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System for monitoring therapy during calibration

  • US 5,752,504 A
  • Filed: 12/13/1996
  • Issued: 05/19/1998
  • Est. Priority Date: 12/13/1996
  • Status: Expired due to Term
First Claim
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1. A system for providing nitric oxide therapy to a patient, said system having a source of NO containing gas, a source of O2 containing gas, at least one gas concentration monitor and an electrically operated valve for controlling the amount of NO containing gas administered to the patient, a therapy CPU providing an electrical signal for controlling the position of said electrically operated valve and for continuously monitoring the value of the electrical signal provided to said electrically operated valve, the improvement comprising a calibration system to effect the calibration of said at least one gas monitor, means to activate said calibration system whereby said at least one gas concentration monitor is inactivated from monitoring a gas, said means to activate said calibration system providing a signal to said therapy CPU to cause said CPU to detect the value of the electrical signal then being provided to said electrically operated valve by said therapy CPU, means to determine limits of change of said electrical signal with respect to said detected electrical signal value and means to continuously monitor said electrical signal to said electrically operated valve and to provide an alarm signal wherever said monitored electrical signal exceeds said determined limit.

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