Ventilator apparatus and method for operating a ventilator in said ventilator apparatus

A ventilator apparatus, comprising a ventilator with at least one actuator, further comprising;

• at least one computing system connected to said at least one actuator;
• said at least one computing system comprising at least one memory and at least one processor;
• at least one transducer configured to provide input signals from a patient to said computing systems including at least one minute volume (Mv);
• wherein said at least one processor is configured to execute a program stored in said memory wherein said program computes a respiration frequency (f) based on a previously defined lung model (LM), depending on said minute volume (Mv), at least one functional dead space (Vd), at least one time constant (R*C) and said at least one duration ratio factor (D1, D2), which are stored in said memory, where said computed respiration frequency (f) is optimized on at least one minimum of a delivered parameter (G_tot), which is induced to the patient using said ventilator;
• an inspiratory time (Ti) and an expiratory time (Te) based on said computed respiration frequency (f) and said at least one duration ratio factor (D1, D2) are estimated in said program;
• said program computes at least one tidal volume (Vt) based on said computed respiration frequency (f) and said determined minute volume (Mv),
• and a closed loop controller connected to said computing system, configured to provide output data representing a delivered respiratory parameter of the ventilator including at least one of a respiratory pressure (Rp), a respiratory volume (Rv) and a respiratory flow (Rf), based on said computed respiration frequency (f), said determined inspiration time (Ti), said determined expiration time (Te) and said computed tidal volume (Vt).