Catheter Assembly Needle Support Arms
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Solution Overview
Problem
Existing catheter assemblies for blood vessel puncture during transfusions require complex operations to support and release the inner needle, leading to potential deflection and instability during puncture.
Innovation Solution
A catheter assembly with a needle support portion featuring pair of rotatable support arms and a restraining portion that automatically releases the support arms, allowing for simple operation and preventing inner needle deflection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the two arms are provided to support the inner needle through the catheter, then the deflection of the inner needle can be inhibited, but the operation becomes complicated requiring the user to strengthen and weaken pinching force
Solution Approach 1:
The catheter hub automatically performs the function of supporting and releasing the inner needle through its forward movement. As the catheter hub moves forward, it automatically releases the restraint on the two arms, causing them to open without requiring user intervention. This self-service mechanism eliminates the need for users to manually adjust pinching force while maintaining reliable inner needle support during puncture.
Solution Approach 2:
The two arms are pre-configured in a closed state that automatically supports the inner needle before puncture. The restraint mechanism is pre-set on the catheter hub, so when the catheter hub is advanced, the arms are automatically released at the appropriate moment. This preliminary configuration ensures the inner needle is supported when needed without requiring complex user operations during the procedure.
2Ease of operation
If the two arms open in the upper and lower direction to allow catheter hub movement, then the catheter can be advanced, but the inner needle easily deflects and requires holding the base portion instead of leading end
Solution Approach 1:
The two arms are designed to dynamically change their state from closed to open based on the operational phase. During puncture, the arms remain closed to support the inner needle and prevent deflection. After puncture, when the catheter hub moves forward, the arms automatically open to allow smooth advancement. This dynamic behavior ensures both inner needle stability and catheter mobility at appropriate times without requiring manual intervention.
Data Source
AI summary
A catheter assembly is disclosed, which includes a catheter; a catheter hub fixed to a base end portion of the catheter; an inner needle having a needlepoint, inserted into the catheter; a needle hub coupled to the inner needle; a needle support portion configured to support the inner needle through the catheter on a leading end side beyond the catheter hub, the needle support portion having a pair of support arms openable and closeable in a different direction to an axis of the inner needle; a restraining portion capable of restraining the pair of support arms in a closed state and releasing a restraint of the pair of support arms; and wherein the restraining portion is movable with respect to the pair of support arms by a movement of the catheter hub relative to the inner needle, which releases the restraint with respect to the pair of support arms.