Process and device for generating an alarm during a machine-assisted patient ventilation
First Claim
1. A process for generating an alarm during a machine-assisted ventilation of a patient, the process comprising the steps of:
- measuring a minute volume during machine-assisted ventilation of a patient;
determining a median of the measured minute volume;
inputting a lower critical limit value of the minute volume and inputting a time delay, with which time delay an alarm is generated after undershooting the lower critical limit value of the minute volume, in a control device;
determining with the control device a reference signal that is a function of the input lower critical limit value for the minute volume and the input time delay based on the determined median of the minute volume, from which reference signal are derived an alarm limit value located below the lower critical limit value as well as a maximum tolerated duration of apnea of the patient; and
generating an alarm signal during the machine-assisted ventilation of the patient both during an undershooting of the lower critical limit value for a period of time that is longer than the input time delay and during an undershooting of the alarm limit value.
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Accused Products
Abstract
A device and process generates an alarm during a machine-assisted ventilation of a patient. A minute volume is measured and a median of the minute volume and a lower critical limit value of the minute volume and a time delay are determined and are recorded in a control device. A reference signal is determined as a function of the lower critical limit value for the minute volume and the time delay based on the median of the minute volume. From the reference signal an alarm limit value located below the lower critical limit value as well as a value for a maximum tolerated duration of apnea of the patient are derivable. An alarm signal is generated both during an undershooting of the lower critical limit value over a period of time that is longer than the established time delay and during an undershooting of the alarm limit value.
17 Citations
27 Claims
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1. A process for generating an alarm during a machine-assisted ventilation of a patient, the process comprising the steps of:
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measuring a minute volume during machine-assisted ventilation of a patient; determining a median of the measured minute volume; inputting a lower critical limit value of the minute volume and inputting a time delay, with which time delay an alarm is generated after undershooting the lower critical limit value of the minute volume, in a control device; determining with the control device a reference signal that is a function of the input lower critical limit value for the minute volume and the input time delay based on the determined median of the minute volume, from which reference signal are derived an alarm limit value located below the lower critical limit value as well as a maximum tolerated duration of apnea of the patient; and generating an alarm signal during the machine-assisted ventilation of the patient both during an undershooting of the lower critical limit value for a period of time that is longer than the input time delay and during an undershooting of the alarm limit value. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A process for generating an alarm during a machine-assisted ventilation of a patient, the process comprising the steps of:
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measuring a minute volume during machine-assisted ventilation of a patient; determining a median of the minute volume; inputting a lower critical limit value of the minute volume and inputting a maximum tolerated duration of apnea of the patient in a control device; determining with the control device a reference signal that is a function of the input lower critical limit value for the minute volume and the input maximum tolerated duration of apnea based on the median of the minute volume, from which are derived an alarm limit value located below the lower critical limit value as well as a time delay, with which time delay an alarm is issued after undershooting the lower critical limit value; and generating an alarm signal during the machine-assisted ventilation of the patient both during an undershooting of the lower critical time value for a period of time that is longer than the established tolerated duration of apnea and during an undershooting of the alarm limit value. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18, 19, 20, 21)
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22. A control device, for generating an alarm during a machine-assisted ventilation of a patient, the control device being configured to execute a process comprising the steps of:
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receiving measured minute volume values during the machine-assisted ventilation of the patient; determining a median of the measured minute volume; receiving a lower critical limit value of the minute volume input setting and the receiving another input setting that is one of a time delay input setting, with which time delay an alarm is generated after undershooting the lower critical limit value and a maximum tolerated duration of apnea input setting in the control device; determining a reference signal that is a function of the lower critical limit value for the minute volume input setting and said another input setting that is one of; the time delay, based on the median of the minute volume; and the maximum tolerated duration of apnea based on the median of the minute volume, from which are derived an alarm limit value located below the lower critical limit value as well as the time delay, with which an alarm is issued after undershooting the lower critical limit value; and generating an alarm signal during an undershooting of the alarm limit value by the measured minute volume and also during an undershooting of the lower critical limit value for a period of time that is longer than the established time delay by the measured minute volume. - View Dependent Claims (23)
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24. A device for monitoring a patient under machine-assisted ventilation, the device comprising:
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an input unit; an output unit; an analysis unit; and at least one data link for data transfer between the analysis unit and a ventilator, wherein; the analysis unit receives values of a measured minute volume, that are fed to the analysis unit via the data link; the analysis unit is configured to determine a median of the minute volume on the basis of the measured minute volume; the input unit comprises a menu navigation which receives an input of a lower critical limit value of the minute volume and a time delay, with which an alarm signal, after undershooting the lower critical limit value for a period of the time delay, is generated; the lower critical limit value of the minute volume and the time delay value are fed via the data link to the analysis unit; at least one reference signal that is a time behavior of a filtered minute volume signal is determined in the analysis unit, the reference signal being based on the input lower critical limit value for the determined median of the minute volume and the input time delay setting based on the determined median of the minute volume, which reference signal determines an alarm limit value, located below the lower critical limit value, as well as a maximum tolerated duration of apnea of the patient; and an optically and/or acoustically perceptible alarm signal is issued via the output unit during machine-assisted ventilation upon an undershooting of the lower critical limit value for a period of time which is longer than the established time delay by the measured minute volume and upon an undershooting of the alarm limit value by the measured minute volume. - View Dependent Claims (25, 26, 27)
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Specification