Flow Metered Analyzer With MEMS Flow Sensor
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Solution Overview
Problem
Hematology analyzers and flow cytometers face challenges in accurately measuring flow rates and volumes, leading to potential errors in blood counts and sample analysis, particularly at low flow rates, due to the limitations of indirect measurement methods and the need for precise, miniaturized, and cost-effective solutions for point-of-care applications.
Innovation Solution
The integration of a micro-scale flow sensor using MEMS technology for direct and local measurement of flow rates, combined with a closed-loop pumping system and disposable cartridges with embedded fluidic circuits, enables precise flow rate monitoring and compensation, enhancing the accuracy of blood counts and diagnostics in hematology analyzers and cytometers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If indirect measurement methods are used for flow rates, then device complexity is reduced, but measurement precision deteriorates
Solution Approach 1:
The patent replaces indirect mechanical measurement methods with direct flow sensing using micro-scale sensors integrated into the fluidic circuit. This substitution enables precise direct measurement of flow rates and volumes, resolving the contradiction by achieving high measurement precision through advanced sensor technology while maintaining manageable device complexity through integration.
Solution Approach 2:
The patent introduces micro-scale flow sensors as intermediaries within the fluidic circuit to directly sense flow rates and volumes. These sensors act as mediators between the fluid flow and the measurement system, enabling accurate direct measurement without complex indirect methods, thus resolving the technical contradiction.
2Productivity
If miniaturized sensors are integrated into cartridges, then productivity is improved through point-of-care testing, but manufacturing precision requirements increase
Solution Approach 1:
The patent divides the hematology analyzer into modular components, with miniaturized flow sensors integrated into disposable cartridges. This segmentation allows the complex sensing functionality to be concentrated in standardized, pre-manufactured cartridges, reducing the manufacturing precision burden on the main instrument while enabling widespread point-of-care deployment.
Solution Approach 2:
The patent employs disposable cartridges containing integrated micro-scale sensors. These single-use cartridges encapsulate the precision sensing technology, allowing high manufacturing precision to be achieved once during cartridge production, while the main instrument remains simple and portable for point-of-care use, thus resolving the productivity-precision contradiction.
3Measurement precision
If direct flow sensing is implemented, then measurement precision is improved, but device complexity increases
Solution Approach 1:
The patent implements closed-loop flow control using micro-scale flow sensors that provide real-time feedback on flow rates and volumes. This feedback mechanism enables precise measurement and control of fluid dynamics, improving blood count accuracy while managing system complexity through automated feedback-based regulation rather than complex manual control systems.
Solution Approach 2:
The patent employs self-regulating flow control systems where micro-scale sensors automatically monitor and adjust flow parameters without external intervention. The system uses built-in feedback loops to maintain optimal flow conditions, achieving high measurement precision while minimizing the complexity of external control mechanisms.
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 provides accurate and reliable flow rate measurements, reducing errors and enabling precise blood counts per unit volume, while also facilitating self-diagnostics for bubble detection, leaks, and occlusions, thus improving the overall performance and reliability of miniaturized hematology analyzers for point-of-care use.
Implementation Method 1
The integration of a micro-scale flow sensor using MEMS technology for direct and local measurement of flow rates
Implementation Method 2
combined with a closed-loop pumping system and disposable cartridges with embedded fluidic circuits, enables precise flow rate monitoring and compensation
Data Source
AI summary
A hematology analyzer or cytometer cartridge system having flow metering. It may have on- or off-cartridge flow metering and control. The system may have local and direct flow measurement to provide accurate counts per unit volume. There may be numerous arrangements for fluidic circuit checks of the cartridge. Examples may include checks pertaining to zero flow, interface, pressure, flow rate, fluid type and quality, backflow, dry qualification, temperature exposure limits, and so on, of the circuits and cartridge associated items.