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Target drive ventilation gain controller and method

  • US 6,962,155 B1
  • Filed: 07/30/1999
  • Issued: 11/08/2005
  • Est. Priority Date: 07/30/1999
  • Status: Expired due to Fees
First Claim
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1. A lung ventilator control system for maintaining at a sustainable target level a respiratory drive of a patient assisted by a lung ventilator during inspiration, comprising:

  • a detector of the electrical activity of a muscle of the patient indicative of a respiratory drive of said patient, said detector producing a respiratory drive signal in response to the detected electrical activity;

    a target drive signal supply which, in operation, produces a target drive signal of given amplitude, said target drive signal being representative of the sustainable respiratory drive target level;

    a signal comparator responsive to the respiratory drive signal and the target drive signal to produce a comparison signal indicative of whether the respiratory drive signal has an amplitude lower or higher than the amplitude of the target drive signal;

    a gain supply responsive to the comparison signal from the signal comparator to supply a gain, said gain supply having a gain-increasing unit which increases the gain when the comparison signal indicates that the amplitude of the respiratory drive signal is higher than the amplitude of the target drive signal, and a gain-decreasing unit which decreases the gain when the comparison signal indicates that the amplitude of the respiratory drive signal is lower than the amplitude of the target drive signal; and

    a gain multiplier responsive to the gain from the gain supply and the respiratory drive signal to multiply said respiratory drive signal by said gain and therefore produce a ventilator control signal for application to and control of the lung ventilator.

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