Vertical Magnetic Stir Bar Mixing for Reaction Chamber Degassing
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Solution Overview
Problem
Existing mixing methods in biotechnology, such as pipette mixing, vortexing, and thermal mixing, are variable and time-consuming, requiring specialized equipment and skilled operators, and fail to efficiently remove air bubbles, leading to inconsistent reactions.
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 mechanism to detect stir bar presence and alert users to issues, and a kit for nucleic acid amplification that includes a thermocycler.
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 are not disrupted and remain trapped at the bottom
Solution Approach 1:
The patent inverts the traditional magnetic mixing approach by moving the magnetic 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 of the stir bar position fundamentally changes the mixing dynamics to eliminate the harmful effect of bubble trapping while maintaining effective mixing.
Solution Approach 2:
The patent introduces vertical movement of the magnetic stir bar in addition to rotation, creating three-dimensional mixing action. The stir bar moves up and down within the reaction chamber while rotating, which disrupts air bubbles and enhances mixing efficiency. This addition of vertical motion represents a dimensional change from traditional two-dimensional bottom-rotation mixing.
2Manufacturing precision
If pipette mixing or vortexing is used for rehydration, then mixing can be achieved, but specialized equipment and trained operators are required
Solution Approach 1:
The magnetic mixing device is designed to be self-regulating with automated control of stir bar speed and vertical movement. The system performs mixing operations autonomously without requiring operator intervention or skill, eliminating the need for trained technicians while maintaining consistent mixing results. The device serves itself by automatically adjusting parameters to achieve optimal mixing.
Solution Approach 2:
The patent replaces manual mechanical mixing methods (pipette mixing, vortexing) with an automated magnetic driving system. The magnetic stir bar is controlled by a magnetic driver that automates the mixing process, substituting complex manual mechanical operations with a simplified automated magnetic actuation system that is easier to operate.
3Reliability
If thermal mixing is used during temperature cycling, then mixing occurs, but reaction time is prolonged by several cycles
Solution Approach 1:
The magnetic mixing device performs thorough mixing of reaction components before the thermal cycling process begins. By pre-mixing the reagents and ensuring complete rehydration and uniform distribution, the system eliminates the need for additional mixing cycles during thermal processing, thereby reducing overall reaction time while maintaining mixing uniformity.
Solution Approach 2:
The magnetic stir bar operates continuously during the mixing phase to ensure complete and uniform mixing of reaction components. This continuous mixing action achieves thorough homogenization in a single dedicated mixing step, preventing the need for intermittent mixing during thermal cycles and reducing total process time.
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
Facilitates rapid, consistent mixing and bubble removal, reducing reaction time and variability, allowing untrained users to operate, and achieving results comparable to or better than conventional methods.
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.