Microfluidic Measurement Chip with Integrated Waste Channel
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Solution Overview
Problem
Current microfluidic devices face challenges in accurately controlling flow rates through measurement chips, leading to imprecision in Full Blood Count (FBC) measurements due to manufacturing tolerances and the need for large or small matching elements in waste channels, which complicates the tuning of fluidic resistance networks.
Innovation Solution
A microfluidic device design where both the sample and waste channels are manufactured in the same process, ensuring a predefined ratio of fluidic resistances to control flow rates, allowing the waste stream to be fed through the measurement chip, thereby reducing manufacturing complexity and cost by omitting the need for a matching element.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If separate manufacturing processes are used for microfluidic resistance network and measurement chip, then manufacturing flexibility and modularity are improved, but manufacturing precision and flow rate control deteriorate due to accumulated tolerances
Solution Approach 1:
A matching element is introduced as an intermediary component in the waste channel to compensate for flow rate variations caused by manufacturing tolerances. This matching element acts as a flow resistance regulator that balances the fluidic resistance between the sample channel and waste channel, thereby maintaining precise flow rate control despite separate manufacturing processes.
Solution Approach 2:
The fluidic resistance parameters of the waste channel are adjusted by incorporating a matching element with specific resistance characteristics. This parameter modification allows the waste channel to compensate for variations arising from separate manufacturing, ensuring that the flow rate ratio between sample and waste channels remains precise.
2Measurement precision
If matching elements are added to waste channels to control flow rates, then flow rate precision is improved, but device complexity and manufacturing cost increase
Solution Approach 1:
The matching element is designed to perform multiple functions: it provides flow resistance matching, compensates for manufacturing tolerances, and maintains flow rate precision. By consolidating these functions into a single component, the overall device complexity is minimized while achieving the desired flow control.
Solution Approach 2:
The matching element is designed as a simple, inexpensive component that can be easily manufactured and integrated. Its straightforward structure and single-purpose function make it a cost-effective solution for achieving precise flow rate control without significantly increasing device complexity.
3Measurement precision
If matching elements are added to waste channels to control flow rates, then flow rate precision is improved, but manufacturing cost increases
Solution Approach 1:
The matching element is designed as a simple, inexpensive component that can be easily manufactured using standard microfluidic fabrication techniques. Its straightforward structure minimizes material usage and manufacturing steps, making it a cost-effective solution for achieving precise flow rate control.
Solution Approach 2:
By adjusting the fluidic resistance parameter of the waste channel through the matching element, the system achieves precise flow rate control without requiring expensive manufacturing processes. The matching element's resistance is optimized to compensate for tolerances, reducing the need for costly post-manufacturing adjustments.
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 approach enhances the controllability and accuracy of flow rates, improving the precision of FBC measurements by minimizing variability in channel dimensions and manufacturing tolerances, resulting in more reliable and cost-effective microfluidic devices.
Implementation Method 1
the sample channel having a first fluidic resistance, and a waste channel having a second fluidic resistance, wherein the ratio between the first fluidic resistance and the second fluidic resistance is predefined to ensure a predetermined flow rate through the sample channel
Data Source
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AI summary
A measurement chip (100) is disclosed for use with a microfluidic resistance network (20) comprising a microfluidic sample preparation stage (34, 38), a sample outlet (42) and a waste outlet (44) both in fluidic communication with said preparation stage. The measurement chip comprises a sample channel (104) for receiving a sample from said sample outlet (42), the sample channel comprising measurement means (120, 130) and having a first fluidic resistance; and a waste channel (114) for receiving a waste stream from said waste outlet (44) and having a second fluidic resistance.