Abstract: A respiration system and method for minimizing the oxygen concentration of inspiration gas supplied to a patient while maintaining a desired arterial oxygen partial pressure in the patient comprising a regulator for changing the oxygen concentration of inspiration gas supplied to a respirator according to a desired nominal value therefor and a sensed value therefor taken from the patient, a control device for adjusting parameters of the breathing gas in the respirator supplied to the patient while maintaining the desired arterial oxygen partial pressure, and a minimizer connected to the control device for changing a direction of the adjustment when the oxygen concentration in the inspiration gas cannot be maintained within a range between a first sensed instantaneous value for the oxygen concentration in the inspiration gas and a lower limit set for that value.

Abstract: A testing device for the partial pressure testing of gases in body fluids comprises a test electrode having a platinum wire extending through a glass tubule arranged in a synthetic tube having a tip with a cellophane layer thereon. The electrode and a counter-electrode are connected through a switch to a pulse generator for generating a control pulse and for also generating a bias voltage pulse. A transverse storage unit is also connected to the switch through a test amplifier. A logic element is connected to the transverse storage for establishing a pulse width, and it is connected through a pulse delay unit and delay circuit. The storage unit is also connected through an amplifier and comparator to a control, warning or indication device. A bias voltage is fed in a pulse to the test electrode, and a test pulse resulting from the current flow of the test electrode is converted to a transfer pulse of a width smaller than that of the test pulse, which is proportional to the amplitude section of the test pulse.