Expandable Retrieval Basket With Selective Wire Release
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Solution Overview
Problem
Existing medical extraction devices face challenges in releasing objects captured by an expandable retrieval basket due to their size, which can lead to procedural issues and increased risk of patient injury during medical procedures.
Innovation Solution
A medical device with a retrieval device comprising a plurality of wires that can move between a closed and open state, allowing for the capture and release of objects, featuring a retention member and a tether to maintain connection during extraction, and a shaft that moves relative to a sheath to release the wires from the retention member.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If an expandable retrieval basket is used to capture objects, then the retrieval capability is improved, but the device complexity increases
Solution Approach 1:
The retrieval basket is nested within the delivery sheath in a compressed state during delivery, then expanded at the target site. This allows the complex expandable structure to be delivered through a simple catheter-like sheath, resolving the contradiction between retrieval capability and device complexity
Solution Approach 2:
The retrieval basket transitions from a static compressed state within the sheath to a dynamic expanded state at the target site. This dynamic transformation allows the device to adapt its structure for effective retrieval while maintaining a simple delivery profile, addressing both retrieval capability and device complexity
2Adaptability or versatility
If the retrieval basket is expanded to capture large objects, then the retrieval capability is improved, but the difficulty of releasing the object increases
Solution Approach 1:
The retrieval basket is divided into multiple wire segments that can be independently manipulated. This segmentation allows the operator to selectively release individual wires or groups of wires to free the object, making the release process easier while maintaining effective capture capability
Solution Approach 2:
The device is designed to allow controlled discarding of the retrieval basket structure after object capture. The basket can be collapsed and detached from the object, with the understanding that the retrieval device itself is discarded or requires complex reconfiguration, simplifying the release mechanism
3Adaptability or versatility
If multiple instruments are used to extract objects, then the retrieval capability is improved, but the risk of patient injury increases
Solution Approach 1:
Multiple functional elements (delivery sheath, expandable basket, wire manipulation mechanisms) are merged into a single integrated device. This allows all retrieval operations to be performed through one instrument rather than multiple separate instruments, reducing procedural complexity and patient injury risk while maintaining comprehensive retrieval capability
Solution Approach 2:
The single device performs multiple functions: delivery through the sheath, expansion for capture, manipulation of captured objects, and release. This multi-functionality eliminates the need for multiple separate instruments, reducing the risk of patient injury associated with multiple instrument insertions and manipulations
Data Source
AI summary
Medical devices, systems, and related methods for capturing objects within a subject (e.g., patient) are described. The medical device includes a sheath, a shaft, and a retrieval device coupled to the shaft. At least a portion of the shaft is movably disposed within the sheath. The retrieval device includes a plurality of wires coupled to a distal end of the shaft, and a retention member coupled to distal ends of the plurality of wires. Movement of the shaft relative to the sheath is configured to release at least one wire of the plurality of wires from the retention member.