Closable Braid Retriever for Large Clot Encapsulation
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Solution Overview
Problem
Existing mechanical thrombectomy devices face challenges in effectively trapping and retracting large clots while minimizing clot fragmentation, which can lead to the release of harmful particles into the bloodstream.
Innovation Solution
A system featuring an elongated braid structure with a closable distal end, capable of transitioning between collapsed and expanded states, which includes a closure wire to maintain the distal opening and minimize clot fragmentation during retrieval.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If traditional suction devices are used to aspirate clot material, then small clots can be effectively retrieved, but large clots fragment and release harmful particles into the bloodstream
Solution Approach 1:
The device divides the clot retrieval process into distinct phases: engagement, encapsulation, and extraction. The braid structure segments the clot containment function from the retrieval function, allowing the clot to be captured intact and pulled through the braid structure without fragmentation.
Solution Approach 2:
The braid structure acts as a flexible shell that encapsulates the clot material. This flexible enclosure maintains clot integrity during retrieval while allowing the device to navigate tortuous vasculature. The braid structure's flexibility enables it to conform to the clot shape and prevent fragmentation.
2Reliability
If the closure wire is positioned to pull inward the distal portion of the elongated structure, then the distal opening can be closed to trap clots, but the elongated structure may not bend properly along its length
Solution Approach 1:
The braid structure has different local properties: the distal portion is designed to be more compliant to allow bending and closure, while the proximal portion maintains structural integrity for force transmission. This local differentiation allows the device to close the distal opening reliably while still navigating tortuous vessels.
Solution Approach 2:
The braid structure transitions from a static configuration to a dynamic one during operation. When the closure wire is actuated, the distal portion dynamically changes shape to close the opening. The structure adapts its rigidity based on the actuation state, allowing both bending for navigation and closure for trapping.
Data Source
AI summary
A system for retrieving material or objects from a biological vessel is provided. the system includes an elongated braid structure configured for transitioning between collapsed and expanded states, the elongated braid structure surrounding a lumen having a distal opening when in the expanded state. The system further includes a closure wire positioned along a length of the elongated braid structure, the closure wire being actuatable to pull inward a distal portion of the elongated braid structure and thereby at least partially close the distal opening.