Valved Needle Assembly With Spring-Free Valve Reset
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Solution Overview
Problem
Conventional valved needle assemblies face issues with increased parts and assembly complexity due to the use of coil springs, leading to difficulties in assembly and potential adhesive leakage into the fluid path.
Innovation Solution
A valved needle assembly design featuring a connector and pipe body with locking protrusions and inclined guide surfaces facilitates easy assembly by preventing dislodgment and stabilizing the valve body without the need for coil springs, reducing the number of parts and assembly steps.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a coil spring is provided to stably place the valve body in a closed state, then the valve can be reliably closed when the external flow path is removed, but the number of parts increases, assembly steps increase, and the size of the needle assembly increases
Solution Approach 1:
The invention removes the coil spring from the system entirely. Instead of using a spring to maintain the valve in a closed state, the valve body is designed with a slit that allows it to be pushed open by the external flow path connection and automatically close when the connection is removed, without requiring any elastic restoring mechanism.
Solution Approach 2:
The valve body is segmented with a slit that allows it to deform elastically under the pushing force of the external flow path, opening the valve. When the force is removed, the valve body returns to its original closed state through its own structural elasticity, eliminating the need for a separate spring component.
2Ease of operation
If a coil spring is provided to push back the pusher to the initial position, then the pusher can be reset when the external flow path is removed, but the number of assembling steps increases and assembly difficulty increases
Solution Approach 1:
The coil spring is completely removed from the assembly. The pusher is designed to be pushed forward by the external flow path connection and automatically returns to its initial position through the elastic deformation and recovery of the valve body structure, without requiring a separate spring mechanism.
3Strength
If adhesive is used to fix the needle hub and connection hub, then the components can be securely bonded, but adhesive may leak into the fluid flow path and the number of bonding steps increases
Solution Approach 1:
The invention eliminates the need for adhesive bonding between the needle hub and connection hub. Instead, a mechanical locking mechanism using a locking protrusion and locking groove provides secure fixation without any bonding agents, completely preventing adhesive leakage into the fluid path and removing the bonding step entirely.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The design allows for a more secure and efficient assembly process, improving production efficiency by minimizing the number of components and simplifying the assembly procedure while maintaining the functionality of the valve mechanism.
Implementation Method 1
a locking protrusion and a locking part provided to superposed faces of the connector and the pipe body in the assembly part, the locking protrusion and the locking part preventing the insertion part from dislodgment by mutual lock
Implementation Method 2
an inclined guide surface formed on a tip end portion in a direction of assembly of either one of the connector and the pipe body to which the locking part is provided, the inclined guide surface guiding the locking protrusion
Implementation Method 3
when the pusher is pushed back to the proximal end side by elastic recovering action of the valve body
Data Source
Figure 1~3
Figure 4~5
Figure 6
AI summary
A valved needle assembly 10 includes a connector 46 having an inner hole 77, a pipe body 44 fixed to a tip end of the connector 46, a valve body 16, and an assembly part 50 in which an insertion part 46a provided to one of the connector 46 and the pipe body 44 is inserted into another such that the connector 46 is disposed within or about the pipe body 44. A locking protrusion 66 and a locking part 105 are provided to superposed faces 48a, 49a of the connector 46 and the pipe body 44 in the assembly part 50 for preventing the insertion part 46a from dislodgment by mutual lock, and an inclined guide surface 57 for guiding the locking protrusion 66 is formed on a tip end in a direction of assembly of the connector 46 or the pipe body 44 to which the locking part 105 is provided. The valve body 16 is incorporated by being mated with the connector 46 and the pipe body 44.