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Automatic control of isolated organ perfusion
A Prenger-Berninghoff1, M Hexamer, U Schütt
1Department of Biomedical Engineering, Medical Faculty, University Centre of Medical Engineering, Ruhr-University Bochum, Germany. prenger@biomed.rub.de
Biomedizinische Technik. Biomedical Engineering
|December 31, 2004
Summary
Explanted hearts can maintain beating function ex vivo, enabling alternatives to animal testing and improving donor heart transport. Automatic control systems optimize these setups for better blood gas exchange and organ viability.
Area of Science:
- Physiology
- Biomedical Engineering
- Organ Transplantation
Background:
- Explanted hearts can maintain physiological function ex vivo under specific conditions.
- This capability presents opportunities for alternative research methods and improved organ preservation for transplantation.
- Current experimental setups require optimization for handling and effectiveness.
Purpose of the Study:
- To describe experimental setups for investigating isolated, beating explanted hearts.
- To optimize handling and effectiveness of these setups using automatic control.
- To analyze blood gas exchange dynamics and develop a control system for isolated heart preparations.
Main Methods:
- Investigated blood gas exchange in an isolated heart preparation (the "plant").
- Determined the transfer function for oxygen partial pressure using stepwise gas-side changes.
- Approximated transfer functions using a first-order lag element with time delay.
Main Results:
- Analyzed the dependency of time delay, gain, and time constant on blood flow rate, gas flow rate, and oxygen partial pressure.
- Developed an equation to calculate time delay based on gas and blood flow rates.
- Established correlations between gain/time constant and plant parameters.
Conclusions:
- The derived equations and correlations enable the design of adaptive controllers for isolated heart systems.
- Optimized control systems can enhance the effectiveness of ex vivo heart preparations for research and transplantation.
- This work supports the development of advanced organ preservation and experimental methodologies.