Anesthesia ventilator for the automated ventilation of a patient

1. An anesthesia ventilator for automated ventilation of a patient, the anesthesia ventilator comprising:

an expiratory port and an inspiratory port for connecting a ventilation tube for supplying a breathing gas to the patient;

a breathing gas delivery unit;

at least one breathing gas sensor for detecting an anesthetic gas concentration;

at least one pressure sensor for detecting a pressure of the breathing gas;

at least one computer, wherein the at least one computer is configured to:

actuate the breathing gas delivery unit as a function of the detected pressure and of a preset desired pressure value; and

perform an adaptation of the desired pressure value as a function of the detected anesthetic gas concentration.

2. An anesthesia ventilator in accordance with claim 1 , wherein the at least one computer is further configured to:

determine a mean alveolar anesthetic gas concentration as well as an end-expiratory anesthetic gas concentration on the basis of the detected anesthetic gas concentration; and

perform the adaptation of the desired pressure value as a function of the determined mean alveolar anesthetic gas concentration as well as a function of the determined end-expiratory anesthetic gas concentration.

3. An anesthesia ventilator in accordance with claim 1 , further comprising:

at least one volume flow sensor for detecting a volume flow of the breathing gas, the at least one breathing gas sensor being configured for detecting a carbon dioxide concentration in the breathing gas, wherein:

the at least one computer is further configured to perform the adaptation of the desired pressure value as a function of the detected volume flow and as a function of the detected carbon dioxide concentration.

4. An anesthesia ventilator in accordance with claim 3 , wherein the at least one computer is further configured to:

determine a tidal volume fed to the patient on the basis of the detected volume flow;

determine an end-expiratory carbon dioxide concentration on the basis of the detected carbon dioxide concentration; and

perform, furthermore, the adaptation of the desired pressure value as well as of a minimum ventilation rate as a function of:

the determined tidal volume;

an upper volume limit value;

and a lower volume limit value;

the determined end-expiratory carbon dioxide concentration;

an upper concentration limit value; and

a lower concentration limit value.

5. An anesthesia ventilator in accordance with claim 4 , wherein the at least one computer is further configured to:

detect a desired operating state concerning the automated ventilation as a function of:

the determined tidal volume;

the determined end-expiratory carbon dioxide concentration;

another preset volume limit value;

another preset concentration limit value;

the current desired pressure value;

a preset desired pressure limit value; and

output, in case of detection, an output signal, which indicates the presence of the desired operating state, to a clinician.

6. An anesthesia ventilator in accordance with claim 1 , wherein the at least one computer is further configured to actuate the breathing gas delivery unit such that the automated ventilation is carried out as a pressure support ventilation.

7. An anesthesia ventilator in accordance with claim 6 , further comprising at least one volume flow sensor for detecting a volume flow of the breathing gas, wherein the at least one computer is further configured to:

detect an attempt at spontaneous breathing by the patient on the basis of the detected volume flow; and

carry out the pressure support ventilation with the use of the desired pressure value if an attempt at spontaneous breathing is detected.

8. An anesthesia ventilator in accordance with claim 7 , wherein the at least one computer is further configured to control output of a warning signal as a function of detected attempts at spontaneous breathing and as a function of a presettable minimum ventilation rate.

9. A process for operating an anesthesia ventilator for automated ventilation of a patient, the process comprising the steps of:

feeding a breathing gas to the patient via an inspiratory port and returning the breathing gas via an expiratory port by operating a breathing gas delivery unit;

detecting an anesthetic gas concentration by means of at least one anesthetic gas sensor;

detecting a pressure of the breathing gas by means of at least one pressure sensor;

actuating the breathing gas delivery unit as a function of the detected pressure and of a preset desired pressure value by means of at least one computer;

adapting the desired pressure value as a function of the detected anesthetic gas concentration.

10. A process in accordance with claim 9 , further comprising:

determining a mean alveolar anesthetic gas concentration as well as an end-expiratory anesthetic gas concentration on the basis of the detected anesthetic gas concentration signal; and

performing the adaptation of the desired pressure value as a function of the determined mean alveolar anesthetic gas concentration as well as a function of the determined end-expiratory anesthetic gas concentration.

11. A process in accordance with claim 9 , further comprising:

detecting a volume flow of the breathing gas;

detecting a carbon dioxide concentration in the breathing gas;

adapting the desired pressure value as a function of the detected volume flow and as a function of the detected carbon dioxide concentration.

12. A computer for an anesthesia ventilator for automated ventilation of a patient, wherein the computer is configured:

to detect an anesthetic gas concentration signal, which indicates an anesthetic gas concentration in a breathing gas;

to detect a pressure signal, which indicates a pressure of the breathing gas;

to provide an actuating signal for a breathing gas delivery unit, wherein the computer determines the actuating signal as a function of the detected pressure signal and of a preset desired pressure value; and

to perform an adaptation of the desired pressure value as a function of the detected anesthetic gas concentration signal.

13. A computer in accordance with claim 12 , wherein the computer is further configured to:

determine a mean alveolar anesthetic gas concentration as well as an end-expiratory anesthetic gas concentration on the basis of the detected anesthetic gas concentration; and

perform the adaptation of the desired pressure value as a function of the determined mean alveolar anesthetic gas concentration as well as a function of the determined end-expiratory anesthetic gas concentration.

14. A computer in accordance with claim 12 , wherein the computer is further configured to:

detect a volume flow of the breathing gas;

detect a carbon dioxide concentration in the breathing gas;

adapt the desired pressure value as a function of the detected volume flow and as a function of the detected carbon dioxide concentration.

15. A process for operating an anesthesia ventilator for automated ventilation of a patient, the process comprising the steps of:

detecting an anesthetic gas concentration signal, which indicates an anesthetic gas concentration in a breathing gas;

detecting a pressure signal, which indicates a pressure of the breathing gas;

providing an actuating signal for a breathing gas delivery unit as a function of the detected pressure signal and of a preset desired pressure value; and

adapting the desired pressure value as a function of the detected anesthetic gas concentration signal.

16. A process in accordance with claim 15 , wherein the process is carried out with a computer program on at least one computer.

17. A process in accordance with claim 15 , further comprising:

determining a mean alveolar anesthetic gas concentration as well as an end-expiratory anesthetic gas concentration on the basis of the detected anesthetic gas concentration signal; and

performing the adaptation of the desired pressure value as a function of the determined mean alveolar anesthetic gas concentration as well as a function of the determined end-expiratory anesthetic gas concentration.

18. A process in accordance with claim 15 , further comprising:

detecting a volume flow of the breathing gas;

detecting a carbon dioxide concentration in the breathing gas;

adapting the desired pressure value as a function of the detected volume flow and as a function of the detected carbon dioxide concentration.