Indwelling Device Single Shaft Radial Control
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Solution Overview
Problem
Conventional indwelling devices for cylindrical treatment tools have a dual shaft structure that increases the diameter of the sheath, making them more invasive for patients, and there is a need to reduce this invasiveness.
Innovation Solution
An indwelling device with a single shaft member that independently controls the radial movement of a cylindrical treatment tool's opening end, allowing for a smaller sheath diameter by using a tubular sheath and an elongated shaft with a first and second controlling part that engage with the treatment tool's engaging parts, enabling separate release of these engagements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a dual shaft structure is used to control radial movement of the cylindrical treatment tool, then the ability to independently control opening and closing is improved, but the sheath diameter increases
Solution Approach 1:
The patent combines two separate shafts into a single integrated shaft that houses both the first and second controlling parts. This merging allows the single shaft to perform the functions of two separate shafts, thereby reducing the sheath diameter while maintaining the ability to independently control the radial movement of the cylindrical treatment tool at different positions.
Solution Approach 2:
The single shaft is segmented into multiple functional parts (first controlling part and second controlling part) that can independently engage with different engaging parts of the cylindrical treatment tool. This segmentation within a unified structure enables independent control of radial movement at different positions without requiring separate shafts.
2Volume of moving object
If a single shaft member is used to reduce sheath diameter, then invasiveness is reduced, but the complexity of controlling independent radial movement increases
Solution Approach 1:
The single shaft member incorporates dynamic elements such as movable engaging parts that can selectively engage or disengage with different positions on the cylindrical treatment tool. This dynamic capability allows the shaft to perform multiple control functions through a single structure, reducing sheath diameter while managing control complexity through flexible engagement mechanisms.
Data Source
AI summary
An indwelling device 1 is provided with: a sheath 20 that is capable of housing a stent graft 10; and a long shaft 30 that is configured to be capable of advancing or retreating inside the sheath along the axial direction. The shaft has a fixing tool 34 and a hollow tube 35 that are respectively engaged with a connection part 14 and a blood vessel wall fixing part 15 of the stent graft to restrict movement of an opening end 11a of the stent graft in the radial direction. The indwelling device is configured to be capable of releasing engagement between the connection part and the fixing tool and engagement between the blood vessel wall fixing part and the hollow tube independently of each other by displacing the shaft with respect to the stent graft in the axial direction.