Surface Tension Normalization in Clinical Analyzer Metering Tips
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Solution Overview
Problem
Clinical analyzers face issues with random bias due to variability in sample volume and analyte recovery, primarily caused by variations in sample fluid surface tension, leading to inaccurate analyte detection and reduced consistency across different systems.
Innovation Solution
A method is introduced to normalize the surface tension of sample fluids by using a surface tension-reducing agent, which is pre-treated with a micro-tip and mixed with the sample fluid, creating a mixture that reduces adhesion of analytes to plastic surfaces and improves metering performance without adulterating the original sample or significantly slowing down the analyzer's throughput.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a surface tension-reducing agent is added to normalize surface tension, then metering precision and analyte recovery are improved, but the sample fluid is adulterated
Solution Approach 1:
The invention divides the sample processing into separate stages: a portion of the sample is treated with the surface tension-reducing agent in the reaction vessel, while the remaining sample stays untreated. This segmentation allows the treating agent to improve metering precision for the treated portion without adulterating the entire sample, resolving the contradiction between precision improvement and sample integrity.
2Measurement precision
If a surface tension-reducing agent is used to improve analyte recovery, then measurement precision is improved, but the system complexity increases
Solution Approach 1:
The invention utilizes the reaction vessel and existing metering mechanisms to perform the surface tension normalization function. The system uses its own existing components (the reaction vessel as a mixing chamber and the metering pump to add the agent) rather than requiring separate dedicated equipment. This self-service approach improves analyte recovery while minimizing the increase in system complexity.
3Reliability
If surface tension normalization is performed by mixing agent with sample, then reliability of analyte detection is improved, but productivity decreases due to additional mixing time
Solution Approach 1:
The invention merges the surface tension normalization step with the existing sample preparation and incubation processes. The surface tension-reducing agent is added to the reaction vessel where the sample is already being prepared, and the mixing is integrated into the existing workflow rather than being a separate sequential step. This merging approach improves detection reliability while minimizing the impact on productivity by utilizing existing process time.
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
This method enhances the accuracy and consistency of clinical analyzers by reducing random errors and improving analyte recovery, particularly for hydrophobic analytes, while maintaining the original sample integrity and operational efficiency.
Implementation Method 1
normalizing surface tension of a sample fluid being run on a clinical analyzer
Implementation Method 2
which may also block adhesion of analytes to plastic
Data Source
AI summary
A method of normalizing surface tension of a sample fluid on a clinical analyzer is disclosed. The method comprises aspirating a portion of a sample fluid into a metering tip, the metering tip having a lower end through which the sample fluid is aspirated and an upper end; sealing the lower end of the metering tip, forming a cuvette for the portion of the sample fluid; pre-treating a micro-tip with a surface tension-normalizing agent, and then dispensing the surface tension-normalizing agent into the sample fluid in the cuvette; mixing the surface tension-normalizing agent and the sample fluid in the cuvette using the micro-tip to create a mixture of the sample fluid and the surface tension-normalizing agent, the mixture having a normalized surface tension; and using the mixture for testing on the clinical analyzer.