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Medical ventilator system

  • US 4,527,557 A
  • Filed: 11/01/1984
  • Issued: 07/09/1985
  • Est. Priority Date: 11/01/1984
  • Status: Expired due to Term
First Claim
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1. A ventilator system for providing artificial ventilation to a patient, comprising:

  • means for providing a pressure regulated source of respiratory gas;

    flow control means for controlling the rate of flow of said respiratory gas in accordance with a predetermined flow rate-versus-time function, the flow control means receiving the gas from said source and being in fluid communication with the patient for transmitting the gas to the patient;

    exhalation valve means in fluid communication with the patient and with the flow control means for providing an outlet to the ambient for the proximal gases of the patient, said proximal gases including respiratory gas made available for breathing of the patient and gases exhaled by the patient, the exhalation valve means receiving an input pressure signal and being adapted for closing said outlet to the ambient when the input pressure signal exceeds the pressure of the proximal gases;

    pressure control means operatively connected with the exhalation valve means for providing said input pressure signal in accordance with a predetermined pressure-versus-time function, the pressure control means including venturi jet means receiving gas under substantially constant pressure, an outlet port for a stream of gas flowing in the venturi jet means to the ambient, a static port in fluid communication with said stream of gas to provide the input pressure signal, and means for regulating the flow rate of said stream of gas whereby the input pressure signal is regulated, the means for regulating including motor actuated means for interfering with the flow of the stream of gas in accordance with electric input signals received by the motor actuated means;

    pressure transducer means for sensing the instantaneous pressure of the proximal gases, and for generating electric signals indicative of said instantaneous pressure of the proximal gases, andcomputer means for receiving the electric signals from the pressure transducer means, for providing the predetermined pressure-versus-time function, for comparing the value required by said function to the instantaneous pressure of the proximal gases sensed by the pressure transducer means, and for generating and sending a corrective electric signal to the motor actuated means to regulate the flow of the stream of gas to adjust the input pressure signal to a value required by the predetermined pressure-versus-time function.

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