Thrombectomy Device with Constriction and Membrane for Fragment Retention
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Solution Overview
Problem
Current thrombectomy devices often fail to completely remove thrombi due to detachment of thrombus fragments from the device during blood flow, especially with less solid clots, risking further ischemic events.
Innovation Solution
A thrombectomy device with a distal portion having a constriction and a membrane that captures thrombus fragments outside the device, ensuring they are retracted into the microcatheter, combined with a lattice structure for secure retention and a funnel-shaped membrane for efficient blood flow.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a thrombectomy device is used to capture thrombus, then the thrombus can be removed from the blood vessel, but the thrombus may detach from the device due to constant blood flow
Solution Approach 1:
The device employs a nested structure where an inner capture structure (with hooks or loops) is positioned within an outer filtration structure. The inner structure captures the thrombus while the outer structure acts as a safety net to prevent detachment, creating a multi-layered retention system that addresses both capture efficiency and retention reliability
Solution Approach 2:
The device utilizes a flexible membrane or thin film structure that can conform to the thrombus shape while maintaining retention. This flexible shell allows the device to adapt to varying thrombus sizes and shapes, ensuring reliable capture and prevention of detachment during blood flow
2Reliability
If the device structure is expanded to capture more thrombus fragments, then capture completeness improves, but device complexity increases
Solution Approach 1:
The device is divided into distinct functional segments: a proximal section with a specific structure for initial thrombus engagement, and a distal section with filtration or capture elements. This segmentation allows each part to perform its specific function efficiently while keeping the overall design manageable and not excessively complex
Solution Approach 2:
The device structure is designed to perform multiple functions with a unified design. The same structural elements that provide mechanical support also serve as capture or filtration surfaces, eliminating the need for separate specialized components for each function and thereby reducing overall device complexity while maintaining capture completeness
Data Source
AI summary
A device (1) for removing thrombi from blood vessels, wherein the device (1) has an expanded state in which it is set free temporarily in the blood vessel and a compressed state in which it is introduced into and removed from the blood vessel through a microcatheter, wherein the device (1) has a proximal (2), a middle (3) and a distal portion (4), with the middle portion (3) having a substantially cylindrical structure and the proximal portion (2) being coupled to an insertion aid (5), and the distal portion (4) having a substantially cylindrical basic structure, with a constriction (6) being arranged between the middle (3) and distal portion (4), and the distal portion (4) being at least partially covered by a membrane (7). The inventive device (1) is characterized by the fact that thrombus fragments becoming detached from the thrombus to be captured are safely retained and removed from the blood vessel.