Non-invasive blood pressure measurement system

Abstract

A system for non-invasively determining an indication of an individual's blood pressure is described. In certain embodiments, the system calculates pulse wave transit time using two acoustic sensors. The system can include a first acoustic sensor configured to monitor heart sounds of the patient corresponding to ventricular systole and diastole and a second acoustic sensor configured to monitor arterial pulse sounds at an arterial location remote from the heart. The system can advantageously calculate a arterial pulse wave transit time (PWTT) that does not include the pre-ejection period time delay. In certain embodiments, the system further includes a processor that calculates the arterial PWTT obtained from the acoustic sensors. The system can use this arterial PWTT to determine whether to trigger an occlusive cuff measurement.

1 - 33 . (canceled) 
     
     
         34 . A method of reducing blood pressure cuff measurements, the method comprising:
 estimating a blood pressure measurement from a plurality of non-invasive sensors;   determining that the estimated blood pressure change satisfies a condition; and   triggering a blood pressure cuff measurement based on the determination.   
     
     
         35 . The method of  claim 34 , wherein the plurality of non-invasive sensors comprise a pulse oximeter and an electrocardiogram (ECG) sensors. 
     
     
         36 . The method of  claim 35 , wherein the plurality of non-invasive sensors further comprise an acoustic sensor. 
     
     
         37 . The method of  claim 34 , wherein the condition comprises exceeding a threshold blood pressure change value. 
     
     
         38 . The method of  claim 34 , wherein the condition is based on patient-specific factors. 
     
     
         39 . The method of  claim 34 , wherein the determination is further based on heart rate measurements. 
     
     
         40 . The method of  claim 34 , further comprising using an adaptive filter for the estimations of the blood pressure measurement. 
     
     
         41 . A system of reducing blood pressure cuff measurements, the system comprising one or more hardware processors configured to:
 estimate a blood pressure measurement from a plurality of non-invasive sensors;   determine that the estimated blood pressure change satisfies a condition; and   trigger a blood pressure cuff measurement based on the determination.   
     
     
         42 . The system of  claim 41 , wherein the plurality of non-invasive sensors comprise a pulse oximeter and an electrocardiogram (ECG) sensors. 
     
     
         43 . The system of  claim 42 , wherein the plurality of non-invasive sensors further comprise an acoustic sensor. 
     
     
         44 . The system of  claim 41 , wherein the condition comprises exceeding a threshold blood pressure change value. 
     
     
         45 . The system of  claim 41 , wherein the condition is based on patient-specific factors. 
     
     
         46 . The system of  claim 34 , wherein the determination is further based on heart rate measurements. 
     
     
         47 . The system of  claim 34 , further comprising using an adaptive filter for the estimations of the blood pressure measurement.