Nested Basket Medical Device for Calculus Fragment Retention
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Solution Overview
Problem
Existing medical devices used for collecting calculus fragments in lumens of the body face challenges in securely retrieving fragments due to large gaps between wires in the basket, leading to fragments dropping out and requiring cumbersome operations, and are not suitable for different tissue structures.
Innovation Solution
A medical device with a handle and elongated sheath featuring a treatment portion comprising two baskets: a first basket with parallel leg portions and a second basket with staggered leg portions, allowing for expansion and contraction modes to securely capture fragments by switching between using one or both baskets based on the location and size of the fragments.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a single basket with large gaps between wires is used, then the device structure is simple and easy to operate, but calculus fragments tend to drop out through the gaps
Solution Approach 1:
The device divides the single basket into two separate baskets (first basket and second basket) that can be independently expanded and contracted. Each basket has its own leg portions, and they work together to provide both secure fragment retention and operational flexibility. The first basket's leg portions and the second basket's leg portions are arranged to create overlapping coverage that prevents fragment dropout.
2Reliability
If a net shape basket is used to restrict dropping out of calculus fragments, then fragment retention is improved, but the basket shape is not suitable for removing calculi in renal calix
Solution Approach 1:
The device employs dynamic expandability where the two baskets can be independently expanded or contracted based on the specific anatomical location and fragment size. The leg portions of both baskets are configured to radially expand when needed for fragment capture and can be independently controlled to adapt to different tissue structures such as ureter or renal calix. This dynamic configuration allows the same device to effectively treat different anatomical locations.
3Reliability
If two baskets with staggered leg portions are used, then gaps are reduced to prevent fragment dropout, but the device structure becomes more complex
Solution Approach 1:
The second basket is nested within or alongside the first basket structure, with both baskets sharing a common control mechanism through the sheath system. The leg portions of the two baskets are arranged in a staggered configuration where they interlock spatially, creating a denser barrier against fragment dropout while maintaining a relatively compact overall structure that can be controlled through a single operational system.
Data Source
AI summary
The medical device disclosed here is configured to remove a plurality of objects at a time from an interior of a living body by restricting the objects from dropping out from an interior of a basket and is capable of treating objects in a body tissues having different structures efficiently with the same device. A treatment portion of a medical device includes an outer basket and an inner basket. A plurality of outer leg portions of the outer basket and a plurality of inner leg portions of the inner basket are arranged so as to be staggered in a circumferential direction. The medical device may be used by being switched between a mode of using only the outer basket and a mode of using both of the outer basket and the inner basket.