Piston Operation Detection in Medical Liquid Infusion Apparatus
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Solution Overview
Problem
Existing liquid infusion devices lack precise control over small amounts of liquid injection and do not have a reliable method to detect the proper functioning of the piston responsible for liquid discharge.
Innovation Solution
A liquid infusion device is designed with a reusable module and a disposable module, featuring a piston that performs a reciprocating motion driven by magnetic force, and sensors that detect the contact and non-contact states with an SUS pipe to ensure the piston is functioning correctly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a piston is used to discharge liquid in a liquid infusion device, then liquid delivery control is achieved, but the reliability of piston operation cannot be verified
Solution Approach 1:
The patent introduces a detection member as an intermediary component that contacts the piston to convert its mechanical motion into an detectable signal. This mediator enables reliable piston operation verification without requiring complex direct sensing systems, resolving the contradiction between reliability improvement and device complexity.
Solution Approach 2:
The patent replaces complex mechanical sensing systems with a simpler electrical detection mechanism. The detection member forms an electrical circuit with the piston, substituting complex mechanical detection systems with a straightforward electrical continuity check, thereby improving reliability while minimizing added complexity.
2Manufacturing precision
If precise control of small liquid amounts is implemented, then injection accuracy is improved, but control difficulty increases
Solution Approach 1:
The patent employs periodic reciprocating motion of the piston to achieve precise liquid delivery. The piston moves back and forth in regular cycles, with each cycle delivering a controlled amount of liquid. This periodic action simplifies control compared to continuous precision control, as it uses discrete, repeatable motions to achieve accurate small liquid amounts.
Solution Approach 2:
The detection member serves dual purposes: it both detects piston operation and contributes to the liquid delivery mechanism. By using the same component for both detection and fluid control, the patent reduces overall device complexity while maintaining precise liquid injection capability.
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 device achieves precise control over small liquid amounts and enhances operational reliability by ensuring the piston operates correctly, thereby improving the accuracy and consistency of liquid delivery.
Implementation Method 1
a piston that discharges the liquid stored inside while performing a reciprocating motion driven by the magnetic force of the solenoid
Implementation Method 2
When the first and second sensors and the SUS pipe are in contact, the first and second sensors are electrically connected via the SUS pipe. When the first and second sensors and the SUS pipe are not in contact, the first and second sensors are electrically disconnected
Data Source
AI summary
The present invention includes a piston that performs a reciprocating motion, driven by the magnetic force of the solenoid, to discharge the liquid stored inside. The present invention comprising: an SUS pipe that is coupled to one side of the piston and moves reciprocally along with the piston; and first and second detection sensors (s1, s2) positioned adjacent to one end of the SUS pipe, which alternate between contact and non-contact states with the end of the SUS pipe due to its reciprocating motion. The device detects the contact and non-contact states between the first and second sensors and the SUS pipe to determine whether the piston is functioning properly.