초록 ▼

The breathing cycle of a patient is controlled to achieve proper ventilation and at the same time minimize the work of distension of the lungs. Oxygen enriched air is delivered to the patient during the inspiration period such that the pressure waveform is a ramp function having initial and final va

The breathing cycle of a patient is controlled to achieve proper ventilation and at the same time minimize the work of distension of the lungs. Oxygen enriched air is delivered to the patient during the inspiration period such that the pressure waveform is a ramp function having initial and final values which are dependent on the resistance, compliance and alveolar volume of the lungs. The apparatus includes a source of oxygen enriched air at a regulated pressure and a pneumatically controlled pressure reducing valve for reducing the pressure of the oxygen enriched air for delivery to the patient. The valve is controlled by a transducer which converts an electrical control signal into a pneumatic control signal. The electrical control signal which is generated by an electronic control circuit, is a function of the parameters of the patient\s lungs.

대표청구항 ▼

A method of controlling the breathing cycle of a patient comprising: determining the total resistance R of the patient\s lungs; determining the total compliance C of the patient\s lungs; determining the alveolar tidal volume V°AT of the patient\s lungs; delivering oxygen enriched air to the patient

A method of controlling the breathing cycle of a patient comprising: determining the total resistance R of the patient\s lungs; determining the total compliance C of the patient\s lungs; determining the alveolar tidal volume V°AT of the patient\s lungs; delivering oxygen enriched air to the patient for an inspiration period tAT/tAT/t