Double-Mesh Thrombectomy Stent for Adjustable Lumen Retrieval
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Solution Overview
Problem
Conventional thrombectomy devices struggle with low efficiency in removing both fresh and old thrombi, particularly in tortuous lumens, and risk damaging blood vessels due to inadequate adaptability and potential distal escape of thrombus fragments.
Innovation Solution
A thrombectomy device with a double-layer stent design, comprising an outer mesh stent and an inner mesh stent, controlled by a movement control member, allowing adjustable diameter expansion and contraction to accommodate varying lumen diameters, enhancing capture and removal efficiency while minimizing vessel damage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If disc-shaped capture elements are used to remove thrombus, then fresh thrombus can be effectively removed, but old thrombus adhering firmly to vessel walls cannot be effectively removed
Solution Approach 1:
The capture component is divided into multiple disc-shaped capture units arranged in sequence, with each unit having cutouts formed by laser cutting or otherwise. These segmented structures provide both radial support for removing old thrombus and trapping capability for fresh thrombus, resolving the contradiction between removing different types of thrombus.
Solution Approach 2:
The capture units have different structural characteristics at different locations - the cutouts provide radial support where needed, while the mesh structure provides trapping capability. This local differentiation allows the device to effectively handle both old adherent thrombus and fresh soft thrombus simultaneously.
2Ease of operation
If disc-shaped capture units are retracted into a catheter with small lumen, then the device can be withdrawn, but the capture units may get stuck and piled up impeding smooth retraction
Solution Approach 1:
The capture units are designed to be dynamically compressible during retraction. The flexible structure allows them to compress and expand as needed, enabling smooth passage through the catheter lumen while maintaining their functional structure during deployment and retrieval operations.
Solution Approach 2:
The capture units utilize flexible materials that allow them to deform during retraction into the catheter. This flexibility prevents them from getting stuck or piled up, ensuring reliable retrieval while maintaining structural integrity for effective thrombus capture during the procedure.
3Productivity
If disc-shaped units self-expand to large outer diameter in tortuous lumens, then they can capture thrombus, but they cause damage to the blood vessel
Solution Approach 1:
The diameter of the capture component is made dynamically adjustable rather than fixed. The device can expand to capture thrombus effectively, then be compressed to a smaller diameter for safe withdrawal through tortuous lumens, preventing vessel damage while maintaining capture capability when needed.
Solution Approach 2:
The physical parameters of the capture component, particularly its diameter, are changed during the procedure. The device transitions between expanded and compressed states, allowing it to adapt to varying lumen diameters and prevent harmful forces on the vessel wall during both deployment and retrieval phases.
4Strength
If conventional systems provide great radial support to remove old thrombi, then radial support is sufficient, but thrombus fragments can escape through the capture elements
Solution Approach 1:
The capture component is segmented into multiple disc-shaped units with cutouts, creating a multi-layered trapping structure. This segmentation provides both the radial support needed to remove old thrombus and the multiple barriers necessary to prevent fragment escape, resolving the contradiction between strength and trapping reliability.
Solution Approach 2:
Different regions of the capture component have different structural properties - some areas provide radial support while others provide trapping. The cutouts and mesh structures are strategically positioned to deliver radial force where needed while maintaining trapping capability, ensuring both old thrombus removal and fragment containment.
Data Source
Figure 1a~2a
Figure 2b~2c
Figure 2d~2e
AI summary
The present invention provides a thrombectomy apparatus and device. The thrombectomy device includes a thrombectomy component and a control component. The thrombectomy component includes a thrombectomy stent including an outer mesh stent and an inner mesh stent nested within the outer mesh stent. The control component includes a movement control member and a mounting member. The movement control member is passed through the mounting member and extends out of a distal end thereof and then is coupled to a distal end of the thrombectomy stent, and the outer mesh stent is proximally attached to the mounting member. A proximal end of the inner mesh stent is attached to the mounting member or to the movement control member. The movement control member is able to control and change a diameter of the thrombectomy stent during movement of the movement control member toward a proximal or distal end of the thrombectomy device, adapting the thrombectomy device to various lumens. This can reduce possible damage to a lumen while allowing for effective removal of occlusive material.