapped objects using filters introduced from the downstream side.

Innovation Solution

A medical system and method involving a filter indwelled downstream from the stenosed site, a conveying device to position and expand the filter, and a collection device to engage and pull the filter upstream, allowing for effective trapping and removal of debris without disturbing blood flow or damaging tissue, using a trapping portion that can be elastically expanded and contracted, and a collection device with a collection shaft and guiding catheter to accommodate and pull the filter and trapped debris.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If a filter is introduced from the downstream side of the lower extremity artery to trap debris, then the filter can effectively trap debris without passing through the lesion area, but it becomes difficult to collect a large amount of debris trapped by the filter due to the thinner blood vessel at the downstream side

Engineering Contradiction:

Improvedebris trapping effectivenessVSAvoiddebris collection difficulty

Core Design Contradiction:

ReliabilityVSEase of operation

Solution Approach 1:

The filter is nested within the collection device, which is introduced from the upstream side. The collection device encompasses the filter, allowing the filter to trap debris while the collection device provides the structural support and access to the upstream blood vessel for easy retrieval. This nesting arrangement combines the debris trapping capability of the filter with the collection advantage of the upstream introduction approach.

Inventive Principle:

Principle #7Nested doll (Nesting)

Solution Approach 2:

The system is divided into two functional segments: the filter segment for debris trapping and the collection device segment for debris retrieval. The filter segment is positioned downstream to trap debris, while the collection device segment is introduced from upstream to collect the trapped debris. This segmentation allows each component to perform its specific function optimally while overcoming the limitation of thin downstream vessels.

Inventive Principle:

Principle #1Segmentation

2Ease of operation

If a filter is introduced from the upstream side to collect debris, then the thicker blood vessel facilitates easier collection, but the filter may pass through the lesion area and fail to effectively trap debris

Engineering Contradiction:

Improvedebris collection easeVSAvoiddebris trapping effectiveness

Core Design Contradiction:

Ease of operationVSReliability

Solution Approach 1:

Inventive Principle:

Principle #7Nested doll (Nesting)

3Productivity

If a balloon catheter is used to treat a lesion area with large thrombus, then the treatment can be performed, but a large amount of thrombus separates and falls as debris that may block distal blood vessels

Engineering Contradiction:

Improvetreatment capabilityVSAvoiddebris blockage risk

Core Design Contradiction:

ProductivityVSObject-affected harmful factors

Solution Approach 1:

The filter is deployed in advance before the balloon catheter treatment begins. This preliminary placement of the filter downstream of the lesion area ensures that any debris generated during the subsequent balloon catheter treatment is immediately trapped, preventing it from traveling to and blocking distal blood vessels.

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The filter is positioned to counteract the harmful effect of debris generation before the treatment occurs. By having the filter in place beforehand, the system preemptively prevents the harmful consequence (debris blockage) that would otherwise result from the necessary treatment action.

Inventive Principle:

Principle #9Preliminary anti-action

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 system enables efficient trapping and removal of debris from the lesion area without blocking distal blood vessels, ensuring safety and effectiveness by using the thicker upstream blood vessel for collection, and preventing tissue damage through controlled expansion and contraction of the trapping portion.

Implementation Method 1

using a trapping portion that can be elastically expanded and contracted

Methodology Applied

Scientific EffectElastic expansion and contraction: Elasticity

Data Source

PatentUS11974753B2Medical system and method of using the same

Publication Date: 2024.05.07 TERUMO KK

AI summary

A method includes indwelling a filter inside a body lumen in a living body so that the filter is indwelled at a position downstream from a stenosed site in the body lumen, moving a collection device in a downstream direction within the living body from upstream of the stenosed site to the stenosed site while the filter remains indwelled at the position downstream from the stenosed site, engaging the filter with the collection device while the filter is indwelled at the position downstream from the stenosed site so that the filter is connected to the collection device, and removing the collection device and the filter from the living body by moving both the filter and the collection device in an upstream direction while the filter and the collection device are engaged with one another.