Deformable Basket Filter for Debris Aspiration in Vascular Lumen
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Solution Overview
Problem
Existing medical devices struggle to effectively aspirate and remove debris collected in filters during vascular treatments, especially in large blood vessels, due to the risk of debris scattering or the filter becoming full, requiring complex manipulation and inefficient aspiration methods.
Innovation Solution
A medical device with a deformable filter portion that transitions from a contracted state for insertion to an expanded basket shape for debris collection, and a support portion with larger gaps to hold debris, allowing for effective aspiration via an aspiration catheter guided by a shaft portion, and subsequent contraction for safe removal.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If a wire-woven filter is installed to collect debris during vascular treatment, then debris collection capability is improved, but the filter may become full and require complicated manipulation for removal
Solution Approach 1:
The filter is designed to be dynamically changeable between an expanded state for debris collection and a contracted state for removal. The filter can be contracted by pulling it toward the proximal side, allowing it to be withdrawn from the guiding sheath without complex manipulation while maintaining debris collection capability.
Solution Approach 2:
The filter is divided into multiple strands that can be independently manipulated. This segmentation allows the filter to be contracted by pulling individual strands proxward, enabling easy removal from the guiding sheath without requiring complex manipulation techniques.
2Quantity of substance
If the filter is contracted to remove debris, then debris collection is maintained, but debris may scatter to peripheral portions
Solution Approach 1:
An aspiration catheter is introduced as an intermediary device to actively remove debris from the filter. The catheter extends through the filter structure and applies aspiration force to draw debris into its lumen, preventing scattering during filter contraction and removal while maintaining effective debris collection.
3Ease of operation
If an aspiration catheter is pushed into the filter by the shaft portion, then the catheter can be guided to the edge portion, but the catheter cannot reach the concave portion where debris is collected
Solution Approach 1:
Instead of pushing the aspiration catheter from the proximal side toward the distal end, the catheter is introduced from the distal side through the lumen of the shaft portion. This inverted approach allows the catheter to directly reach the concave portion where debris accumulates, maintaining both ease of operation and aspiration effectiveness.
4Quantity of substance
If the filter portion has small gaps for effective filtration, then debris collection is improved, but the support structure requires larger gaps for structural integrity
Solution Approach 1:
The filter structure employs different gap sizes in different regions: the filter portion has small gaps for effective debris filtration, while the support portion has larger gaps to maintain structural integrity and facilitate catheter passage. This local differentiation of gap sizes allows both filtration effectiveness and structural strength to be optimized simultaneously.
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
Enables efficient aspiration and removal of debris, preventing scattering and facilitating easier manipulation by allowing the aspiration catheter to reach the filter's concave portion and ensuring debris is held within the filter, thus reducing the risk of restenosis.
Implementation Method 1
aspirating the substances collected inside the concave portion by using the aspiration catheter
Data Source
AI summary
A medical device is disclosed for collecting substances inside a body lumen. The medical device includes an elongated shaft portion; a filter portion that has multiple gaps, that is formed in a net shape, that is deformable to be in an expanded state where the filter portion has a basket shape so as to form a concave portion, and that is deformable from the expanded state to be in a contracted state where an opening end portion of the concave portion is contracted; and a support portion that is formed to include a gap larger than gaps of the filter portion and that includes an interlock portion interlocked with the opening end portion of the filter portion and a support side connection portion connected to the shaft portion.