Segmented Mesh Capture Device for Thrombectomy
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Solution Overview
Problem
Conventional thrombectomy devices suffer from low treatment efficiency and success due to deformation, thrombus escape, and vessel damage during thrombus removal, particularly in tortuous vessels.
Innovation Solution
A medical device with a supporting member and a mesh capture device comprising sequentially arranged capture units, including a first capture unit with an outwardly folded and curved mesh, and multiple second capture units with radially projecting meshes, designed for enhanced compliance and thrombus capture, reducing deformation and vessel damage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If conventional mesh capture devices are used to remove thrombus, then thrombus removal is attempted, but the device deforms when compressed by thrombus due to lack of radial strength, leading to low treatment success
Solution Approach 1:
The capture device is divided into multiple capture units with different structural characteristics. The first capture unit has an outwardly folded mesh structure providing high radial strength for engaging hard thrombus, while the second capture unit has a radially projecting mesh structure providing compliance for tortuous vessels. This segmentation allows the device to simultaneously address both radial strength and compliance requirements.
Solution Approach 2:
Different portions of the capture device are given different structural properties to perform different functions. The first capture unit is designed with high radial strength characteristics for thrombus engagement, while the second capture unit is designed with high compliance characteristics for vessel adaptation. This local differentiation resolves the contradiction between needing strength for thrombus removal and compliance for vessel safety.
2Strength
If high stiffness is used to provide sufficient radial strength, then radial strength is improved, but the device lacks compliance and may get stuck when retracted into a catheter due to limited luminal space
Solution Approach 1:
The device segments the capture units into two types with different stiffness characteristics. The first capture unit maintains higher stiffness for radial strength, while the second capture unit uses a radially projecting mesh structure that provides compliance. This allows the device to exhibit both high radial strength and high compliance properties simultaneously in different locations.
Solution Approach 2:
The capture units are designed to be dynamically adaptable during deployment and retraction. The outwardly folded and radially projecting mesh structures can deform and adjust their configuration based on the mechanical environment, providing compliance during retraction while maintaining radial strength during thrombus engagement.
3Area of stationary object
If distally-closed mesh cylinders are used to increase contact area with blood vessel, then capture area is improved, but the risk of blood vessel damage is increased
Solution Approach 1:
The capture device uses flexible mesh structures with outwardly folded and radially projecting configurations that can conform to the vessel wall geometry. This flexibility allows the device to increase contact area for capturing adherent thrombus while adapting to vessel contours, thereby reducing the risk of damage compared to rigid closed-cylinder designs.
4Adaptability or versatility
If conventional devices are used in tortuous blood vessels, then vessel access is attempted, but the devices collapse due to inadequate compliance, leading to increased risk of thrombus escape
Solution Approach 1:
The second capture unit is specifically designed with radially projecting mesh structure that provides high compliance for navigating tortuous vessels. This local compliance enhancement ensures the device can adapt to vessel curvature without collapsing, while the first capture unit maintains radial strength for reliable thrombus capture.
Data Source
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AI summary
The present invention provides a medical device and a medical system. The medical system includes a medical device, delivery device and an aspiration device. The medical device includes a supporting member and a mesh capture device. The mesh capture device is mounted over an outer circumference of the supporting member at a distal end thereof, and a plurality of capture units of the mesh capture device are sequentially arranged at an interval along an axial direction of the supporting member. In the plurality of capture units, a first capture unit is farther away from a proximal end of the supporting member than second capture units. The first capture unit has a first capture mesh outwardly folded along its entire circumference and curved proximally, and the second capture unit has a second capture mesh radially projecting outwardly along part of its circumference. The second capture meshes of adjacent second capture units form a capture mesh that is along the entire circumference of the supporting member. With this arrangement, both good compliance and desirable supporting performance can be obtained, and effective removal of old and strongly adherent occlusive objects from lumens can be achieved without escape of such occlusive objects.