Catheter Assembly Support Mechanism for Puncture Stability
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Solution Overview
Problem
The existing catheter assemblies, such as those described in US 2016/0256667 A, face issues with low support performance during puncture due to the upper and lower portions not being directly held together, leading to separation and difficulty in accurately puncturing the multi-structure needle.
Innovation Solution
A catheter assembly with a first support portion and a second support portion, both separate from the grip, are directly held to each other, providing enhanced support for the catheter and inner needle, ensuring stable puncture performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If two support portions are arranged separately from the grip to support the catheter, then the catheter support capability is improved, but the support performance deteriorates because the upper and lower portions are not directly held together and are easily separated
Solution Approach 1:
The patent connects the upper support portion and lower support portion through a direct holding mechanism (engagement structure), merging them into a unified support system. This prevents separation during puncture while maintaining the dual support configuration, thereby resolving the contradiction between having separate support portions and maintaining reliable support performance.
Solution Approach 2:
The patent introduces an engagement structure as an intermediary element between the upper and lower support portions. This mediator component directly connects the two support portions, preventing their separation while allowing them to function as distinct support elements, thus resolving the contradiction between separability and support reliability.
2Ease of operation
If the multi-structure needle is deflected during puncture, then the ease of operation is reduced, but the puncture precision deteriorates making it difficult to puncture accurately
Solution Approach 1:
The patent applies preliminary anti-action by providing support portions that preemptively counteract the deflection forces acting on the multi-structure needle during puncture. The support structure is positioned to resist oblique forces before they can cause significant deflection, maintaining puncture precision while allowing natural hand manipulation.
Solution Approach 2:
The patent modifies the mechanical parameters of the needle assembly by adding support portions that change the stiffness and stability characteristics. This allows the needle to maintain its intended trajectory during puncture while still being maneuverable, resolving the contradiction between ease of operation and puncture precision.
3Device complexity
If the upper and lower support portions are not directly held together, then the device complexity is reduced, but the support performance deteriorates due to easy separation
Solution Approach 1:
The patent segments the support structure into distinct upper and lower support portions that are separately manufacturable and positionable, yet connected through a direct holding mechanism. This segmentation allows for simpler individual components while maintaining reliable overall support performance through the engagement structure.
Solution Approach 2:
The patent merges the upper and lower support portions into a functionally integrated support system through a direct holding mechanism. This combination maintains the simplicity of separate components while ensuring they work together reliably, preventing separation and maintaining support performance.
Data Source
AI summary
A catheter assembly includes: a catheter; a catheter hub fixed to the catheter; an inner needle inserted through the catheter; a grip fixed to and holding the inner needle; a first support portion, which is a member separate from the grip and is configured to support an outer side of the catheter; and a second support portion, which is a member separate from the grip, has at least a part that is located at a position facing the first support portion, and is configured to support the outer side of the catheter. The first support portion and the second support portion are releasably engaged with each other.