Rotary Microfluidic Pump With Cam-Controlled Precision Dosing
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Solution Overview
Problem
Existing medical fluid delivery systems, such as syringe and peristaltic pumps, are prone to inaccuracies and inconsistencies due to environmental variations and are often expensive, lacking cost-effective and reliable mechanisms for precise delivery of small quantities of fluids.
Innovation Solution
A medical pump system utilizing a reservoir cartridge assembly with flexible membranes and a cam-actuated actuator assembly, incorporating a camshaft synchronized with input and output valves, ensures accurate and consistent fluid delivery by controlling port closures and using a motor with capacitor discharge for controlled rotation, along with a pressure sensor for occlusion detection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If syringe pumps are used for accurate fluid delivery, then dosing accuracy is improved, but device cost and complexity increase due to powerful motors and lead screw mechanisms
Solution Approach 1:
The patent replaces the traditional motor-driven lead screw mechanism with a magnetic field-based actuation system. A permanent magnet array interacts with a magnetically responsive element on the plunger to achieve precise positioning without mechanical contact, eliminating the need for complex lead screws and reducing overall device complexity while maintaining dosing accuracy.
Solution Approach 2:
The patent introduces a magnetically responsive element as an intermediary between the magnetic actuator and the plunger. This intermediary transfers magnetic force to the plunger without direct mechanical contact, enabling precise fluid delivery while simplifying the mechanical structure and reducing the number of moving parts.
2Ease of operation
If syringe pumps use motor driven lead screw mechanisms for controlled delivery, then fluid delivery control is improved, but susceptibility to environmental variations increases
Solution Approach 1:
The patent replaces friction-based mechanical lead screw mechanisms with a magnetic field-based actuation system. Magnetic fields are not affected by environmental factors such as temperature changes, humidity, or contamination, providing more reliable and consistent fluid delivery control without susceptibility to environmental variations.
3Device complexity
If peristaltic pumps are used for fluid delivery, then device simplicity is improved, but dosing accuracy and consistency deteriorate due to environmental variations
Solution Approach 1:
The patent replaces the mechanical compression mechanism of peristaltic pumps with a magnetic field-based actuation system. This substitution maintains the simplicity of the device structure while achieving superior dosing accuracy and consistency, as magnetic fields are not affected by environmental variations that compromise peristaltic pump performance.
4Weight of moving object
If ambulatory pumps are scaled down for portability, then device portability is improved, but cost increases due to requirement of small powerful motors
Solution Approach 1:
The patent replaces the need for small powerful motors in ambulatory pumps with a magnetic field-based actuation system. The permanent magnet array provides the necessary actuation force without requiring expensive high-density motors, reducing device cost while maintaining portability and enabling accurate fluid delivery in ambulatory settings.
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 system provides reliable, cost-effective, and accurate delivery of therapeutic fluids like insulin under varying conditions, minimizing environmental impacts and ensuring safe, ambulatory use with durable and disposable components.
Implementation Method 1
be sufficiently resilient to rebound and increase the volume of the displacement chamber when released from the compressed state
Implementation Method 2
a motor with capacitor discharge for controlled rotation
Data Source
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AI summary
Rotary microfluidic medical pump and pumping method embodiments are discussed herein that may be used for controlled delivery of small and precise volumes of therapeutic or non-therapeutic fluids in a variety of environmental conditions. Certain medical pump and pumping method embodiments discussed herein may also be useful for the controlled delivery of certain therapeutic fluids that may be susceptible to degradation when exposed to high levels of pressure, flow velocity, shear stress or the like.