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US 6,050,951 AGranted
NIBP trigger in response to detected heart rate variability
AssigneeCritikon, Inc.
InventorsBruce Friedman, Lawrence T. Hersh, Richard Medero
Life of this patent
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AssigneeCritikon, Inc.
InventorsBruce Friedman, Lawrence T. Hersh, Richard Medero
Estimating the term…
An automated sphygmomanometer which triggers a blood pressure determination upon detection of a significant change in the patient's heart rate variability (HRV). The HRV can be measured directly from the NIBP signal or, when a multiparameter monitor is used, the HRV can be measured from the ECG signal or the NIBP signal. HRV is continuously monitored and the baseline HRV is correlated with baseline blood pressure values. Changes in HRV are displayed continuously on a display so that the clinician can determine whether to initiate an NIBP measurement or, on the other hand, the NIBP measurement can be triggered automatically in response to a change in HRV without any intervention by the clinician. Alternatively, the patient monitor can "learn" the correlation between HRV and blood pressure changes and only alert the clinician when a significant change in HRV has taken place. The technique of the invention allows the clinician to monitor NIBP at less frequent intervals without the concern of missing physiologically significant changes in blood pressure and without the requirement of "check inflates" in a guard mode.
An automated sphygmomanometer apparatus, comprising:
An automatic oscillometric blood pressure monitor comprising:
A method of monitoring a patient's blood pressure, comprising the steps of:
In an automatic oscillometric blood pressure monitor comprising a pressurized cuff, means for inflating and deflating said cuff, means for measuring arterial pressure oscillation complexes through measurement of time varying pressures within said cuff, and means for determining a patient's blood pressure at predetermined intervals by instructing said inflating and deflating means to inflate said cuff about an artery of the patient until said cuff is at a pressure level above the patient's estimated systolic pressure and to deflate said cuff by predetermined pressure decrements, by searching for arterial pressure oscillation complexes at each pressure level, and by determining, from said arterial pressure oscillation complexes an oscillometric envelope of the patient, a method of monitoring a patient's blood pressure comprising the steps of:
Dependencies are inferred from the claim text.