Syringe Pump Non-Decoupling Drive Mechanism
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Solution Overview
Problem
Syringe pumps with half nut mechanisms are prone to wear and tear, leading to limited pushing force, increased radial friction, flow rate fluctuations, reduced accuracy, and potential injection failure, while full nut mechanisms are costly due to the need for additional electronics and interfaces for control.
Innovation Solution
A syringe pump module with a non-decoupling drive mechanism featuring a full nut push plate assembly and motor actuation, allowing bidirectional movement without decoupling from the screw rod, reducing the need for additional electronics and interfaces, and enabling quick, accurate, and smooth operation with various syringe sizes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a half nut transmission push plate is used, then disengagement is allowed for easier repositioning, but pushing force is limited, radial friction increases, wear and tear accelerates, flow rate fluctuations increase, accuracy reduces, and injection failure may occur
Solution Approach 1:
The drive mechanism is segmented into a motor module, transmission module (screw rod and full nut), and push plate module. This segmentation allows the full nut to maintain permanent engagement for reliability while the motor module can be independently controlled for bidirectional movement, achieving both reliability and operational flexibility without requiring half-nut disengagement
Solution Approach 2:
The system transitions from static half-nut engagement to dynamic full-nut engagement with motor-controlled bidirectional movement. The motor actuation mechanism enables the push plate to move forward and reverse along the screw rod, providing dynamic repositioning capability while maintaining continuous engagement for maximum pushing force and reliability
2Reliability
If a full nut transmission push plate is used, then pushing force increases and wear reduces, but permanent engagement is difficult to realize
Solution Approach 1:
The manual repositioning mechanism of traditional full-nut systems is replaced with an electric motor actuation system. The motor provides controlled bidirectional rotation of the screw rod, enabling easy repositioning of the push plate while the full nut maintains its permanent engagement characteristics, thus achieving both high reliability and ease of operation
Solution Approach 2:
The system changes the control parameter from manual mechanical adjustment to electric motor control. By controlling the motor's rotation direction and speed, the push plate can be easily repositioned along the screw rod while the full nut remains permanently engaged, resolving the contradiction between permanent engagement and repositioning ease
3Ease of operation
If additional electronics and interfaces are added for full nut control, then bidirectional movement is achieved, but device complexity and cost increase
Solution Approach 1:
The motor actuation mechanism is integrated directly into the pump housing, merging the drive function with the structural housing. This integration eliminates the need for separate external control interfaces and electronics, achieving bidirectional control while minimizing device complexity and cost
Solution Approach 2:
The motor serves multiple functions: it drives the screw rod for bidirectional push plate movement, provides precise positioning control, and enables both forward injection and reverse repositioning operations. This multi-functionality reduces the need for additional specialized components and interfaces, simplifying the overall system
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 module provides a cost-effective, accurate, and long-lasting solution with smooth motion, capable of using any syringe size and style, eliminating the need for extra interfaces and electronics, thus improving upon both half nut and full nut syringe pumps.
Implementation Method 1
a screw rod and a full nut push plate assembly. The full nut has a complete thread in the radial direction. The screw rod extends through the full nut and couples to the motor
Implementation Method 2
a motor coupled to the non-decoupling drive mechanism
Implementation Method 3
radial friction to increase of the transmission nut leading to fast wear and tear
Data Source
AI summary
Disclosed herein is a syringe pump module with a non-decoupling drive mechanism and motor actuation mechanism to configured to bidirectionally move the non-decoupling drive mechanism.