Assistive Component Radial Expansion for Vena Cava Filter Stability
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Solution Overview
Problem
Existing vena cava filters are prone to tilting and shifting after implantation in the inferior vena cava, leading to ineffective thrombus interception and difficulties in retrieval.
Innovation Solution
A medical device featuring a delivery mechanism with an assistive component that radially expands to maintain the implant in a predetermined form and position within the target lumen, ensuring effective thrombus interception and facilitating retrieval.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If existing filters are implanted into the inferior vena cava, then thrombus interception function is provided, but the filters are prone to tilt and shift, reducing interception effectiveness
Solution Approach 1:
The assistive component is pre-configured with a support structure that maintains the filter in a predetermined central position during implantation. This preliminary positioning action prevents tilting and shifting before the filter is fully deployed, ensuring stable thrombus interception effectiveness from the moment of implantation.
Solution Approach 2:
The assistive component acts as an intermediary between the delivery mechanism and the filter. It provides radial support to the filter during deployment, maintaining its central position in the inferior vena cava and preventing tilt, thereby ensuring stable interception effectiveness without requiring direct manipulation during the procedure.
2Ease of repair
If existing filters are implanted into the inferior vena cava, then thrombus interception function is provided, but retrieval becomes difficult due to shifting
Solution Approach 1:
The assistive component maintains the filter in a predetermined central position and stable configuration during implantation. This preliminary stable positioning ensures that when retrieval is needed, the filter remains in a known, accessible location without having shifted, making retrieval significantly easier and safer.
Solution Approach 2:
The assistive component serves as a mediator that maintains the filter's position stability throughout the implantation and potential retrieval process. By preventing shifts and tilts, it ensures the filter remains in a predictable location, facilitating easier retrieval when clinically indicated.
3Reliability
If the implant is released without radial support, then deployment is simpler, but the implant cannot maintain predetermined form, reducing thrombus interception efficiency
Solution Approach 1:
The delivery system is segmented into the delivery mechanism and the assistive component, which can be independently controlled. The assistive component provides radial support only during the critical deployment phase to maintain the filter's predetermined form, then can be detached or retracted. This segmentation adds functionality without permanently increasing overall system complexity.
Solution Approach 2:
The assistive component provides preliminary radial support during the deployment phase to ensure the filter maintains its predetermined form for optimal thrombus interception. Once deployment is complete, the assistive component's support function is no longer needed, and it can be removed or retracted, leaving a relatively simple permanent implant structure.
Data Source
AI summary
The present invention provides a medical device including a delivery mechanism and an implant, wherein the delivery mechanism includes a delivery component and an assistive component that is connected to the delivery component and configured to be expanded or shrunk in a radial direction of the delivery component, and the implant is detachably connected to the delivery component; the delivery mechanism is configured to deliver the implant to a predetermined position in a target lumen and release the implant, and the assistive component is radially expanded during the release of the implant so as to release the implant with a predetermined form in the predetermined position. The advantage of the medical device is that the implant is positioned with a predetermined form in the target lumen, improving the efficiency for thrombus interception and facilitating subsequent retrieval.