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Blood pressure and pulse oximeter monitor

  • US 5,309,908 A
  • Filed: 05/14/1993
  • Issued: 05/10/1994
  • Est. Priority Date: 12/13/1991
  • Status: Expired due to Fees
First Claim
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1. An apparatus for producing an audible alarm in a patient monitoring system which includes a blood pressure module having a cuff and a pulse oximeter locatable on the same limb of the patient, said apparatus comprising:

  • first plethysmograph means for measuring oscillations of the pressure in said cuff on said patient and producing an output having a logic level value equal to zero when said measurements are in the range between a first minimum level Pmin and a threshold level Pthr less than the patient'"'"'s systolic pressure and producing an output having a logic level value equal to one when said measurements are outside of said range;

    second plethysmograph means connected to said pulse oximeter for measuring the pulse and oxygen saturation level (SpO2) of said patient and producing an output indicative thereof; and

    ,gate means having inputs connected to the outputs of said first and second plethysmograph means respectively and an output producing an audible alarm,wherein when said first plethysmograph means logic level is equal to zero, the output from said gate means does not produce said audible alarm.

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