Nested Mechanical Thrombectomy Assembly for Distal Vessel Capture
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Solution Overview
Problem
Current mechanical thrombectomy devices face challenges in navigating and capturing occlusions in distal vessels due to their limited working length, increased friction on fragile blood vessel walls, and risk of unintentional release, which can lead to complications such as bleeding and damage.
Innovation Solution
A nested mechanical thrombectomy assembly comprising an outermost and at least one inner device, each independently actuatable, with a smaller distal section for distal vessels, minimizing friction and providing a tighter grip, and a bifurcated distal section for branch vessels, allowing simultaneous or sequential actuation to capture occlusions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of moving object
If conventional mechanical thrombectomy devices are used to reach distal vessels, then the working length is extended, but the friction force on fragile blood vessel wall increases
Solution Approach 1:
The device employs a nested configuration where an inner mechanical thrombectomy device with smaller outer diameter is positioned within an outer device with larger outer diameter. This nesting allows the system to achieve extended working length for reaching distal vessels while the inner smaller-diameter device minimizes friction force on the fragile blood vessel wall during navigation and retrieval.
2Reliability
If conventional mechanical thrombectomy devices are used in distal vessels, then occlusion capture is attempted, but the risk of unintentional release increases
Solution Approach 1:
The nested configuration provides redundant capture capability where both the inner and outer mechanical thrombectomy devices can independently engage and secure the occlusion. This dual-layer capture system significantly reduces the risk of unintentional release during navigation through tortuous distal vessels, as one device can maintain grip even if the other experiences slip or disengagement.
Solution Approach 2:
The device utilizes independently actuatable mechanisms that allow dynamic adjustment of capture parameters. The inner and outer devices can be deployed and actuated independently, enabling optimization of grip strength and engagement depth according to the specific occlusion characteristics and vessel geometry, thereby improving capture reliability while minimizing release risk.
3Productivity
If conventional mechanical thrombectomy devices are used for distal occlusions, then retrieval is attempted, but complications such as bleeding and damage occur
Solution Approach 1:
The nested configuration enables a staged retrieval approach where the inner device with smaller outer diameter performs the primary capture and initial retrieval through the tortuous distal vessel pathway, minimizing friction and trauma to the vessel wall. The outer device provides support and can serve as a backup capture mechanism, reducing the overall risk of complications such as bleeding and vessel damage while maintaining efficient occlusion removal.
4Adaptability or versatility
If single mechanical thrombectomy device is used, then device complexity is low, but the ability to treat multiple branch vessels is limited
Solution Approach 1:
The nested configuration integrates multiple functional capabilities within a unified device structure. The inner device can be independently actuated to treat occlusions in branch vessels, while the outer device handles the main vessel occlusion. This nested architecture provides multi-vessel treatment capability without requiring completely separate devices, as the inner device is contained within and coordinated with the outer device structure.
Solution Approach 2:
The device is segmented into independently actuatable inner and outer mechanical thrombectomy devices, each capable of independent deployment and operation. This segmentation allows the system to adapt to complex anatomical scenarios involving multiple branch vessels while maintaining a relatively streamlined overall structure, as each segment can be activated only when needed for specific treatment requirements.
Data Source
AI summary
A nested mechanical thrombectomy assembly deliverable as a single assembled unit that includes an outermost mechanical thrombectomy device and at least one inner mechanical thrombectomy device, each mechanical thrombectomy device being actuatable from a radially compressed state to a radially expanded state. While in the radially compressed state, the at least one inner mechanical thrombectomy device is disposed in the inner channel of the outermost mechanical thrombectomy device. Each of the outermost mechanical thrombectomy device and the at least one inner mechanical thrombectomy device is actuatable/deployable independently of one another.