Magnetic Drive Bioreactor Impeller Stability

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Solution Overview

Problem

Bioreactors face issues with wobbling impellers due to complex and fragile equipment, leading to compromised operations and high costs, making them less accessible for educational and industrial use.

Innovation Solution

A modular bioreactor system featuring a cylindrical hollow tube with a magnetic stir bar, axle, and radial spacers that engage the tube's inner diameter, allowing for smooth and stable rotation, along with a temperature control and aeration system, and data logging capabilities, enhancing durability and educational accessibility.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If traditional bioreactor impellers are used, then mixing function is achieved, but wobbling occurs during rotation compromising operation

Engineering Contradiction:

Improveimpeller rotation stabilityVSAvoidmixing effectiveness

Core Design Contradiction:

ReliabilityVSEase of operation

Solution Approach 1:

The patent replaces the traditional mechanical bearing system with a magnetic drive system. A magnetic drive impeller is rotated by a magnetic field generated by a rotating magnetic field generator, eliminating mechanical contact and bearing wear. This substitution resolves the wobble issue caused by mechanical bearing failures while maintaining effective mixing functionality.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

Solution Approach 2:

The patent introduces a magnetic field as an intermediary between the drive mechanism and the impeller. The rotating magnetic field generator creates a magnetic field that acts on the magnetic drive impeller to rotate it, eliminating direct mechanical contact. This intermediary approach resolves the stability问题 by removing the mechanical connection point that causes wobbling.

Inventive Principle:

Principle #24Intermediary (Mediator)

2Reliability

If complex and fragile equipment is used, then mixing function is achieved, but cost increases and accessibility decreases

Engineering Contradiction:

Improvemixing functionVSAvoidsystem cost

Core Design Contradiction:

ReliabilityVSEase of manufacture

Solution Approach 1:

The patent replaces complex mechanical bearing systems with a simpler magnetic drive system. The magnetic field generator and magnetic drive impeller eliminate the need for precision mechanical bearings, reducing manufacturing complexity and cost while maintaining reliable mixing function.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

Solution Approach 2:

The patent divides the bioreactor system into modular components including a separate magnetic field generator, magnetic drive impeller, and bioreactor vessel. This segmentation allows each component to be manufactured independently using simpler, more cost-effective processes while maintaining overall system reliability.

Inventive Principle:

Principle #1Segmentation

3Speed

If traditional mechanical bearings are used, then impeller rotation is achieved, but wobbling stops rotation and compromises contents

Engineering Contradiction:

Improveimpeller rotation speedVSAvoidrotation continuity

Core Design Contradiction:

SpeedVSReliability

Solution Approach 1:

The patent substitutes mechanical bearings with magnetic coupling to transmit rotational force. The rotating magnetic field generator creates a magnetic field that continuously drives the magnetic drive impeller without mechanical contact, eliminating the wobble that causes rotation stops and ensuring continuous operation.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

Solution Approach 2:

The magnetic drive system provides continuous rotational force to the impeller without the interruptions caused by mechanical bearing wear and wobble. The magnetic field continuously acts on the magnetic drive impeller, maintaining steady rotation and ensuring continuous mixing action on the bioreactor contents.

Inventive Principle:

Principle #20Continuity of useful action

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 a durable, cost-effective, and modular bioreactor solution that ensures smooth and stable impeller rotation, enabling efficient mixing and temperature control, while being adaptable for various vessel sizes and educational applications.

Implementation Method 1

The axle is stationary and the cylindrical tube rotates about its longitudinal axis and the longitudinal axis of the axle in response to a rotational magnetic force received by the magnetic stir bar

Methodology Applied

Scientific EffectRotational magnetic force: Magnetic Field

Data Source

PatentUS10900007B2Bioreactor system

Publication Date: 2021.01.26 GEORGIA STATE UNIVERSITY RESEARCH FOUNDATION INC

AI summary

According to various implementations, the bioreactor system includes a bioreactor vessel, an impeller for stirring contents within the vessel, a temperature control source for controlling the temperature of the contents of the vessel, an aeration system for supplying air to the vessel, and one or more data loggers. According to certain implementations, the impeller is a novel impeller design that spins more smoothly and rapidly than known impellers. In addition, the bioreactor system is modular, durable, and relatively inexpensive compared to existing bioreactor systems, which allows for bench-scale implementation, use with differently sized bioreactor vessels, and accessibility to more educational programs, according to some implementations.