IVC Filter Retrieval Flap Inversion Mechanism
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Solution Overview
Problem
Current temporary Inferior Vena Cava (IVC) filter retrieval systems face difficulties in capturing and stabilizing filters, especially when tilted or off-kilter, due to unstable anchoring and blood flow, making recapture challenging.
Innovation Solution
The system incorporates a reversible capture mechanism with a flap that can be reconfigured using a pusher wire or plunger to invert and ever, allowing for secure capture and release of IVC filters, facilitating their retrieval and addressing complications such as tissue ingrowth.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a traditional snare loop is used to capture the IVC filter, then the procedure is simple in principle, but difficulty is encountered when the filter is tilted or off-kilter due to unstable anchoring
Solution Approach 1:
The retrieval device employs an inverted flap configuration where the flap is everted (turned outward) to create a cup-like structure that captures the filter hook. This inversion principle allows the flap to securely engage with the filter from a tilted orientation, solving the reliability issue while maintaining procedural simplicity
Solution Approach 2:
The flap is designed to be dynamically reconfigurable between inverted (capture) and everted (release) states. This dynamic capability allows the device to adapt to different filter orientations during capture while providing a stable anchoring mechanism, and then easily transition to release when needed
2Reliability
If the filter is anchored stably to prevent disorientation, then recapture becomes easier, but the device complexity increases
Solution Approach 1:
The retrieval device is segmented into distinct functional components: a shaft, an expandable flap portion, and a pusher mechanism. This segmentation allows each component to perform its specific function (positioning, capturing, and securing) independently, achieving stable anchoring without excessive overall complexity
Solution Approach 2:
The expandable flap acts as an intermediary element between the retrieval catheter and the IVC filter. It provides the stabilizing anchoring function while remaining part of the retrieval device, thus achieving reliable filter capture without requiring complex external anchoring systems
3Adaptability or versatility
If a reversible capture mechanism is added to allow filter release, then bail-out capability is achieved, but the device complexity increases
Solution Approach 1:
The same inverted flap mechanism used for capture is reversed (everted) to enable release. This dual-use of the inversion principle for both capture and release functions provides bail-out capability without requiring separate mechanisms, thus limiting the increase in device complexity
Solution Approach 2:
The expandable flap serves multiple functions: it can be inverted to capture the filter, held in that position to maintain secure anchoring, and everted to release the filter if needed. This multi-functionality achieves adaptability while avoiding the need for separate capture and release mechanisms
Data Source
Figure 1A~2C
Figure 3A~3B
AI summary
Funnel-trap type devices or systems made of braid are described for capture and retrieval or, instead, capture and subsequent release 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.