Microfluidic Optical Detection for Blood Coagulation Testing
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Solution Overview
Problem
Existing microfluidic systems for testing biological fluids, such as blood, are not reliable, efficient, or economically feasible for performing coagulation and agglutination tests, as they often require complex setups and struggle with accurate measurement of reaction times.
Innovation Solution
A microfluidic system with a planar microfluidic device featuring a flow channel with a detection channel section and an optical detector, where the optical detector transmits light onto an aperture section to detect changes in optical properties over time, allowing for reliable and efficient testing of biological fluids by measuring changes in light transmission or reflection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If complex microfluidic systems are used for testing biological fluids, then measurement capability is improved, but device complexity increases
Solution Approach 1:
The microfluidic device is divided into distinct functional sections: a reaction chamber for mixing samples with reagents, a separation channel for isolating components, and a detection zone with optical detectors. This segmentation allows each section to perform its specific function efficiently while keeping the overall device design manageable and not overly complex.
2Measurement precision
If optical detectors are used to determine changes in blood samples, then measurement precision is improved, but device complexity increases
Solution Approach 1:
The optical detection system is integrated directly into the microfluidic chip structure, with detectors positioned at specific locations within the device to monitor reactions in real-time. This merging of detection functionality into the fluidic pathway eliminates the need for separate complex external measurement systems, thereby improving measurement precision without proportionally increasing overall device complexity.
3Measurement precision
If flow rate control is adjusted to control incubation time, then measurement precision is improved, but ease of operation deteriorates
Solution Approach 1:
The microfluidic device incorporates passive flow control mechanisms such as capillary forces, pressure gradients, or integrated micro-pumps that automatically regulate flow rates through the channels. This self-regulating flow control ensures consistent incubation times and reaction conditions without requiring manual adjustment by the operator, thereby maintaining measurement precision while preserving ease of operation.
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 system provides a simple, fast, and economically feasible method for performing tests by accurately determining changes in biological fluids, such as coagulation or agglutination reactions, through precise measurement of optical properties over time, enhancing reliability and efficiency.
Implementation Method 1
The optical detector is arranged to transmit light onto an aperture section of the microfluidic device and to determine at least one optical property of the aperture section as a function of time
Implementation Method 2
measuring changes in light transmission or reflection
Data Source
AI summary
The invention relates to a microfluidic system comprising a microfluidic device having a first and a second opposite surfaces and an optical detector, the microfluidic device comprises a flow channel with a detection channel section having a length of at least about 1 mm, the microfluidic device comprises at least one aperture section comprising at least a part of said detection channel section and a transparent window into said detection channel section, the optical detector is arranged to determine at least one optical property of said aperture section as a function of time. The flow channel may have capillary dimensions and/or it may wholly or fully be arranged to drive a fluid flow by applying external forces. The microfluid device may be used to determine various properties of a sample fluid, for example it may be used to determine a samples coagulation properties and/or reactions of one or more components in a fluid sample as a function of time.