Microfluidic Flow Control for Continuous Metabolite Calibration
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Solution Overview
Problem
Current sensors for monitoring metabolites in bodily fluids, such as glucose and lactate, face challenges in providing real-time, continuous analysis due to limitations in temporal resolution and sensitivity, especially in dynamic conditions like brain injury or sports performance, where rapid changes in metabolite levels need to be detected accurately without artifacts from flow rate variations.
Innovation Solution
A microfluidic flow controller system that maintains a steady flow rate through analysis modules during both analysis and calibration modes, using valves and pumps to alternate between analyte and calibration fluids, ensuring accurate data collection and minimizing artifacts from flow rate changes, combined with a microfluidic analysis module that allows for precise positioning of needle sensors within the flow conduit for optimal sensitivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If sensors are used to monitor metabolite levels in bodily fluids, then real-time continuous analysis is enabled, but artifacts from flow rate variations reduce measurement accuracy
Solution Approach 1:
The patent replaces mechanical flow control with a microfluidic chip-based system that uses integrated channels and passive flow management structures. This eliminates the need for external pumps and valves that cause flow rate variations, providing stable and artifact-free metabolite level measurements through inherent microfluidic flow characteristics
Solution Approach 2:
The patent introduces a microfluidic chip as an intermediary between the fluid sample and the sensor. This chip contains integrated channels, mixing zones, and flow control structures that mediate the flow to ensure stable, artifact-free conditions while maintaining continuous monitoring capability
2Speed
If flow rate is increased to improve response time, then temporal resolution is improved, but measurement artifacts increase
Solution Approach 1:
The patent employs dynamic flow management within the microfluidic chip, using integrated channels of varying dimensions and passive mixing structures that adapt flow characteristics in real-time. This allows rapid response to metabolite level changes while maintaining stable flow conditions that prevent measurement artifacts
3Measurement precision
If calibration is performed frequently to maintain accuracy, then measurement precision is improved, but analysis time is reduced
Solution Approach 1:
The patent merges the calibration function with the continuous analysis workflow by integrating calibration fluid delivery channels directly into the microfluidic chip. Calibration can be performed rapidly by simply switching fluid sources, eliminating separate calibration procedures and minimizing analysis time while maintaining high precision
Data Source
AI summary
A microfluidic flow controller for receiving analyte fluid and calibration fluids wherein the flow controller is configured to switch between (i) an analysis mode in which analyte fluid is passed to an analysis module and (ii) a calibration mode in which the analyte fluid is passed to an alternative destination and calibration fluid is passed to the analysis module, thereby maintaining flow rate of analyte fluid from a source and maintaining a steady flow rate of fluid through the analysis module in both analysis mode and calibration mode. The flow controller may vary the ration of multiple calibration fluids during a calibration mode. Means for accurately positioning sensors within a flow conduit of the analysis module is also described. Sensors are also described for use with or without the microfluidic flow controller for the detection of metabolites and molecules. The sensors may or may not comprise enzymes and may be used with a sensing reagent, also described.