Embolic Protection Filter Bag with Core Wire Deployment
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Solution Overview
Problem
Current embolic protection devices often 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 featuring a basket defined by wires with a core wire mechanism that allows the filter bag to expand for capturing emboli and collapse for easy retrieval, minimizing cross-sectional profile for delivery and deployment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If embolic protection devices are deployed within the vasculature to capture emboli, then embolic protection is improved, but blood flow restriction increases
Solution Approach 1:
The filter bag is constructed with a porous structure that allows blood to pass through while capturing emboli. The porous material enables selective filtration based on size, permitting normal blood flow while trapping larger embolic particles that could cause downstream complications.
Solution Approach 2:
The filter bag employs a flexible thin-film structure that can conform to the vessel wall while maintaining embolic capture capability. This flexibility allows the device to adapt to vessel geometry without creating significant flow resistance, unlike rigid structures.
2Reliability
If embolic protection devices are deployed to capture emboli, then embolic protection is improved, but device retrieval difficulty increases
Solution Approach 1:
The device incorporates dynamic elements including a collapsible filter bag and adjustable basket structure that can transition between expanded and collapsed states. The core wire mechanism allows the operator to dynamically change the device configuration from an expanded filtering state to a collapsed retrieval state, facilitating easy removal after embolic capture.
Solution Approach 2:
The device is divided into separable components including the filter bag, basket, and core wire assembly. This segmentation allows the filter bag to be disengaged from the basket during retrieval, enabling the operator to remove the emboli-laden filter bag while leaving the basket framework in place or vice versa, simplifying the overall retrieval process.
3Reliability
If the filter bag is engaged with the basket to expand for capturing emboli, then embolic capture capability is improved, but device complexity increases
Solution Approach 1:
The filter bag and basket are combined into an integrated assembly where the filter bag is attached to the distal end of the core wire that passes through the basket. This merging of components creates a unified structure that expands and contracts together, simplifying the deployment and retrieval mechanisms while maintaining effective embolic capture capability.
Data Source
AI summary
A method for embolic protection during treatment of a stenotic lesion in a body vessel is provided. The method comprises disposing an embolic protection device in an undeployed state in the body vessel. The device comprises a basket with a set of struts extending from a distal end to a proximal end of the basket, the struts being arranged to define an opening at the distal end, the basket having an expanded state and a collapsed state. A core wire with a distal end and a proximal end is able to reciprocate through the opening at the distal end of the basket. A filter bag is attached only at the distal end of the core wire, the filter bag being located distally to the distal end of the basket when in the collapsed state. The method further comprises moving the core wire relative to the basket to expand the basket and the filter bag in a deployed state downstream from the stenotic lesion to capture emboli during treatment of the stenotic lesion.