Chromatography Mixer with Variable-Volume Channels for Rapid Qualification
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Solution Overview
Problem
Existing chromatography system qualification methods using chromatographic columns are time-consuming due to equilibration requirements, and alternative methods like tubing do not ensure homogenous solvent-sample composition or provide controlled peak shape and back-pressure.
Innovation Solution
A mixer design with inlet and outlet manifold channels and transfer channels of varying lengths, volumes, and cross-sectional areas, along with optional intermediate channels and flow restrictors, to emulate chromatographic column behavior and ensure homogenous mixing and controlled back-pressure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a chromatographic column is used for qualification, then predictable control of peak shape and system performance measurement is achieved, but the system requires lengthy equilibration time (3-24 hours) before qualification can be performed
Solution Approach 1:
The patent creates a simplified copy of chromatographic column behavior using a mixer with controlled flow paths and volumes. The mixer replicates the essential function of peak shape control and composition homogenization without requiring the lengthy equilibration period of a real chromatographic column, thus achieving qualification purposes in a fraction of the time
Solution Approach 2:
The patent extracts the critical functionality of chromatographic columns (peak shape control, composition mixing, back-pressure provision) and implements it through a simplified mixer structure. By taking out only the essential functions needed for qualification rather than using the complete chromatographic column system, the equilibration time requirement is eliminated while maintaining measurement capability
2Measurement precision
If chromatographic columns are used for qualification, then system performance can be measured, but each column exhibits different behavior due to variations in stationary phase packing, undermining qualification accuracy
Solution Approach 1:
The patent implements precisely controlled local properties within the mixer, specifically engineered flow path volumes and geometries that ensure consistent fluid dynamics. Unlike chromatographic columns where stationary phase packing varies, the mixer's internal geometry is manufactured to tight tolerances, ensuring that each mixer unit behaves identically and providing stable, reproducible qualification results
Solution Approach 2:
The patent changes the physical parameters of the mixing system from variable (chromatographic column packing) to controlled and consistent (mixer flow path volumes, channel dimensions, and geometries). By defining and controlling these parameters during manufacturing, the system achieves behavioral consistency across multiple qualification runs and between different mixer units
3Loss of time
If tubing is used instead of chromatographic column, then equilibration time is reduced, but the solvent and sample composition remains non-homogenous and peak shape cannot be controlled
Solution Approach 1:
The patent segments the flow path into multiple controlled channels with specific volume ratios. This segmentation allows different portions of the solvent and sample to travel through paths of different lengths and volumes, then recombine to create a homogenous mixture. The segmented structure provides controlled dispersion and mixing that simple tubing cannot achieve, while maintaining rapid response times
4Loss of time
If tubing is used instead of chromatographic column, then setup time is reduced, but adequate back-pressure cannot be applied to the system
Solution Approach 1:
The patent designs the mixer with dynamic flow characteristics that provide back-pressure proportional to the flow rate. The controlled resistance elements and flow path geometry create a dynamic pressure profile that mimics chromatographic column behavior, providing adequate back-pressure during qualification while maintaining rapid setup. The system adapts its pressure characteristics to the operating conditions rather than requiring fixed, high resistance
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 mixer provides rapid and accurate emulation of chromatographic column performance, reducing setup time and ensuring consistent fluid composition, while maintaining predictable peak shape and back-pressure.
Implementation Method 1
The transfer channels have different volumes to delay fluid propagation to a corresponding extent
Implementation Method 2
The plurality of transfer channels may include a flow restrictor
Implementation Method 3
The respective fluid connections are distributed along each of the inlet and outlet manifolds channels
Data Source
AI summary
Described is a mixer for a chromatography system. The mixer includes an inlet manifold channel, an outlet manifold channel and a plurality of transfer channels. The inlet manifold channel has an inlet at a proximal end of the inlet manifold channel for receiving an inlet flow. The transfer channels are fluidly connected between the inlet and outlet manifold channels. The respective fluid connections are distributed along each of the inlet and outlet manifolds channels. The transfer channels have different volumes. The mixer may be formed of a plurality of layer and the layers may be diffusion bonded to each other.