Artificial Sputum Viscosity Control for TB Diagnostic Standardization
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Solution Overview
Problem
Current quality assurance procedures for tuberculosis diagnostics lack standardization and reproducibility due to variations in sputum composition, making it difficult to compare results across studies and laboratories, and existing artificial sputum materials do not accurately mimic human sputum, leading to biased quality control and validation outcomes.
Innovation Solution
A method for producing artificial sputum with a viscosity range of 30 to 480 mPa·s and mucin concentration of 6 to 18% by weight, closely resembling human sputum, using an aqueous solution with added non-human mucin and pasteurization for sterilization, which mimics the macroscopic and microscopic appearance of human sputum, allowing for standardized and reproducible quality control and training.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If human sputum samples are used for quality control and validation, then the realism and diagnostic relevance are improved, but the standardization and reproducibility deteriorate due to variations in sputum composition
Solution Approach 1:
The patent creates an artificial copy of human sputum that replicates its key properties (viscosity, mucin content, macroscopic and microscopic appearance) without using actual human samples. This artificial sputum composition serves as a standardized surrogate that maintains diagnostic realism while eliminating variability between samples
Solution Approach 2:
The patent defines specific parameter ranges for the artificial sputum (viscosity: 30-480 mPa·s, mucin concentration: 6-18% by weight) that replicate human sputum characteristics. By controlling these parameters within defined ranges, the invention achieves both realism and standardization simultaneously
2Stability of the object's composition
If existing artificial sputum materials (polyacrylamide or methylcellulose-based) are used, then the standardization is improved, but the accuracy in mimicking human sputum deteriorates, leading to biased quality control outcomes
Solution Approach 1:
The patent identifies and adjusts critical parameters (viscosity range 30-480 mPa·s, mucin concentration 6-18%) to match human sputum characteristics, moving away from fixed-composition artificial materials. This parameter optimization enables both standardization and accurate mimicry of human sputum
Solution Approach 2:
The patent uses a composite composition including mucin (6-18% by weight) in an aqueous solution, creating an artificial sputum that combines multiple components to achieve the complex properties of human sputum. This composite approach allows replication of both macroscopic appearance and microscopic characteristics
3Adaptability or versatility
If manufacturers choose different test matrices (watery suspensions, human sputum, artificial sputum) for measuring LoD, then the flexibility is improved, but the comparability of results deteriorates
Solution Approach 1:
The patent creates a universal test matrix (artificial sputum composition) that can serve multiple purposes: it can be used by all manufacturers for LoD determination, by laboratories for verification, and for various quality control applications. This single standardized matrix replaces the need for multiple different matrices while maintaining flexibility in application
Solution Approach 2:
By creating a standardized artificial sputum that copies the essential properties of human sputum, the invention provides a universal surrogate that all manufacturers can use consistently. This eliminates the variability introduced by choosing different test matrices while maintaining the diagnostic relevance of human sputum
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 artificial sputum provides realistic conditions for quality assessment and training, improving the reliability and comparability of diagnostic test results by closely mimicking human sputum, enhancing the sensitivity and specificity of TB diagnostics and quality control processes.
Implementation Method 1
a viscosity of the artificial sputum is in a range of 30 to 480 mPa·s
Implementation Method 2
pasteurization for sterilization
Data Source
Figure 1~2d
Figure 3a~3d
Figure 4A~5d
AI summary
The present invention concerns a method for preparing artificial sputum, comprising the following steps: Step (A) preparing an aqueous solution or dispersion of nutrients and Step (B) adding non-human mucin to the aqueous solution or dispersion obtained in step (A) such that the concentration of mucin is in the range of 6 to 18 percent by weight, based on the total weight of the artificial sputum, and the viscosity of the artificial sputum is in a range of 30 to 480 mPa·s. In addition, the present invention also concerns artificial sputum obtainable by said method and its use in quality assessment, validation, verification and quality control of analytic assays on sputum.