Dual Net Vascular Filtration Device Eversion Mechanism

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Solution Overview

Problem

Existing vascular filtration devices face challenges in confining embolic debris effectively due to complex geometries and potential tissue ingrowth, leading to delivery and deployment obstacles and unwanted tissue contact.

Innovation Solution

A dual net vascular filtration device with a central frame, proximal, and distal filter nets, where the central frame has a hinged portion to minimize contact points with the host vessel and allows the distal filter net to evert into the proximal filter net upon deployment, reducing tissue ingrowth and facilitating easier deployment and retrieval.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If prior art dual net vascular filtration devices are used to confine embolic debris, then filtration effectiveness is improved, but device geometry becomes highly complicated leading to delivery and deployment obstacles

Engineering Contradiction:

Improvefiltration effectivenessVSAvoiddevice geometry

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The device is divided into two separate filter nets (proximal and distal) that can be independently deployed and function. Each net is attached to different ends of the central frame, allowing them to be delivered and positioned separately within the vessel, simplifying the overall delivery mechanism while maintaining effective debris confinement.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The distal filter net is configured to evert into the proximal filter net upon deployment, creating a nested configuration where one net is inverted inside the other. This nesting approach allows both nets to occupy the same spatial envelope during delivery, reducing the device's overall complexity and facilitating easier delivery through catheters.

Inventive Principle:

Principle #7Nested doll (Nesting)

2Stability of the object's composition

If prior art vascular filtration devices have geometries that facilitate tissue ingrowth, then device stability is improved, but unwanted tissue contact increases leading to complications

Engineering Contradiction:

Improvedevice stabilityVSAvoidtissue ingrowth

Core Design Contradiction:

Stability of the object's compositionVSObject-affected harmful factors

Solution Approach 1:

The central frame is designed with minimum contact points with the host vessel, creating localized contact zones rather than continuous contact. This local quality approach provides sufficient mechanical stability at specific anchor points while minimizing the overall surface area available for tissue ingrowth, thus reducing unwanted tissue contact and associated complications.

Inventive Principle:

Principle #3Local quality

3Reliability

If complex geometries are used to confine embolic debris, then filtration performance is improved, but delivery and deployment obstacles increase

Engineering Contradiction:

Improvefiltration performanceVSAvoiddelivery and deployment

Core Design Contradiction:

ReliabilityVSEase of operation

Solution Approach 1:

The device incorporates a hinged portion in the central frame that allows dynamic movement and adjustment during deployment. This hinge mechanism enables the filter nets to transition from a compressed delivery state to an expanded functional state, facilitating easier deployment while maintaining the complex geometry needed for effective embolic debris confinement.

Inventive Principle:

Principle #15Dynamics

Data Source

PatentEP2882372B1Dual net vascular filtration devices

Publication Date: 2021.11.17 WL GORE & ASSOC INC

Figure 1A~1F
Figure 2A~2C
Figure 3A~3B

AI summary

According to one aspect of the disclosure, a dual net vascular filtration device (100) comprises a central frame (110), a proximal filter net (120) attached to a proximal end (117) of the central frame, and a distal filter net (122) attached to a distal end (116) of the central frame. Upon deployment, the distal filter net can be configured to evert into the proximal filter net.