Retrievable Medical Basket With Detachable Legs
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Solution Overview
Problem
Existing medical retrieval devices face difficulties in extracting and releasing entrapped tissue or foreign matter, particularly when the diameter of the retrieval assembly exceeds the narrowed body lumen, leading to potential trauma and the need for successive instrumentation.
Innovation Solution
A medical device comprising a sheath and an elongate member with a retractable retrieval assembly having selectively disconnectable legs, allowing for the entrapment and release of objects within the body lumen, enabling safe removal without causing further trauma.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the retrieval assembly is expanded to capture the object, then the capture capability is improved, but the device cannot be removed through the narrowed lumen
Solution Approach 1:
The retrieval assembly is divided into multiple detachable legs that can be separated from the body of the device. This segmentation allows the main device to be withdrawn through the narrowed lumen while the legs remain to capture and retrieve the object, resolving the contradiction between needing expansion for capture and contraction for removal.
Solution Approach 2:
The legs are extracted as separate functional elements from the main device body. The legs perform the capture function while the main device performs the withdrawal function, allowing each component to optimize its function independently without the constraints of the other.
2Reliability
If successive instrumentation is used to extract fragments, then the extraction capability is improved, but the patient trauma increases
Solution Approach 1:
The single device combines multiple functions: it can fragment stones using lithotripsy, capture fragments with the expandable legs, and retrieve them through the narrowed lumen. This multi-functionality eliminates the need for successive instrumentation, reducing patient trauma while maintaining comprehensive extraction capability.
Solution Approach 2:
The device merges lithotripsy functionality, capture capability, and retrieval functionality into a single integrated system. By combining these previously separate functions into one device, the patent eliminates the need for multiple sequential procedures, thereby reducing cumulative patient trauma.
3Reliability
If the retrieval assembly diameter exceeds the narrowed lumen, then the object capture is improved, but the device removal is prevented
Solution Approach 1:
The retrieval assembly is segmented into detachable legs that can be separated from the main device body. This allows the main device to be withdrawn through the narrowed lumen while the legs remain in place to capture and retrieve the object, resolving the size constraint imposed by the constricted tract.
Solution Approach 2:
The device transitions from a static structure to a dynamic system where the legs can be detached and reattached. This dynamic capability allows the device to adapt its configuration - expanded for capture, then reconfigured for removal - enabling it to overcome the size limitations of the narrowed lumen.
Data Source
AI summary
A device and related methods of use are provided for the capture and removal of various unwanted objects present within the body's anatomical lumens. In an embodiment of the present disclosure, the device includes a sheath, an elongate member, and a retrieval assembly connected to the elongate member and retractable within and extendable from a lumen of the sheath. The device includes one or more legs releasably connected to a portion of the retrieval assembly in response to movement of the elongate member relative to the sheath.