Expandable Basket Retrieval Device for Thrombus Capture
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing methods for removing thrombus and other materials from aorto-venous grafts and blood vessels are limited, leading to premature occlusion and the need for frequent graft replacements due to inflammation and thrombus formation, which complicates the extension of the useful life of these grafts.
Innovation Solution
An expandable and contractible basket device is introduced into the body lumen, comprising a distal and proximal basket with a middle portion, which can be actuated to enclose and capture material, allowing for the retrieval of thrombus and other objects within the body lumen, thereby extending the life of grafts and improving vascular flow.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Duration of action of stationary object
If a basket device is used to retrieve thrombus and other materials from aorto-venous grafts, then the useful life of the grafts is extended, but the device complexity increases
Solution Approach 1:
The basket device is deployed from within a delivery sheath, with the baskets nested inside the sheath during delivery and then expanded outward to engage the graft. This allows the complex basket mechanism to be delivered through a simple catheter-like sheath, resolving the contradiction between device complexity and clinical usability for extending graft life
Solution Approach 2:
The basket device is divided into multiple segments or struts that can be collapsed together for delivery and then separated/expanded at the target site. This segmentation allows the device to transition from a compact, simple delivery state to an expanded, functional retrieval state, enabling thrombus removal to extend graft life without requiring permanently complex device architecture
2Reliability
If the basket device is expanded to capture material, then the retrieval effectiveness is improved, but the device cannot be easily removed or repositioned
Solution Approach 1:
The basket device employs dynamic struts that can transition between expanded and collapsed states. When expanded, the struts provide rigid support for effective thrombus capture; when collapsed, the device becomes flexible and can be easily repositioned or removed. This dynamic transformation resolves the contradiction between retrieval effectiveness and ease of operation
Solution Approach 2:
The basket device utilizes flexible wire or rod structures that can bend and collapse during delivery and repositioning, then rigidize when expanded for thrombus capture. This flexibility allows the device to adapt its mechanical properties based on operational phase, enabling both effective retrieval and easy manipulation
Data Source
AI summary
An apparatus and method for capturing material within a body lumen are disclosed. The apparatus includes a core wire extending from a proximal end to a distal tip, an actuator member defining a lumen for receiving at least a portion of the core wire, and a distal basket having a distal enclosed end fixed relative to the core wire and one or more elements extending from a proximal open end to a collar slidable on the core wire. The collar is slidable on the core wire within an interior of the distal basket such that, when the collar contacts the actuator member, the collar applies an inward force to direct the proximal open end of the distal basket radially inwardly.