IVC Filter Retrieval with Steerable Funnel-Trap
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Solution Overview
Problem
Current temporary IVC filters are difficult to retrieve due to instability and orientation issues within the IVC, compounded by blood flow and clots, making recapture challenging with existing snare-based retrieval methods.
Innovation Solution
A retrieval system featuring a funnel-trap structure with a flexible, steerable design, utilizing a braided material with a distal extension and selectable angular bias, which can capture and securely lock IVC filters regardless of orientation, using a catheter or sheath for retrieval.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a hook-like feature is used on the filter for capture, then the filter can be retrieved using a snare loop, but the retrieval becomes difficult when the filter is tilted or off-kilter due to instability in blood flow and clots
Solution Approach 1:
The filter is designed with a dynamic stabilization mechanism that allows it to self-correct and maintain a stable orientation within the IVC despite blood flow and clot movement. The filter can adapt its position to remain capture-ready without requiring perfect initial placement
Solution Approach 2:
The filter incorporates a pre-positioning feature that ensures the hook-like capture element is always oriented in a predictable position relative to the filter body, regardless of how the filter settles in the IVC. This preliminary orientation preparation makes subsequent snare capture reliable even when the filter is tilted
2Ease of operation
If the filter is designed to avoid orientation issues, then retrieval should be easier, but the problem persists because the device is not anchored into the IVC in a stable fashion
Solution Approach 1:
The filter employs a composite structure combining rigid anchoring elements with flexible stabilizing components. The anchoring features provide stable attachment to the IVC wall while the flexible portions allow the filter to maintain its capture orientation despite movement from blood flow and clots
Solution Approach 2:
The filter includes an intermediary stabilization mechanism that acts between the filter body and the IVC environment, providing stable anchoring while isolating the capture hook from the destabilizing effects of blood flow and clot movement
3Reliability
If constant blood flow and clots are present in the IVC, then the filter remains in place, but these factors disorient the filter making recapture difficult
Solution Approach 1:
The filter incorporates dynamic orientation maintenance features that allow it to adapt to movement caused by blood flow and clots while maintaining a stable capture orientation. The filter can actively counteract disorienting forces to keep the hook in a retrievable position
Data Source
Figure 1A~2E
Figure 3A~3F
Figure 4A~6
AI summary
Funnel-trap type devices are described that are made of shape-set (e.g., heatset) braid for delivery and/or retrieval of Inferior Vena Cava (IVC) filters or other medical devices. Delivery and/or retrieval devices, kits in which they are included, methods of use and methods of manufacture are all contemplated. Additional forming tooling, methods and device embodiment shapes are described herein.