Continuous Helical Impeller for Variable Diameter Bioreactor Mixing
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Solution Overview
Problem
Traditional bioreactor impeller systems face limitations in achieving consistent volumetric addition and optimal mixing in variable diameter bioreactors, leading to growth lag, increased footprint, and higher contamination risks due to detached mixing zones and limited scalability.
Innovation Solution
A novel impeller design with a continuous agitator running along the entire vertical length of the reactor, featuring helical blades with optimized pitch and size, which reduces mixing time and minimizes foaming, allowing for consistent agitation across varying reactor volumes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If traditional multiple blade impellers are used in variable diameter bioreactors, then agitation can be provided to the culture, but detached mixing zones are created leading to inconsistent mixing and growth lag
Solution Approach 1:
The impeller is divided into multiple individual blades (typically 3-7 blades) spaced around a central shaft, with each blade contributing to the overall mixing action. This segmentation allows the impeller to create comprehensive fluid circulation patterns that eliminate detached mixing zones while maintaining stable and consistent mixing throughout the bioreactor volume.
Solution Approach 2:
The impeller blades are positioned at specific radial distances from the shaft and at different vertical heights, creating a three-dimensional mixing structure. This spatial arrangement ensures that mixing action is distributed throughout the entire reactor volume, eliminating dead zones and ensuring consistent composition throughout the culture.
2Productivity
If traditional impeller designs are used, then mixing can be achieved, but mixing time is excessive and contamination risks increase
Solution Approach 1:
The impeller is designed to create continuous and uniform mixing action throughout the culture volume, eliminating periods of poor mixing or stagnant zones. The multiple blades rotate continuously to maintain constant fluid circulation, significantly reducing the time required to achieve homogeneous mixing while maintaining consistent mixing quality throughout the process.
3Adaptability or versatility
If traditional impeller configurations are used in variable diameter bioreactors, then agitation is provided, but scalability is limited and footprint increases
Solution Approach 1:
The impeller design with multiple blades on a central shaft is universally applicable to bioreactors of varying diameters and volumes. By adjusting the number of blades, their radial positions, and their vertical spacing, the same basic impeller configuration can be optimized for different scale bioreactors, from small research vessels to large production reactors, without requiring fundamentally different designs.
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 novel impeller design significantly improves mixing efficiency, reduces blend times, and eliminates growth lag by maintaining optimal mixing conditions across changing reactor volumes, enhancing scalability and reducing contamination risks.
Implementation Method 1
Each of the leading and trailing edges defines a helix or spiral between the axial ends of the impeller blade
Implementation Method 2
The novel impeller design significantly improves mixing efficiency, reduces blend times
Data Source
AI summary
An impeller is usable in a variable diameter bioreactor having multiple vessel sections of successively increasing or decreasing volume. The impeller includes an impeller blade extending along an impeller blade axis between first and second axial ends and having opposed impeller blade faces, an impeller blade leading edge, and an impeller blade trailing edge. Each of the leading and trailing edges defines a helix or spiral between the axial ends of the impeller blade. In certain arrangements, the impeller blade is one of at least two impeller blades joined together along an impeller shaft extending axially along the impeller blade axis mentioned, and the helix or spiral has a pitch approximately equal to one half of a length between the first and second axial ends.