Engineered Hydrogel Particles for Hematology Analyzer Calibration
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Solution Overview
Problem
Existing hematology analyzers rely on costly and laborious procedures for calibration using purified red blood cells, which can introduce batch-to-batch variation and require cells from endangered species, necessitating the development of synthetic compositions that mimic red blood cells for accurate calibration.
Innovation Solution
Engineered hydrogel particles with tunable optical and electrical properties, incorporating hemoglobin-like molecules or dyes, are developed to mimic the impedance and absorbance of red blood cells, allowing for calibration without the need for purified cells.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If purified red blood cells are used for calibration, then measurement accuracy is maintained, but cost increases and batch-to-batch variation occurs
Solution Approach 1:
The patent creates synthetic control particles that replicate the key physical and optical properties of red blood cells (size, shape, impedance, light scattering characteristics) without using actual biological cells. This copying approach eliminates the need for costly purified cell preparations while maintaining calibration accuracy, directly resolving the contradiction between measurement precision and ease of manufacture
Solution Approach 2:
The invention modifies calibration approaches by changing from biological parameters (actual red blood cells with variable physiological states) to controlled physical parameters (synthetic particles with precisely defined size, impedance, and optical properties). This parameter transformation enables consistent, cost-effective calibration while preserving measurement precision
2Measurement precision
If purified red blood cells are used for calibration, then calibration can be performed, but labor requirements increase and time is consumed
Solution Approach 1:
The synthetic control particles are pre-manufactured with defined properties and can be stored for future use, eliminating the need for time-consuming cell isolation and preparation steps at the time of calibration. This preliminary preparation of calibration standards directly reduces calibration preparation time while maintaining accuracy
3Ease of manufacture
If synthetic particles are used instead of purified cells, then cost is reduced and variability is minimized, but measurement accuracy may be compromised
Solution Approach 1:
The synthetic particles are designed to possess only the specific local qualities relevant to hematology analyzer calibration (size, impedance, light scattering properties) while eliminating irrelevant biological variability. This selective quality approach ensures cost-effectiveness and consistency without compromising measurement precision in the parameters that actually matter for calibration
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 engineered particles enable accurate calibration of hematology analyzers, reducing costs and variability, while maintaining the precision of measurements for red blood cell characteristics.
Implementation Method 1
Electrical impedance-based methods are rooted in the Coulter Principle. During such electrical impedance-based methodologies, whole blood can be passed between two electrodes through an aperture narrow enough that only a single cell can pass through at a time. Impedance between the electrodes changes as the cell passes therebetween and is proportional to cell volume
Implementation Method 2
Optics-based flow cytometry relies on directing a beam of light onto a hydrodynamically-focused stream of liquid. A number of detectors are then aimed at the point where the stream passes through the light beam: one in line with the light beam (Forward Scatter or FSC) and several perpendicular to it (Side Scatter or SSC). FSC correlates with the cell volume and SSC depends on the inner complexity of the particle
Data Source
AI summary
Provided herein are red blood cell control compositions containing one or more populations of lysable hydrogel particles having an impedance that is substantially similar to the impedance of a human red blood cell of average diameter; and a population of hemoglobin molecules or a population of dye molecules that have substantially similar absorbance as hemoglobin; wherein (i) and/or (ii) are present in an amount that corresponds to a normal blood sample or disease state, or (i) and (ii) are present at a ratio that corresponds to a normal blood sample or disease state.