Thrombus Filter With Overfill Prevention Umbrella
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Solution Overview
Problem
Existing thrombus filters fail to effectively prevent thrombus escape during retraction after capture, especially in stenosed blood vessels, and do not minimize interference with implantation processes.
Innovation Solution
A thrombus filter design featuring a sheath, thrombus intercepting net, and an overfill prevention umbrella with a constricted memory shape, where the umbrella's opening faces the same direction as the intercepting port, ensuring the umbrella covers the port upon retraction to prevent thrombus escape, utilizing memory alloy materials for ease of operation and filtration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the thrombus intercepting net is retracted after capturing thrombus, then the filter can be removed from the blood vessel, but the thrombus may escape during retraction
Solution Approach 1:
The overfill prevention umbrella is nested within the sheath in a compressed state before deployment. When the sheath is retracted, the umbrella automatically expands to cover the intercepting net, preventing thrombus escape during the retraction process. This nesting mechanism allows the system to maintain both reliability during removal and ease of operation.
Solution Approach 2:
The overfill prevention umbrella is deployed in advance before the sheath is fully retracted. By establishing the protective cover beforehand, the system ensures that any thrombus captured by the intercepting net is secured before the retraction process begins, eliminating the risk of escape during removal.
2Reliability
If the opening portion of the intercepting net faces the distal end, then the filter can capture thrombus effectively, but the structure becomes more complex and operation more difficult
Solution Approach 1:
Instead of having the intercepting net open toward the proximal end (control end) as in conventional filters, this invention inverts the orientation so that the opening faces the distal end. This inversion allows the net to capture thrombus more effectively while the overfill prevention umbrella manages the retraction process, simplifying the overall operation despite the directional change.
3Reliability
If the intercepting net is made to tightly fit the blood vessel wall, then filtration efficiency improves, but the device becomes harder to implant in stenosed vessels
Solution Approach 1:
The overfill prevention umbrella is designed to be dynamically deployable, transitioning from a compressed state during implantation to an expanded state during thrombus containment. This dynamic characteristic allows the device to navigate through stenosed vessels easily while still achieving tight filtration when deployed, resolving the contradiction between implantation ease and filtration efficiency.
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
The filter effectively retrieves thrombi during operations, prevents thrombus escape upon retraction, and minimizes interference with blood vessel implantation processes, offering a simple and convenient operation method with enhanced filtering efficacy.
Implementation Method 1
the open end of the umbrella surface is in a constricted memory shape; when the thrombus intercepting net is retracted, the umbrella surface of the overfill prevention umbrella covers the intercepting port of thrombus intercepting net, and the open end of the umbrella surface is constricted to prevent the thrombus from escaping
Data Source
AI summary
A thrombus filter has a sheath, a thrombus intercepting net having an intercepting port, and an overfill prevention umbrella being a meshed structure that always surrounds the entire thrombus intercepting net. The overfill prevention umbrella has an umbrella stand and an umbrella surface, and is self-biased such that, at body temperature, the umbrella surface is configured to always converge towards the center of the intercepting port. The thrombus filter assumes a first position when the thrombus intercepting net is released from the sheath, where the distal opening of the overfill prevention umbrella is pushed open by the intercepting port. The thrombus filter assumes a second position when the thrombus intercepting net is retrieved into the sheath, where the umbrella surface converges towards the center of the intercepting port, and the open end of the umbrella surface is constricted to prevent the thrombus from escaping.