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Dr&auml;ger Medical Ag & Co. Kgaa

Dr&auml;ger Medizintechnik Gmbh

Dieter Weismann

Jochim Koch

Horst-Dieter Hattendorff

Michael Rehfeldt

Georg Ankerhold

Ullrich Wenkebach

A process is provided for controlling at least one parameter of the breathing gas supply of a respirator with a patient connected to it as well as to a corresponding control device. The respiration pressure, the breathing gas flow generated by the respirator as well as the respiration rate may be used as parameters. The process presents the advantage that the control of the current respiration needs of the patient are taken into account by the muscle pressure (P ), i.e., the percentage of the airway pressure caused by the patient's own effort, being maintained at a value close to zero. An airway pressure (P ) is first calculated for this purpose from previously measured values for the airway pressure (P ) and the breathing gas flow (d/dt V) and the mechanical parameters resistance (R ) and compliance (C) of the patient's lungs, which were determined therefrom, and this is subsequently compared with the actually measured value for the airway pressure (P ). The at least one parameter of the breathing gas supply of the respirator is subsequently controlled on the basis of the comparison between P and P , expressed as the muscle pressure P &equals;P &minus;P .

Process and device for controlling the breathing gas supply

A process is provided for determining the functional residual capacity (FRC) of the lungs during respiration. An environmentally friendly trace gas is used in a process and system for determining the FRC by using fluoropropanes as a trace gas. Values for the FRC can thus be calculated, resolved for individual breaths, from the expiratory trace gas concentration and the expired breathing gas volume and they can be used for determining the FRC depending on their convergence behavior.

Process for determining the functional residual capacity of the lungs

A respirator with an inhalation line (,) connected to a gas supply device (,) and with an exhalation line (,) connected to an exhalation device (,), with a Y piece (,) connecting the inhalation line (,) to the exhalation line (,), and with a patient connection (,) going out from the Y piece (,). Partial rebreathing of CO,-containing exhaled air is made possible in a simple manner by providing a switchover device (,) between the inhalation line (,) and the gas supply device (,) as well as between the exhalation line (,) and the exhalation device (,). The switchover device is designed such that the flow connection is established between the inhalation line (,) and the gas supply device (,) as well as the exhalation line (,) and the exhalation device (,) in a first switching position and there is at least a flow connection between the gas supply device (,) and the exhalation line (,) in the second switching position.

Device and process for controlling a respirator

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Gross Grönau, Germany

Dieter Weismann