Optical Coagulation Assay Reference Design for Rapid Point-of-Care Testing
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Solution Overview
Problem
Existing coagulation assays face challenges such as slow turnaround time, large sample size requirements, high production costs, and instability of reagents, making them unsuitable for near-real-time point-of-care testing in emergency settings.
Innovation Solution
A compact point-of-care coagulation assay system using a reaction chamber, excitation light source, optical reference, and optical receiver, which allows for rapid coagulation detection with minimal sample volume and reduced reagent reliance, utilizing fluorescence-based methods to decouple fluorescence signal from chemical reactions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If traditional coagulation assays are used, then accurate coagulation measurement is achieved, but turnaround time becomes too long (days to weeks)
Solution Approach 1:
The patent extracts the measurement function from complex centralized laboratory systems and implements it in a simplified point-of-care device. The optical detection system directly measures coagulation in a small reaction chamber without requiring complex sample preparation mechanisms, reagent storage systems, or automated measurement units found in traditional instruments.
Solution Approach 2:
The patent replaces mechanical/chemical measurement methods with optical detection. Instead of using complex mechanical sample preparation and chemical reagent reactions that take days to weeks, the system uses light absorption measurements to detect coagulation in real-time, achieving near-instantaneous results.
2Reliability
If traditional coagulation assays are used, then reliable coagulation data is obtained, but large blood volume (more than 1 mL) is required
Solution Approach 1:
The patent uses a micro-scale reaction chamber that nests the coagulation measurement process into a tiny volume. The reaction chamber is designed to hold only a small amount of blood sample, and the optical detection system is scaled down to detect coagulation within this confined space, enabling reliable measurement with minimal sample volume.
Solution Approach 2:
The patent changes the detection parameter from chemical/mechanical methods requiring large volumes to optical absorption measurements that are sensitive enough to detect coagulation in micro-volumes. The system measures light absorption changes in the small reaction chamber to detect fibrin formation, achieving reliable results with much smaller sample sizes.
3Loss of time
If fluorescence-based methods with microfluidic sample preparation are used, then turnaround time is reduced, but reliability decreases due to low reaction efficiency and immunoreactive fragment instability
Solution Approach 1:
The patent uses a disposable microplate well as the reaction chamber that is pre-coated with reagents. This eliminates the need for stable immunoreactive fragments and complex microfluidic systems. The simple, disposable nature of the well ensures consistent performance while enabling rapid measurement without the reliability issues of fragile chemical reagents.
Solution Approach 2:
The patent replaces the chemical fluorescence-based detection method with optical absorption measurement. This substitution eliminates dependence on unstable immunoreactive fragments and low-efficiency chemical reactions, providing reliable results through direct physical measurement of light absorption changes during coagulation.
4Reliability
If industry quality control requirements are applied to chemical production and instrument manufacturing, then product quality is improved, but production cost increases excessively
Solution Approach 1:
The patent uses inexpensive disposable microplate wells instead of expensive, precisely manufactured instruments. The wells are mass-produced using simple coating techniques and can be discarded after single use, eliminating the need for costly quality control in instrument manufacturing and complex chemical production while maintaining consistent assay performance.
Solution Approach 2:
The disposable well contains pre-coated reagents that self-perform the sample preparation and measurement functions. This eliminates the need for separate, expensive instrument components and complex manufacturing processes, significantly reducing production costs while maintaining quality through standardized well production.
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 fast turnaround times, reduced sample requirements, lower costs, and reliable quality control, facilitating point-of-care testing in emergency rooms and other settings.
Implementation Method 1
an optical reference for providing an optical signal... an optical receiver... The optical reference is positioned to absorb the excitation light and generates the optical signal to the optical receiver
Data Source
AI summary
An assay system includes an excitation light source to output excitation light having a first wavelength; an optical reference positioned to absorb the excitation light from the excitation light source and to output an optical signal based on the excitation light, where the optical signal has a second wavelength that is different from the first wavelength; a reaction chamber containing a reactant and an inlet to receive a test sample to produce a fluid that is based on the test sample and the reactant, where the reaction chamber is positioned to receive the optical signal from the optical reference; and an optical receiver positioned to detect an amount of the optical signal that passed through the reaction chamber containing the fluid.