Embolic Protection Device with Self-Expanding Basket and Cannula Filter
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Solution Overview
Problem
Current embolic protection devices face challenges in deploying filters with a small enough profile to avoid dislodging emboli during deployment and ensuring the filter is securely held against the vessel wall to prevent embolic material from passing through, while also allowing for effective capture of emboli and minimization of blood flow occlusion.
Innovation Solution
A medical device featuring a core wire and a self-expanding basket with a filter portion formed from a cannula, where the struts are biased to expand against the vessel wall, allowing blood cells to pass through while capturing emboli, and can be contracted for removal, utilizing materials like Nitinol for shape memory properties to facilitate deployment and retrieval.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If the filter profile is made smaller to avoid dislodging emboli during deployment, then the risk of embolic material breach is reduced, but the filter may not be securely held against the vessel wall to prevent embolic material from passing through
Solution Approach 1:
The filter device is divided into multiple struts that can be independently biased to expand against the vessel wall. Each strut acts as an independent unit that provides radial force to secure the filter portion against the vessel wall, allowing the overall profile to remain small while maintaining secure attachment through distributed contact points.
Solution Approach 2:
The struts are designed to be dynamically responsive, utilizing elastic biasing forces that automatically adjust to the vessel wall geometry. The struts expand radially in response to deployment forces and maintain contact with the vessel wall through elastic recovery, ensuring secure filtration without requiring a large static profile.
2Ease of operation
If the filter portion is not held against the inside of the vessel wall, then deployment is easier, but there is a risk that embolic material may pass between the filter and the vessel wall
Solution Approach 1:
The filter device utilizes its own elastic struts to automatically secure itself against the vessel wall upon deployment. The biased struts expand radially without requiring external forces or complex locking mechanisms, enabling easy deployment while simultaneously achieving secure attachment to prevent embolic material passage.
Solution Approach 2:
The device transitions from a compressed low-profile state during insertion to an expanded state during deployment. The struts change their radial dimension through elastic deformation, allowing the filter to adapt to the vessel wall geometry and maintain secure contact while preserving ease of insertion through the stenosed area.
3Reliability
If a balloon is used to occlude blood flow to prevent emboli, then embolic protection is achieved, but the vessel may be occluded only for short periods of time, limiting use of the procedure
Solution Approach 1:
The embolic protection function is extracted from the temporary balloon occlusion method and implemented through a filter device that remains in place during the procedure. The filter captures emboli continuously as they are generated during angioplasty, eliminating the need for prolonged balloon inflation and extending the effective treatment duration.
Solution Approach 2:
The filter device serves as an intermediary between the angioplasty balloon and the distal vasculature. Instead of relying on temporary balloon occlusion to prevent emboli, the filter acts as a continuous capture mechanism that intercepts embolic material and prevents it from reaching downstream vessels throughout the procedure.
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 effectively captures emboli during procedures by ensuring the filter is securely pressed against the vessel wall, minimizing the risk of embolic material breach and allowing for controlled expansion and contraction to manage blood flow, thereby reducing the risk of ischemic events.
Implementation Method 1
The struts are biased into an expanded state such that the filter portion is forced against an inner wall of the vessel
Implementation Method 2
The filter portion extends from the struts and is formed unitarily therewith. The filter portion extends between a middle portion of the basket and the second end of the basket and includes openings in the cannula configured to allow the passage of blood cells therethrough
Data Source
Figure 1~2
Figure 3
Figure 4A~4B
AI summary
An embolic protection device including a core wire (24) and a basket (12) is disclosed. The basket includes struts (16) and a filter portion (14) formed from a cannula (15) . The struts extend from a first end (18) of the basket to the second end (20) of the basket. The filter portion extends from the struts and is formed unitarily therewith. The filter portion extends between a middle portion (22) of the basket and the second end of the basket and includes openings (17) in the cannula configured to allow the passage of blood cells therethrough .