Thrombectomy Device Open Frame Cell Ring Clot Engagement
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Solution Overview
Problem
Existing stent retriever devices for mechanical thrombectomy suffer from suboptimal clot engagement, retention, and vessel interaction due to their unitary stent body design, which can roll over and fail to capture hard clots, and may apply excessive radial force to the vessel.
Innovation Solution
A mechanical thrombectomy device featuring a support wire with independently mounted clot arrestors, each with frame cell rings of varying radial strength and open/closed configurations, allowing for effective clot engagement and retention while minimizing vessel contact.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a unitary stent body is used to provide radial strength for clot engagement, then clot capture capability is improved, but the device may roll over and bounce off hard clots, reducing engagement effectiveness
Solution Approach 1:
The stent body is divided into multiple segments or modules that can independently engage the clot. Instead of a single unitary structure, the stent comprises multiple radial elements that can flex and adapt to engage hard clots without rolling over, improving both radial strength and engagement reliability
Solution Approach 2:
The stent design incorporates dynamic elements that allow the radial strength to adapt during deployment. The stent can transition from a compressed state to an expanded state with varying radial profiles, enabling it to engage clots of different hardness and maintain contact without bouncing off
2Strength
If the stent fully apposes the vessel to achieve sufficient radial strength for clot engagement, then clot capture is improved, but the risk of vessel injury increases
Solution Approach 1:
The stent applies radial strength locally at specific engagement zones rather than uniformly across the entire vessel circumference. This allows sufficient radial force to engage the clot while leaving other portions of the vessel wall unapposed, reducing overall vessel injury risk
Solution Approach 2:
The stent applies partial apposition to the vessel wall, providing just enough radial strength to engage the clot without full circumferential contact. This partial action achieves the necessary clot capture while minimizing excessive force that could injure the vessel
3Device complexity
If a unitary stent body is used to simplify device structure, then device complexity is reduced, but clot capture and engagement capability deteriorates
Solution Approach 1:
The stent is segmented into multiple functional elements that can independently interact with the clot. This segmentation provides multiple engagement points and mechanisms, improving clot capture capability while maintaining a relatively simple overall device structure through modular design
Solution Approach 2:
The stent employs a nested structure where smaller functional elements are contained within or between larger structural components. This nesting approach allows complex clot engagement functionality to be achieved within a compact and relatively simple device architecture
Data Source
AI summary
A mechanical thrombectomy device includes several clot arrestors mounted on a support wire. The clot arrestors have rings of expandable frame cells. The frame cell rings include an open frame cell ring, having a gap between adjacent frame cells in the ring, and a closed frame cell ring, having no gap between adjacent frame cells. The gap allows clots to enter the clot arrestor for retrieval from a target anatomy. Other embodiments are also described and claimed.