Basket Foreign Matter Capture Instrument With Dual Wire Depth Control
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Solution Overview
Problem
Existing body-cavity foreign object capturing devices, such as those with a wire placed in the center of a basket, face difficulties in capturing relatively large foreign objects and multiple stones aligned in a tubular organ, as the wire obstructs the capture process and stones may get stuck or not be fully removed.
Innovation Solution
A body-cavity foreign object capturing device is designed with a second operation wire that expands radially and moves distally relative to the first operation wire, allowing the basket to expand and reduce depth, and incorporating a resin membrane to ensure capture and retrieval of large objects, with the second operation wire tangling with the object between framework wire members.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a wire is placed in the center of the basket to maintain structure, then the basket has structural stability, but the wire serves as an obstacle that prevents large foreign objects from being captured
Solution Approach 1:
The patent removes the central wire from the basket structure. Instead of having a wire running through the center, the basket is formed by multiple independent framework wire members that are coupled at their distal ends. This extraction of the central wire eliminates the obstacle that prevented large foreign objects from being captured, while the framework wire members themselves provide the necessary structural support.
2Object-affected harmful factors
If the basket diameter is expanded to capture large foreign objects, then capture capability is improved, but the basket becomes complex to operate and may not effectively capture multiple stacked stones
Solution Approach 1:
The patent employs a dynamic basket structure where the framework wire members can change the basket's diameter and depth configuration. By moving the first operation wire relative to the second operation wire, the basket diameter can be expanded to capture large foreign objects. The system allows dynamic adjustment between different operational states (contracted for passage, expanded for capture) without requiring complex manual reconfiguration.
3Adaptability or versatility
If the basket depth is reduced to allow passage between stacked stones, then adaptability is improved, but the capture volume is reduced
Solution Approach 1:
The patent implements a dynamically adjustable basket depth through the relative movement of the first and second operation wires. When needing to pass between stacked stones, the basket depth is reduced by moving the wires relative to each other, allowing the compressed basket to navigate tight spaces. Once positioned, the wires can be moved to expand the basket depth and diameter simultaneously, providing sufficient capture volume for multiple stones without compromising either adaptability or capture capacity.
Data Source
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AI summary
Provided is a body cavity foreign matter capture instrument, whereby it is possible to easily capture even comparatively large foreign matter, and to smoothly discharge the captured foreign matter. This body cavity foreign matter capture instrument (10) comprises: a first manipulation wire (15); a plurality of framework wire materials (20), the base end parts whereof are coupled to a leading end part of the first manipulation wire (15), and the leading end parts being respectively bundled together; and a second manipulation wire (25) which is coupled to the leading end parts of the plurality of framework wire materials (20), separates from the first manipulation wire (15) extending toward the base end side of the first manipulation wire (15), and which may be manipulated in isolation from the first manipulation wire (15). By moving the first manipulation wire (15) toward the leading end side relative to the second manipulation wire (25), the framework wire materials (20) expand and configure a basket (30), and by further relatively moving the first manipulation wire (15) toward the leading end side, the basket (30) becomes shallower.