Continuous Blood Pressure Measurement

Abstract

We disclose a system and method for estimating values of hemodynamic parameters of a subject, by calibrating arterial pressure during one time and tracking arterial pressure at another time.

1 . A system for estimating values of hemodynamic parameters of a subject, comprising:
 a processing system comprising a processing unit and memory;   wherein the processing system is designed to receive calibration sensor data that relates to arterial pressure from a calibration sensor;   wherein the processing system is designed to receive tracking sensor data from a tracking sensor;   the processing system is designed to calculate estimated hemodynamic values of a hemodynamic parameter based upon:   one or more outputs of a DFT of tracking sensor data relating to the arterial pressure, and which tracking sensor data was obtained from the subject during a calibration time period;   at least two of MAP, PP, Ps, and Pd values from data obtained from the subject during the calibration time period;   one or more outputs of a DFT of tracking sensor data relating to the arterial pressure, which tracking sensor data was obtained during a tracking time period; and   wherein the tracking time period is different from the calibration time period;   wherein the processing system is designed to display, store or transmit the estimated hemodynamic values.   
     
     
         2 - 18 . (canceled) 
     
     
         19 . A system for estimating a ratio of SV values of a subject, comprising:
 a processing system comprising a processing unit and memory;   wherein the processing system is designed to receive tracking sensor data from a tracking   sensor data that relates to changes in arterial pressure;   the processing system is designed to estimate a ratio of SV values, based upon:   one or more outputs of a DFT of tracking sensor data relating to the arterial pressure; and   wherein the processing system is designed to store or transmit said ratio of SV values.   
     
     
         20 . The system of  19 , wherein:
 the processing system is designed to determine parameters of a combined electrical   model that corresponds to a cardiovascular model, by a calibration fitting of a function of the   combined electrical model to a function of output of a DFT of tracking sensor data for data from   a calibration time period.   
     
     
         21 . The system of  claim 19  further comprising:
 a calibration sensor; 
 a tracking sensor; and 
 a device for visually displaying or transmitting values for hemodynamic parameters. 
 
     
     
         22 . The system of  claim 19 :
 wherein the processing system is designed to determine SVV from ratio of SV values.   
     
     
         23 . A system for estimating values of hemodynamic parameters of a subject, comprising:
 a processing system comprising a processing unit and memory;   wherein the processing system is designed to determine a calibration value for at least of MAP, PP, Ps, and Pd from calibration sensor data obtained from a subject;   wherein the processing system is designed to calculate an FSUB value from a function of variables comprising: MAP; PP; and a value of a harmonic of a DFT of tracking sensor data obtained from the subject;   wherein the processing system is designed to calculate hemodynamic values of at least one hemodynamic parameter using said FSUB value and said calibration value; and   
       wherein the processing system is designed to store or transmit the calculated hemodynamic values. 
     
     
         24 . A system for estimating values of hemodynamic parameters of a subject, comprising:
 a processing system comprising a processing unit and memory;   wherein the processing system is designed to receive tracking sensor data from a tracking sensor;   wherein the processing system is designed to calculate estimated hemodynamic values of a hemodynamic parameter at two or more time instances, based upon:   one or more outputs of a DFT of tracking sensor data relating to the arterial pressure, which tracking sensor data was obtained from the subject during a first tracking time period;   one or more outputs of a DFT of tracking sensor data relating to the arterial pressure, which tracking sensor data was obtained from the subject during a second tracking time period;   wherein the first tracking time period and the second tracking time period do not overlap in time; and   wherein the processing system is designed to display, store or transmit data relating to the estimated hemodynamic values.   
     
     
         25 . (canceled) 
     
     
         26 . A method for estimating a ratio of SV values of a subject, using a system comprising
 a processing system comprising a processing unit and memory, comprising:   receiving in the processing system tracking sensor data from a tracking sensor data that relates to changes in arterial pressure;   the processing system estimating a ratio of SV values, based upon one or more outputs of a DFT of tracking sensor data relating to the arterial pressure; and   the processing system storing or transmitting said ratio of SV values.   
     
     
         27 - 28 . (canceled)