Pump-Vacuum Fluid Management for Flow Cytometer Accuracy
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Solution Overview
Problem
Existing flow cytometers face challenges in efficiently managing fluid flow rates and maintaining consistent fluid resistance, leading to variations in particle analysis accuracy due to external environmental exposure and pressure fluctuations.
Innovation Solution
A fluid management system that integrates a pump modulated sheath fluid subsystem and a vacuum modulated waste fluid subsystem, utilizing positive displacement pumps, pulsation dampers, and pressure transducers to maintain constant fluid resistance and control flow rates, ensuring closed system operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If traditional open fluid management systems are used in flow cytometers, then the system structure is simpler, but particle analysis accuracy varies due to external environmental exposure and pressure fluctuations
Solution Approach 1:
The patent implements a closed fluid management system that isolates the fluidic pathways from the external environment, creating a controlled inert environment. This prevents environmental fluctuations (temperature, pressure, contamination) from affecting particle analysis accuracy, directly resolving the contradiction between measurement precision and device complexity by prioritizing a stable measurement environment.
Solution Approach 2:
The patent incorporates pressure transducers and flow sensors that continuously monitor fluid pressure and flow rate, with feedback control mechanisms that actively adjust pump speeds and vacuum levels. This feedback system maintains constant fluid resistance and stable hydrodynamic focusing conditions, improving particle analysis accuracy while managing system complexity through automated control.
2Productivity
If pump modulated sheath fluid subsystem and vacuum modulated waste fluid subsystem are integrated, then fluid flow rates are precisely controlled, but system complexity increases
Solution Approach 1:
The patent divides the fluid management system into distinct segmented subsystems: a pump-modulated sheath fluid subsystem for precise sheath flow control, and a vacuum-modulated waste fluid subsystem for controlled waste removal. Each subsystem operates independently with dedicated control mechanisms, allowing precise fluid flow management while organizing complexity into manageable modular components.
Solution Approach 2:
The patent utilizes pneumatic principles by integrating a vacuum system that applies negative pressure to control waste fluid removal and assist in maintaining fluid flow rates. This pneumatic control mechanism, combined with hydraulic pump modulation, enables precise flow rate control through pressure differential management, resolving the contradiction between productivity and device complexity.
3Stability of the object's composition
If constant fluid resistance is maintained through active control, then particle velocity consistency improves, but energy consumption increases
Solution Approach 1:
The patent designs the fluid management system to self-regulate fluid resistance through the inherent characteristics of the pump and vacuum system interactions. The system automatically balances sheath fluid delivery and waste removal to maintain constant fluid resistance without requiring continuous active intervention, reducing energy consumption while preserving particle velocity consistency.
Solution Approach 2:
The patent dynamically adjusts operational parameters (pump speed, vacuum level) to maintain constant fluid resistance under varying conditions. By changing these parameters adaptively rather than maintaining fixed high-energy settings, the system achieves stable particle velocity while optimizing energy consumption through parameter optimization.
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 precise control over fluid flow rates, maintaining consistent particle velocity and reducing external exposure, thereby enhancing the accuracy and reliability of particle analysis in flow cytometers.
Implementation Method 1
utilizing positive displacement pumps
Implementation Method 2
vacuum modulated waste fluid subsystem
Implementation Method 3
pulsation dampers
Implementation Method 4
pressure transducers
Implementation Method 5
the particle-containing sample fluid is surrounded by a particle-free sheath fluid that forms an annular flow coaxial with the sample fluid as is passes through the detection region, thereby creating a hydrodynamically focused flow
Data Source
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AI summary
Flow rate and vacuum controlled fluid management systems for flow type particle analyzers, such as flow cytometers, are provided. Aspects of the fluid management systems include a pump modulated sheath fluid subsystem and a vacuum modulated waste fluid subsystem. Also provided are methods of using flow type particle analyzers having fluid management systems of the invention, e.g., in particle analysis applications.