Patent ID: 8556821

Claim:
A method of computing an oscillometric envelope for use in determining the blood, pressure of a patient, the method comprising: receiving, with a processing unit, an oscillometric signal from a blood pressure cuff connected to a patient; acquiring a heart rate from the patient with a heart rate monitor separate from the blood pressure cuff, the heart rate monitor being a different modality from the blood pressure cuff; computing the fundamental frequency of the heart rate with a fundamental frequency computer operating on the processing unit; computing at least one harmonic frequency of the heart rate with a harmonic frequency computer operating on the processing unit; converting the oscillometric signal to a frequency domain oscillometric signal with a time to frequency converter; removing acquisition artifacts from the received oscillometric signal by: filtering, with the processing unit, the frequency domain oscillometric signal using a band pass filter centered on the fundamental frequency of the heart rate acquired from the heart rate monitor of a different modality to produce a first filtered frequency domain signal; filtering, with the processing unit, the frequency domain oscillometric signal using a band pass filter centered on the at least one harmonic frequency of the heart rate acquired from the heart rate monitor of a different modality to produce a second filtered frequency domain signal; and reconstructing the oscillometric signal with an oscillometric waveform reconstructor operating on the processing unit from the first and second filtered frequency domain signals to produce a reconstructed oscillometric signal; computing at least one oscillometric envelope data point from the reconstructed oscillometric signal with an oscillation size calculator operating on the processing unit; computing an oscillometric envelope from the computed at least one oscillometric data point; and determining at least one of mean arterial pressure, systolic pressure, and diastolic pressure from the oscillometric envelope.