Magnetic Stir Bar Mixing for Reaction Chamber Bubble Removal
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Solution Overview
Problem
Existing mixing methods in biotechnology, such as pipette mixing, vortexing, and thermal mixing, are variable and require specialized equipment or skilled operators, and fail to efficiently remove air bubbles trapped within reaction chambers, leading to inconsistent results.
Innovation Solution
A magnetic mixing device using a magnetic stir bar and a control unit to ensure uniform mixing and bubble removal, with a feedback loop to detect the presence of the stir bar and alert users to potential issues, allowing untrained operators to achieve consistent mixing results.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional magnetic mixers use a stir bar rotating at the bottom of the reaction chamber, then mixing is achieved, but air bubbles remain trapped at the bottom and are not removed
Solution Approach 1:
The patent inverts the traditional magnetic mixing approach by moving the stir bar from the bottom of the reaction chamber to the top, where it can effectively disrupt and remove air bubbles that would otherwise become trapped at the bottom. This inversion allows the mixing mechanism to address the harmful effect of air bubble retention while maintaining effective mixing.
2Object-affected harmful factors
If pipette mixing or vortexing is used to remove air bubbles, then air bubbles are removed, but specialized equipment and trained operators are required
Solution Approach 1:
The magnetic mixing device performs air bubble removal automatically through the motion of the stir bar, eliminating the need for manual intervention with specialized equipment like pipettes or vortex mixers. The system serves itself by incorporating the bubble removal function into the standard mixing operation, making it accessible to untrained personnel.
3Stability of the object's composition
If thermal mixing is used to mix reaction components, then mixing is achieved, but reaction time is prolonged by several cycles
Solution Approach 1:
The patent replaces thermal mixing with a mechanical magnetic stirring system. The magnetic stir bar, driven by a magnetic field, creates vigorous mechanical mixing that achieves homogeneous solution distribution much faster than thermal convection alone, thereby reducing the number of temperature cycling cycles needed and shortening overall reaction time.
4Quantity of substance
If air bubbles are present in the reaction chamber, then reaction volume is reduced, but detecting and addressing this issue requires additional complexity
Solution Approach 1:
The patent converts the harmful presence of air bubbles into a beneficial mixing mechanism. The stir bar's motion specifically targets and disrupts air bubbles, using them as part of the mixing process rather than treating them as separate problems requiring detection and removal systems. This approach maintains effective reaction volume without adding detection complexity.
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 provides fast, consistent mixing and bubble removal, reducing reaction time and variability, and is operable by untrained personnel, enhancing the reliability of chemical and biological reactions.
Implementation Method 1
A magnetic mixing device with a rare earth magnet and a vertically moving stir bar
Data Source
AI summary
A magnetic mixing device designed to mix fluid in a reaction chamber and remove air bubbles if present. The device comprises a holder with embedded magnets, which causes movement of a stir bar within the reaction chamber. The holder may be moved by an electric linear actuator configured to generate linear motion or an electric motor configured to generate a circular motion. When orientated so the stir bar moves vertically within the reaction chamber, the stir bar disrupts any air bubbles trapped within or below the fluid.