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Adaptive controller for automatic ventilators

  • US 5,388,575 A
  • Filed: 09/25/1992
  • Issued: 02/14/1995
  • Est. Priority Date: 09/25/1992
  • Status: Expired due to Term
First Claim
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1. A pulsed positive pressure ventilation assist respirator system comprising:

  • a ventilator means for providing a selected level of positive pressure respirable gas, said ventilator means further having register means for providing a predetermined level of patient parameters to said ventilator, said patient parameters consisting in inspiration time (Tinsp), positive end expiratory pressure (PEEP) and minimum required fraction inspired oxygen (FiO2);

    pulse oximeter means for optically determining the hemoglobin saturation (HSAT) of the patient'"'"'s blood;

    interpolation means for linearly interpolating the HSAT value provided by said pulse oximeter means for calculating the partial pressure of arterial oxygen (PaO2) of a patient;

    a control mechanism comprising calculation means for deriving a relationship between said patient parameters in said register means and HSAT value provided by said pulse oximeter means;

    said control mechanism further comprising adaptive means for providing said register means with updated adjusting values for said patient parameters for maintaining a predetermined PaO2.

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