Resonance Impedance Sensor for Real-Time Cell Viability Monitoring
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Solution Overview
Problem
Current methods for monitoring cell culture parameters, such as cell viability, lactate, glutamine, osmolality, pyruvate, amino acids, product purity, and trace elements, are limited by the inability to measure these parameters in real-time and in-line due to difficulties with existing sensor technologies, requiring offline sampling and analysis which can lead to contamination and reduced sterility.
Innovation Solution
A sensor system that generates multiple frequencies and uses resonance impedance spectral analysis to differentiate between viable and nonviable cells by correlating spectral parameters, allowing for real-time, in-line monitoring of cell culture reactions without the need for periodic sampling, utilizing a dielectric conformal layer for protection and biocompatibility.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If offline sampling and analysis methods are used to monitor cell culture parameters, then measurement capabilities are available for parameters like cell viability and metabolite concentrations, but real-time monitoring is not achieved and contamination risks increase
Solution Approach 1:
The patent replaces mechanical sampling and offline analysis systems with an electrical impedance-based sensing system. The sensor uses electrical signals to directly measure cell viability and other parameters in real-time within the bioreactor, eliminating the need for physical sampling, transport, and laboratory analysis, thus achieving continuous real-time monitoring without time loss
Solution Approach 2:
The patent introduces an impedance sensor as an intermediary device that indirectly measures cell viability by detecting changes in electrical impedance caused by cell properties. This intermediary approach allows real-time monitoring of cell viability without direct contact or sampling, resolving the contradiction between measurement capability and real-time response
2Measurement precision
If offline sampling is performed to analyze cell culture parameters, then parameter measurement is possible, but sterility is compromised and contamination risk increases
Solution Approach 1:
The impedance sensor acts as an intermediary that measures cell culture parameters through electrical fields without requiring physical sampling. The sensor can be sterilized and sealed within the bioreactor system, maintaining sterility while enabling continuous parameter measurement, thus resolving the contradiction between measurement capability and sterility maintenance
Solution Approach 2:
The sensor system is designed to be self-contained and sterilizable within the bioreactor environment. The sensor itself performs the measurement function without requiring external sampling operations, eliminating the sterility-compromising steps of sampling, transport, and handling, thus maintaining reliability
3Ease of operation
If conventional impedance measurement is used to monitor cell culture, then simple measurement is achieved, but differentiation between viable and nonviable cells is insufficient
Solution Approach 1:
The patent segments the impedance measurement into multiple frequency components (e.g., low frequency, mid frequency, high frequency) that probe different aspects of cell properties. By analyzing the differential response at these segmented frequency points, the system can distinguish between viable and nonviable cells while maintaining the simplicity of electrical measurement
Solution Approach 2:
The patent adds the frequency dimension to the conventional single-point impedance measurement. By measuring impedance across multiple frequencies rather than a single value, the system creates a spectral fingerprint that enables differentiation of cell viability states while extending the simple electrical measurement approach into a more informative multidimensional measurement
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
Enables simultaneous, independent, and real-time determination of viable and nonviable cell concentrations, enhancing sterility and reducing contamination risks, while providing more accurate and comprehensive monitoring of cell culture parameters compared to conventional methods.
Implementation Method 1
A sensor system that generates multiple frequencies and uses resonance impedance spectral analysis to differentiate between viable and nonviable cells
Implementation Method 2
receiving a signal from the sensor, wherein the signal is representative of resonance impedance spectra of the cell culture reaction over a measured spectral frequency range
Implementation Method 3
utilizing a dielectric conformal layer for protection and biocompatibility
Data Source
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AI summary
Provided herein are techniques for identification of viable and nonviable cells in a cell culture that include measuring a resonance impedance spectral response of at least one resonator in proximity to the cell culture and correlating the measured response to the concentration of viable cells in cell culture and/or the concentration of nonviable cells in cell culture.