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Controlling the operation of a respiratory gas monitor

  • US 8,230,858 B2
  • Filed: 04/01/2008
  • Issued: 07/31/2012
  • Est. Priority Date: 04/01/2008
  • Status: Active Grant
First Claim
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1. A method for controlling a respiratory gas monitor device, the respiratory gas monitor device including:

  • at least one respiratory gas analyzer,a gas sampling line flow-connected to a breathing tube suitable for feeding of respiratory gas to and from a patient,a gas pump for sucking sample(s) of respiratory gas from said breathing tube through said gas sampling line,a power supply and a processing unit, anda pressure sensor pressure-connected to said gas sampling line and electrical-signal-connected to said processing unit,wherein the method comprises;

    detecting by said processing unit a minimum value and a maximum value in the signal forwarded by said pressure sensor, wherein the minimum value in the signal represents a minimum pressure and wherein the maximum value in the signal represents a maximum pressure respectively inside said gas sampling line;

    calculating a difference between said minimum value and said maximum value;

    comparing said calculated difference with a predetermined threshold value programmed in or to said processing unit; and

    (a) if said calculated difference is below said threshold value, switching said gas pump off or keeping said gas pump non-operating by said processing unit, and(b) if said calculated difference is over said threshold value, switching said gas pump on or keeping said gas pump operating by said processing unit.

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