Embolic Protection Basket With Core Wire Expansion
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Solution Overview
Problem
Current embolic protection devices restrict blood flow when deployed and are difficult to retrieve after use, posing challenges during stenosis procedures in the vasculature.
Innovation Solution
An embolic protection device with a self-expanding basket and filter bag mechanism, where a core wire expands and collapses the basket for easy deployment and retrieval, minimizing flow restriction and allowing for efficient capture of emboli.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a traditional embolic protection device is deployed within the vasculature, then emboli can be captured, but blood flow is restricted
Solution Approach 1:
The device is divided into separate functional components: a basket for emboli capture and a filter bag for filtration. This segmentation allows each component to be optimized for its specific function while minimizing interference with blood flow. The basket can be collapsed to minimal profile for delivery and expanded only when needed, reducing flow restriction during deployment.
Solution Approach 2:
The basket is designed to be dynamically collapsible and expandable via a core wire mechanism. During delivery, the basket is collapsed to minimize the cross-sectional profile and reduce flow restriction. Upon deployment, the basket expands to its full configuration to maximize emboli capture capability. This dynamic transformation resolves the contradiction between maintaining small profile and providing effective protection.
2Reliability
If a traditional embolic protection device is deployed within the vasculature, then emboli can be captured, but the device is difficult to retrieve
Solution Approach 1:
The core wire mechanism provides dynamic control over the basket's configuration. To retrieve the device, the core wire is manipulated to collapse the basket back to its minimal profile, reducing the cross-sectional area and making the device easier to withdraw through the vasculature. This dynamic transformation directly addresses the retrieval difficulty.
Solution Approach 2:
The basket is designed to nest within itself when collapsed, with the struts folding into a compact configuration that minimizes the overall profile. This nested structure allows the device to be delivered through a catheter and then collapsed for retrieval, resolving the contradiction between deployment effectiveness and retrieval ease.
3Reliability
If the basket is expanded to capture emboli, then protection is maximized, but the device profile increases
Solution Approach 1:
The basket transitions dynamically between a compact collapsed state for delivery and a fully expanded protective state during use. The core wire mechanism enables this transformation, allowing the device to present a small profile during delivery and then expand to maximize emboli capture capability when positioned in the vasculature.
Solution Approach 2:
The basket struts are segmented and articulated, allowing them to be collapsed into a compact configuration for delivery and then expanded to their full configuration for protection. This segmented design enables the device to minimize its profile during delivery while providing maximum protection when deployed.
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
The device ensures minimal flow restriction during deployment and easy retrieval, effectively capturing emboli while maintaining a small profile for delivery, thereby reducing the risk of inadvertently dislodging material from the lesion site.
Implementation Method 1
Another section of the wires spirals around the core wire to define a hollow channel in which the core wire can reciprocate. Thus, pulling or pushing a proximal end of the core wire relative to the spiraled section expands or contracts the basket.
Data Source
AI summary
An embolic protection device includes a basket defined by a section of a set of wires arranged as a plurality of struts. These struts are coupled together at their distal ends as well as to the distal end of a core wire or mandrel. Another section of the wires spirals around the core wire to define a hollow channel in which the core wire can reciprocate. Thus, pulling or pushing a proximal end of the core wire relative to the struts expands or contracts the basket. A filter bag is attached to the basket for capturing clots when the basket is in an expanded configuration.