Everted Basket Thrombus Capture Device

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Solution Overview

Problem

Existing medical devices for capturing thrombi from a patient's vasculature often require multiple stages and tools, which can be harmful and inefficient, as they may dislodge and block other vessels during the process of breaking up clots.

Innovation Solution

A single-tool medical device comprising a catheter and an elongate basket with a closed first end and an open second end, actuated by a wire or cable, allowing for a single-stage capture and removal of thrombi by moving between configurations to draw objects into the basket, utilizing shape memory materials for deployment and constraining mechanisms to ensure effective capture.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If multiple tools and stages are used to capture thrombi, then the capture capability is improved, but the device complexity and procedure time increase

Engineering Contradiction:

Improvethrombus capture capabilityVSAvoidnumber of tools and stages

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The patent combines multiple functions (thrombus disruption, filtration, and aspiration) into a single integrated device. The catheter includes both a disruption element at the distal end and a filter element within the body, allowing simultaneous thrombus breakdown and capture without requiring separate tools or stages.

Inventive Principle:

Principle #5Merging (Combining)

Solution Approach 2:

The catheter is designed as a multi-functional device that can disrupt thrombi, filter debris, and aspirate materials through a single instrument. The disruption element breaks up clots while the filter element captures both large and small particles, eliminating the need for multiple specialized tools.

Inventive Principle:

Principle #6Universality (Multi-functionality)

2Reliability

If thrombus is broken into pieces, then the capture efficiency is improved, but the risk of dislodged parts blocking other vessels increases

Engineering Contradiction:

Improvethrombus capture efficiencyVSAvoidrisk of vessel blockage from dislodged parts

Core Design Contradiction:

ReliabilityVSObject-affected harmful factors

Solution Approach 1:

The filter element acts as an intermediary between the disruption element and the bloodstream. It captures dislodged thrombus particles immediately after disruption, preventing them from traveling through the circulatory system while allowing the disruption process to proceed effectively.

Inventive Principle:

Principle #24Intermediary (Mediator)

Solution Approach 2:

The disruption of thrombus into smaller pieces, which could potentially cause harm by blocking other vessels, is converted into a benefit by the filter element that captures these smaller particles. The same action that increases capture efficiency also increases the number of captureable particles, which the filter then safely retains.

Inventive Principle:

Principle #22Blessing in disguise (Convert harm into benefit)

3Reliability

If a filter is positioned distal to the thrombus, then the capture of dislodged parts is improved, but the device complexity and procedure time increase

Engineering Contradiction:

Improvecapture of dislodged partsVSAvoidprocedure time

Core Design Contradiction:

ReliabilityVSLoss of time

Solution Approach 1:

The filter element is integrated within the catheter body rather than being a separate component positioned distally. This merging of functions allows the filter to capture dislodged parts during the same procedural stage as thrombus disruption, eliminating the need for separate positioning and operation stages.

Inventive Principle:

Principle #5Merging (Combining)

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

Facilitates quick and safe removal of thrombi by creating a suction effect to pull the clot into the basket, minimizing the risk of further blockages and allowing for complete thrombus retrieval in a single procedure.

Implementation Method 1

the basket is made from a shape memory material and is deployed automatically on release from the delivery system

Methodology Applied

Scientific EffectShape memory: Shape Memory Alloy

Implementation Method 2

said movement in use causing objects in a body vessel to be drawn into the basket

Methodology Applied

Scientific EffectSuction: Suction

Data Source

PatentUS9427244B2Object capture device

Publication Date: 2016.08.30 COOK MEDICAL TECHNOLOGIES LLC

AI summary

A medical device for collecting objects from a body lumen comprises a catheter, a basket having a closed first end and an open second end, and an actuator connected to the closed first end of the basket, the catheter and basket moveable relative to one another between a first configuration and a second configuration to draw objects from a body lumen into the basket. In the first configuration the closed first end of the basket is inside the catheter and the open second end is everted over at least a part of the closed first end. The apparatus may be actuated to pull the closed first end of the basket further into the catheter and invert the second end of the basket, the second end scraping the sides of the lumen as it inverts, surrounding an object in the lumen, and drawing the object into the basket.