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Apparatus for compensating for flow and pressure variances in pneumatic circuits

  • US 5,794,614 A
  • Filed: 06/07/1996
  • Issued: 08/18/1998
  • Est. Priority Date: 05/19/1989
  • Status: Expired due to Fees
First Claim
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1. An apparatus for compensating variances in a circuit used for applying airway pressure to a patient'"'"'s airway, comprising:

  • a source of breathable gas provided under a controllable pressure;

    a pneumatic circuit connection supplying the breathable gas from the source to the patient'"'"'s airway, wherein the pneumatic circuit connection exhibits a connection variance;

    a sensor disposed proximal to the pneumatic circuit connection for ascertaining a circuit characteristic and producing a signal value representative thereof;

    a memory storing a look-up table containing empirical values corresponding to known variances of pneumatic circuit connections;

    a signal processor receiving and comparing the signal value with the empirical values to ascertain a deviation value; and

    a controller connected to the signal processor and the source of breathable gas, wherein the controller adjusts the source in accordance with the deviation value.

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