A ventilator device and system comprising a rotating compressor, preferably a drag compressor, which, at the beginning of each inspiratory ventilation phase, is accelerated to a sufficient speed to deliver the desired inspiratory gas flow, and is subsequently stopped or decelerated to a basal flow level to permit the expiratory ventilation phase to occur. The ventilator device is small and light weight enough to be utilized in portable applications. The ventilator device is power efficient enough to operate for extended periods of time on internal or external batteries. Also provided is an oxygen blending apparatus which utilizes solenoid valves having specific orifice sizes for blending desired amounts of oxygen into the inspiratory gas flow. Also provided is an exhalation valve having an exhalation flow transducer which incorporates a radio frequency data base to provide an attendant controller with specific calibration information for the exhalation flow transducer.

Portable drag compressor powered mechanical ventilator

An apparatus for supplying a mixture of oxygen and an anesthetic gas at a predetermined flow rate and mixture ratio. The flow rate and mixture ratio are controlled by means of electrically operated throttle valves, responsive to output signals from an electronic control system, generated in accordance with data stored in the control system and with input signals applied to the computer from means for sensing the flow rates of the oxygen and anesthetic gas. Desired flow rate and mixture ratio data may be input by using a numeric keyboard, and are digitally displayed.

Anesthetic gas control apparatus

A respiratory ventilator and methodology thereof for automatically calibrating respiration gas flow delivery. The ventilator includes a gas flow calibration member having a reader component for recording inspiratory and exhalation gas volume with exhalation time, and for measuring a plurality of incremental exhalation gas flow values in a plurality of incremental time periods during a single exhalation. The gas flow calibration member includes a composite calculator component for determining an average of consecutive composite flow values, and a scanner calculator component for scanning in reverse order the plurality of consecutive composite flow values and calculating a new flow calibration value where a preselected number of consecutive composite flow values fall within a pre-selected flow rate. Thereafter, the gas delivery member is calibrated in accord with the determined new flow calibration value.

Respiratory ventilator with automatic flow calibration

A mixing device for respiratory, therapeutic, or anesthetic uses provides two of three gases to a mixed gas outlet. A gas selecting means fluidly connected with a first and second gas supplies selectively provides fluid passage of only one of the first or second gases to the outlet. A gas bypass selectively bypasses two of the three gases to the gas outlet. A locking device activated by the selecting means prevents a predetermined one of the first or second gases from being bypassed to the gas outlet. A first and second pressure balancing regulator equalizing the pressures of the selected gas and the third gas before passing those gases to a controllable mixing device which meters the gases into a mixing chamber, after which the gases are passed to the gas outlet. Advantageously, a gas selector knob is positioned coaxially with a mixing valve such that rotation of the selector valve causes correctly calibrated scales to become visible to reflect the mixture of the selected gases as they are mixed.

Method and apparatus for selectively mixing gases

An anesthetic metering device is provided with a temperature-stabilized anesthetic vapor source, from which anesthetic vapor 14 is metered into a carrier gas stream via a delivery line 8 with a metering valve 11 that can be controlled by a control unit 6. The arrangement is provided so that uncontrolled evaporation of anesthetic is prevented. To accomplish this task, the anesthetic vapor source is designed as a vaporizer chamber 2 filled with liquid anesthetic 3, and a gas delivery element 9 generating the metering pressure PI is present in front of the metering valve 11.

Anesthetic metering device

Patient safeguarding anesthesia apparatus

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Patient safeguarding anesthesia apparatus