Method and apparatus for controlling an artificial respirator

  • US 4,986,268 A
  • Filed: 08/18/1988
  • Issued: 01/22/1991
  • Est. Priority Date: 04/06/1988
  • Status: Expired due to Term
First Claim
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1. In a respirator for varying tidal volume and frequency of breaths of a patient, an apparatus for automatically controlling the respirator comprising:

  • first means for processing data representing at least air viscosity factor in lungs of the patient, barometric pressure, lung elastance factor of the patient and measured levels of carbon dioxide and oxygen levels of the patient, and for providing, based upon said data, digital output data indicative of required ventilation and optimum frequency for a next breath of the patient;

    second means operatively coupled to the first means for converting the digital output data to analog data; and

    ,third means operatively coupled to the second means and to the respirator for converting the analog data to timing and control signals and supplying the timing and control signals to the respirator, the timing and control signals automatically and variably controlling the tidal volume and frequency of inhaled gas provided to the patient by the respirator based upon actual ventilation and breathing frequency requirements of the patient as determined by the first means.

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