Syringe Pump Clutch Mechanism for Precise Injection Control
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Solution Overview
Problem
Traditional syringe pumps face challenges with complex mechanical structures that require manual operation, leading to laborious use, inaccurate control, and potential for insufficient or excessive injection, as well as limited speed and efficiency, which can be detrimental in emergency situations.
Innovation Solution
A syringe pump design incorporating a propulsion mechanism with a clutch driving assembly and pressure sensing system, allowing for both manual and automatic control, enabling precise positioning and operation through a control system that integrates clutch and propulsion motors with sensors for real-time feedback.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a traditional mechanical structure with rocker mechanism is used, then the syringe pump can be operated manually, but the structure becomes more complicated and operation becomes laborious
Solution Approach 1:
The patent extracts the rocker mechanism from the system and replaces it with a clutch mechanism. The clutch allows the half nut to be disengaged from the screw rod, enabling manual positioning of the propulsion mechanism without requiring continuous manual pressing of a rocker mechanism. This removes the problematic component while preserving manual operability.
Solution Approach 2:
The patent replaces the traditional rocker mechanism with an electric clutch-controlled mechanical system. The clutch driving motor controls the engagement and disengagement of the half nut with the screw rod through electromagnetic actuation, substituting the manual rocker pressing operation with an electrically controlled mechanism that reduces structural complexity and operational labor.
2Ease of operation
If manual control of propulsion mechanism is used, then operation is simple, but stopping position control is inaccurate leading to insufficient or over injection
Solution Approach 1:
The patent incorporates a pressure sensing assembly that detects when the pushing block contacts the piston rod and provides feedback signals to the control system. This feedback mechanism allows the system to automatically determine the correct stopping position, ensuring accurate injection volumes while maintaining simple manual operation through the clutch mechanism.
Solution Approach 2:
The patent introduces a pressure sensing assembly as an intermediary between the manual operation and the injection process. The sensor acts as a mediator that detects the contact between the pushing block and piston rod, translating this mechanical interaction into electrical signals that control the motor stopping position, thereby ensuring precise injection control without complex manual positioning requirements.
3Productivity
If electrically controlled propulsion mechanism is used, then speed and efficiency are improved, but waiting time for propulsion mechanism to retreat affects emergency response
Solution Approach 1:
The patent makes the mechanical connection between the propulsion mechanism and syringe dynamic through the clutch mechanism. The half nut can be engaged or disengaged from the screw rod based on operational needs. During syringe replacement, the clutch disengages the half nut, allowing the propulsion mechanism to remain stationary while the syringe is quickly changed, eliminating the waiting time for mechanism retreat while maintaining high injection speeds during actual operation.
4Force
If manual pressing of rocker mechanism is required, then mechanical propulsion is achieved, but stable control of angle position is difficult causing scraping and abnormal wear
Solution Approach 1:
The patent replaces the manual rocker mechanism with an electric clutch-controlled system. The clutch driving motor provides controlled rotational motion to engage and disengage the half nut with the screw rod, eliminating the need for manual rocker pressing. This substitution ensures stable angular positioning control, preventing the scraping and abnormal wear that occurred with manual operation while maintaining the necessary propulsion force through the screw-nut mechanism.
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 syringe pump achieves accurate and efficient liquid injection by integrating manual and automatic control modes, preventing under- or over-injection and reducing wear on mechanical components, thus enhancing user experience and safety.
Implementation Method 1
The pressure sensing assembly is disposed on the pushing block, to abut against a piston rod of the syringe to detect pressure of the piston rod
Implementation Method 2
The clutch driving motor is in driving connection with the clutch screw rod to drive the clutch screw rod to rotate along an axial direction of the clutch screw rod
Implementation Method 3
The propulsion driving motor is fixed on the bracket and in driving connection with the screw rod to drive the screw rod to rotate
Implementation Method 4
the screw rod drives a nut engaged with the screw rod to linearly motion along an axial direction of the screw rod
Data Source
AI summary
A syringe pump is provided. The syringe pump includes a pump body, a control system, a transmission mechanism, and a propulsion mechanism. The transmission mechanism includes a bracket, a propulsion driving motor, a screw rod, a sliding seat, a half nut, and a clutch driving assembly. The propulsion driving motor configured to drive the screw rod to rotate, the clutch driving assembly is disposed on the sliding seat, and configured to drive the half nut and the screw rod to be engaged and disengaged from each other. The propulsion mechanism includes a connecting rod, a pushing block, a pressure sensing assembly, and a clutch switch. The pressure sensing assembly is disposed on the pushing block and configured to detect pressure of a piston rod of a syringe. The clutch switch is disposed on the pushing block and electrically connected to the clutch driving assembly.