Single-Dye Leukocyte Staining in Liquid Medium for Differential Counts
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Solution Overview
Problem
Current methods for leukocyte counting in clinical analytics require multiple steps, high-cost equipment, and are not suitable for manual or optical microscopy, often using unstable and costly dyes that compromise results with precipitates.
Innovation Solution
A single dye solution for leukocyte staining in liquid medium that allows instantaneous differential staining and total counting, using cresyl acetate violet and Triton X to maintain leukocyte morphology, suitable for optical microscopy and Point-of-Care devices.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If conventional dyes (Giemsa, Leishman, Romanowsky, Wright) are used for leukocyte staining, then staining effect is achieved, but multiple steps (fixation, drying, staining) are required and cells cannot be stained in liquid medium
Solution Approach 1:
The patent modifies the chemical parameters of the staining solution by using a specific dye concentration range (0.002% to 0.02% w/v) and pH range (4.0 to 6.0), enabling the dye to function effectively in liquid medium without requiring fixation and drying steps. This parameter optimization allows instantaneous staining while preserving cell morphology in suspension.
Solution Approach 2:
The patent extracts the essential staining function from the conventional multi-step process (fixation, drying, staining) and consolidates it into a single liquid medium staining step. By removing the fixation and drying requirements while maintaining staining effectiveness, the process is simplified to only require mixing the sample with the staining solution.
2Measurement precision
If Turk's liquid is used for leukocyte counting, then total white blood cell count is achieved, but differential leukocyte count is not possible
Solution Approach 1:
The staining solution is designed to perform multiple functions simultaneously: it acts as both a diluent for total leukocyte counting and a differential staining reagent. The solution contains a cationic dye that stains all leukocytes for total count while also differentiating between leukocyte types through nuclear and cytoplasmic staining, enabling both total and differential counts in the same sample without requiring separate reagents.
3Measurement precision
If multiple dyes are used for differential staining, then leukocyte differentiation is achieved, but solution stability decreases and precipitates form
Solution Approach 1:
The patent uses a single, stable cationic dye at low concentration (0.002% to 0.02% w/v) that provides sufficient differential staining capability without requiring multiple dyes. This single-dye approach maintains solution stability and prevents precipitate formation while still enabling differentiation of leukocyte types through distinct nuclear and cytoplasmic staining patterns.
Solution Approach 2:
The staining solution is formulated as a composite system containing the cationic dye, buffer components (phosphate, citrate, or acetate), and saline, optimized to work together synergistically. This composite formulation ensures solution stability, prevents precipitation, and maintains effective staining capability across the specified pH range of 4.0 to 6.0.
4Measurement precision
If automated equipment is used for blood count, then hematological parameters are obtained, but high cost and maintenance requirements prevent use in low demand locations
Solution Approach 1:
The patent creates a simplified version of automated hematology analysis that can be performed manually. By developing a staining solution that enables clear visualization and differentiation of all blood cell types (erythrocytes, leukocytes with differential staining, and platelets) in a single liquid medium step, the method replicates the capabilities of automated analyzers using simple manual microscopy, making it accessible to low-resource settings.
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
Enables simplified, cost-effective, and stable leukocyte counting in a single step, preserving cell morphology and reducing the need for complex procedures.
Implementation Method 1
comprising a cationic dye, a surfactant, an inorganic salt, and an organic or inorganic buffer
Data Source
AI summary
The invention relates to a formulation for total and differential counting of leukocytes for use in clinical analyses, in particular hemograms, to promote instantaneous differential staining of leukocytes in liquid medium, allowing greater practicality and agility in the total and differential counting of leukocytes. The practicality and agility are related to the use of a single dye for two parameters, eliminating the need for a smear. It results in a satisfactory effect for staining cells in suspension, staining the nucleus and cytoplasm of leukocytes in different shades, allowing their visualization under an optical microscope or in Point-of-Care image processing devices. It uses easily accessible raw materials, including cresyl acetate violet, ethyl alcohol, sodium and potassium chlorides, sodium hydroxide, acetic acid, triton X and deionized water, presenting a simple manufacturing process and low cost.