Closed-Chamber Cell Culture Pressure and pH Feedback Control
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Solution Overview
Problem
Existing in vitro cell culture methods lack the ability to control pressure and dissolved gas concentration/pH in closed chambers, compromising the simulation of in vivo microenvironments and limiting long-term cell culture viability.
Innovation Solution
A method and system for controlling pressure and dissolved gas concentration/pH in a closed chamber by injecting and extracting fluid at controlled flow rates and pressures, using sensors and a controller to maintain predetermined conditions, with a feedback loop for real-time adjustments.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional in vitro cell culture methods are used in closed chambers, then cell culture simplicity and ease of operation are maintained, but the ability to control pressure and dissolved gas concentration/pH is lost, compromising the simulation of in vivo microenvironments and limiting long-term cell culture viability
Solution Approach 1:
The control system is segmented into independent functional modules: a fluid injection module for controlling dissolved gas concentration and pH, a pressure control module for applying mechanical stress, and a sensor module for monitoring parameters. Each module operates independently but coordinates through the central controller, allowing precise control of each parameter without requiring complete system redesign.
Solution Approach 2:
The system implements closed-loop feedback control where sensors continuously monitor pressure, dissolved gas concentration, and pH in the culture medium. These measurements are fed back to the controller, which automatically adjusts the fluid injection rate and pressure application to maintain predetermined target values, ensuring long-term stability and cell viability.
2Adaptability or versatility
If pressure control is added to simulate in vivo conditions, then the physiological relevance of the model is improved, but the device complexity and difficulty of operation increase
Solution Approach 1:
The pressure control mechanism is integrated into the existing closed chamber culture system, allowing the same device to perform both standard cell culture and mechanotransduction studies. The controller can operate in multiple modes: simple incubation without pressure, constant pressure application, or dynamic pressure cycling, making the system universally applicable to various experimental needs without requiring separate dedicated equipment.
3Manufacturing precision
If fluid injection is used to control dissolved gas concentration and pH, then the chemical environment control is improved, but the system complexity and energy consumption increase
Solution Approach 1:
The system applies fluid injection in a controlled, partial manner rather than continuous full-flow operation. The controller adjusts the injection rate to provide just enough fluid exchange to maintain dissolved gas concentration and pH within target ranges, avoiding excessive fluid replacement that would waste energy and reagents while still achieving precise chemical environment control.
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 method allows for precise control of environmental conditions in closed chambers, mimicking in vivo microphysiological conditions and maintaining cell viability for long-term studies, enabling accurate phenotypic changes and therapeutic testing.
Implementation Method 1
the fluid moving within said volume of liquid cell culture medium resulting from the injection and/or the extraction involves a change in a local pressure of the volume of liquid cell culture medium (VL) applied to said cultured biological entity
Implementation Method 2
measuring an internal pressure inside said at least one closed chamber, and a dissolved gas concentration and/or a pH of the volume of liquid cell culture medium by at least a pressure sensor
Implementation Method 3
measuring an internal pressure inside said at least one closed chamber, and a dissolved gas concentration and/or a pH of the volume of liquid cell culture medium by at least a pressure sensor, and a dissolved gas concentration sensor and/or a pH sensor
Data Source
Figure 1~3
Figure 4~5
AI summary
The invention concerns a method for controlling pressure and dissolved gas concentration and/or pH of a volume of liquid cell culture medium (VL) contained in at least one closed chamber (1) which comprises a cultured biological entity (3) which is composed of at least one cell. The method comprises a step of determining a local pressure of the volume of liquid cell culture medium (VL) applied to said cultured biological entity (3) based on measurements of an internal pressure inside said at least closed chamber (1), a dissolved gas(es) concentration and/or pH of said volume of liquid cell culture medium (VL), and adjusting, by a controller (4), the flow rate of the moving fluid (2) within said volume of liquid cell culture medium (VL) resulting from the injection and/or the extraction to control said local pressure regarding said measurements.