Multi-basket clot capturing device with segmented baskets
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Solution Overview
Problem
Current clot retrieval devices are inadequate as they can only capture clots from a single side and rely on internal force, which may not be sufficient to dislodge clots adhering to the vessel wall, and often result in unsafe delivery and increased risk of injury due to the need for precise user manipulation.
Innovation Solution
A multi-basket clot capturing device with a distal and proximal basket connected to a wire and hypotube, allowing for capture from multiple sides by expanding to form a cage around the clot, reducing the need for excessive force and improving safety by capturing from outside the clot.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single-tube device is used to capture clot from inside, then the device structure is simple, but the capturing force is insufficient to dislodge clots adhering to vessel wall
Solution Approach 1:
The single tube device is segmented into multiple baskets (distal basket and proximal basket) that can be deployed independently. Each basket captures clot from a different location, and together they provide sufficient capturing force to dislodge clots adhering to the vessel wall while maintaining manageable device complexity.
Solution Approach 2:
The device transitions from a single-tube internal capture approach to a multi-basket external capture approach. The baskets are deployed radially outward from the delivery catheter to surround and capture the clot from multiple directions, adding spatial dimensionality to the capturing mechanism and significantly increasing the effective capturing force.
2Adaptability or versatility
If fixed baskets are delivered proximally and distally to capture clot, then the capturing coverage is improved, but the delivery safety deteriorates due to risk of puncturing clot and dislodging particles
Solution Approach 1:
The distal basket is deployed and positioned against the clot before the proximal basket is deployed. This preliminary positioning allows the distal basket to stabilize the clot and prepare for capture, while the proximal basket is then deployed in a controlled manner to complete the encirclement, reducing the risk of premature clot disruption and particle dislodgment.
Solution Approach 2:
The baskets are designed with dynamic deployment characteristics, allowing them to expand and conform to the clot shape after deployment. This dynamic adaptation enables the baskets to capture the clot effectively from multiple sides while minimizing initial mechanical stress and reducing the risk of vessel injury during the capture process.
3Measurement precision
If precise user manipulation is required to position clot capturing devices, then the device positioning accuracy can be improved, but the operation safety deteriorates due to increased risk of vessel wall injury
Solution Approach 1:
The multi-basket device incorporates self-positioning and self-adjusting mechanisms that reduce dependence on precise manual manipulation. The baskets automatically adjust their positions and orientations to optimally capture the clot, and the device includes features that prevent over-manipulation and reduce the risk of vessel wall injury during positioning.
4Device complexity
If a single tube device drags clot through vasculature, then the device structure is simple, but the clot capture reliability deteriorates when clot adheres to vessel wall
Solution Approach 1:
The single tube device is segmented into multiple baskets that can be deployed at different locations along the clot. This segmentation allows each basket to independently engage with different portions of the clot, providing multiple attachment points that collectively ensure reliable clot capture even when the clot is firmly adhered to the vessel wall.
Solution Approach 2:
The device transitions from a single-tube internal capture approach to a multi-basket external capture approach. The baskets are deployed radially outward from the delivery catheter to surround and capture the clot from multiple directions, adding spatial dimensionality to the capturing mechanism and significantly increasing the effective capturing force to reliably dislodge clots from the vessel wall.
Data Source
AI summary
A multi-basket clot capturing device that includes a distal basket connected to a wire. The distal basket may be positionable distal of the clot and operable to capture a distal portion of a clot. A proximal basket may be connected to a hypotube that is slidably axially connected to the wire. The proximal basket may be positionable proximal of the clot and operable to capture a proximal portion of the clot. A cage can form between the proximal and distal baskets around multiple portions of the clot for capturing the clot. Sliding the wire distally, or microcatheter proximally, relative to the clot causes the distal basket to move from a collapsed state to an expanded state. The cage may be around at least two portions of the clot that are opposed.