BLOOD PRESSURE MONITOR

• US 20110288421A1
• Filed: 08/02/2011
• Published: 11/24/2011
• Est. Priority Date: 09/08/2006
• Status: Abandoned Application

• Current Assignee: Sotera Wireless Incorporated
• Original Assignee: Sotera Wireless Incorporated
• Inventors: ZHOU, Zhou, BANET, Matthew John, THOMPSON, Michael James
• Application Number:
  US13/196,326
• Publication Number:
  US 20110288421A1
• Time in Patent Office: Days
• US Class Current: 600/485
• CPC Class Codes: A61B 5/0059 using light, e.g. diagnosis by transillumination, diascopy, fluorescence A61B5/0093, A61B5/1455, A61B5/02416 and A61B5/0261 take precedence
• CPC Class Codes: A61B 5/02028 Determining haemodynamic parameters not otherwise provided for, e.g. cardiac contractility or left ventricular ejection fraction
• CPC Class Codes: A61B 5/021 Measuring pressure in heart or blood vessels A61B5/0205 takes precedence
• CPC Class Codes: A61B 5/02125 of pulse wave propagation time
• CPC Class Codes: A61B 5/026 Measuring blood flow A61B3/1233, A61B3/1241 take precedence
• CPC Class Codes: A61B 5/318 Heart-related electrical modalities, e.g. electrocardiography [ECG]
• CPC Class Codes: A61B 5/6833 Adhesive patches
• CPC Class Codes: A61B 5/7239 using differentiation including higher order derivatives
• CPC Class Codes: A61B 7/04 Electric stethoscopes microphones, acoustic transducers therefor H04R

Abstract

The invention provides a method for measuring a blood pressure value of a user featuring the following steps: 1) generating optical, electrical, and acoustic waveforms with, respectively, optical, electrical, and acoustic sensors attached to a single substrate that contacts a user; 2) determining at least one parameter by analyzing the optical and acoustic waveforms; and 3) processing the parameter to determine the blood pressure value for the user.

Claims

1. A system for measuring a blood pressure value of a user, the system comprising:

a sensor system configured to be worn on the user'"'"'s body, said sensor system comprising;

an optical sensor including a light source and a photodetector configured to generate an optical waveform from a signal detected after the light source irradiates a portion of the user'"'"'s body;

an ECG sensor including at least two electrodes and an ECG circuit and configured to generate an ECG waveform from a first electrical signal detected by a first electrode and a second electrical signal detected by a second electrode; and

a third sensor that is neither an optical sensor nor an ECG sensor and configured to generate a third waveform from a signal that it detects from the user'"'"'s body; and

a processor in electrical contact with the optical, ECG, and third sensors, and configured to receive the optical, ECG, and third waveforms, the processor further configured to analyze time-dependent properties of the third waveform determine at least one parameter and to process the at least one parameter and a time delay between at least two of the waveforms to determine a blood pressure value.

2. The system of claim 1, wherein the third sensor is one of an acoustic sensor and an impedance sensor.

3. The system of claim 2, wherein the third waveform is one of an acoustic waveform and an impedance waveform.

4. The system of claim 3, wherein the third waveform is one of a PCG waveform and an ICG waveform.

5. The system of claim 3, wherein the at least one parameter is LVET.

6. A system for measuring a blood pressure value of a user, the system comprising:

a sensor system configured to be worn on the user'"'"'s body, said sensor system comprising;

an optical sensor including a light source and a photodetector configured to generate an optical waveform from a signal detected after the light source irradiates a portion of the user'"'"'s body;

an ECG sensor including at least two electrodes and an ECG circuit and configured to generate an ECG waveform from a first electrical signal detected by a first electrode and a second electrical signal detected by a second electrode; and

a third sensor that is neither an optical sensor nor an ECG sensor and configured to generate a third waveform from a signal that it detects from the user'"'"'s body; and

a processor in electrical contact with the optical, ECG, and third sensors, and configured to receive the optical, ECG, and third waveforms, the processor further configured to analyze the third waveform to determine LVET and to process LVET and a time delay between at least two of the waveforms to determine a blood pressure value.

7. The system of claim 6, wherein the third sensor is one of an acoustic sensor and an impedance sensor.

8. The system of claim 7, wherein the third waveform is one of an acoustic waveform and an impedance waveform.

9. The system of claim 8, wherein the third waveform is one of a PCG waveform and an ICG waveform.

10. A system for measuring a blood pressure value of a user, the system comprising:

a sensor system configured to be worn on the user'"'"'s body, said sensor system comprising;

an optical sensor including a light source and a photodetector configured to generate an optical waveform from a signal detected after the light source irradiates a portion of the user'"'"'s body;

an ECG sensor including at least two electrodes and an ECG circuit and configured to generate an ECG waveform from a first electrical signal detected by a first electrode and a second electrical signal detected by a second electrode; and

a third sensor that is neither an optical sensor nor an ECG sensor and configured to generate a third waveform from a signal that it detects from the user'"'"'s body; and

a processor in electrical contact with the optical, ECG, and third sensors, and configured to receive the optical, ECG, and third waveforms, the processor further configured to analyze at least one of the waveforms to determine a mathematical derivative and to analyze the mathematical derivative and a time delay between at least two of the waveforms to determine a blood pressure value.

11. The system of claim 10, wherein the processor is further configured to determine a mathematical derivative of the optical waveform.

12. A system for measuring a blood pressure value of a user, the system comprising:

a sensor system configured to be worn on the user'"'"'s body, said sensor system comprising;

an optical sensor including a light source and a photodetector configured to generate an optical waveform from a signal detected after the light source irradiates a portion of the user'"'"'s body;

an ECG sensor including at least two electrodes and an ECG circuit and configured to generate an ECG waveform from a first electrical signal detected by a first electrode and a second electrical signal detected by a second electrode; and

a third sensor that is neither an optical sensor nor an ECG sensor and configured to generate a third waveform from a signal that it detects from the user'"'"'s body; and

a processor in electrical contact with the optical, ECG, and third sensors, and configured to receive the optical, ECG, and third waveforms, the processor further configured to analyze the third waveform to determine at least one parameter and to process the at least one parameter, a pulse transit time, and a vascular transit time to determine a blood pressure value.

13. The system of claim 12, wherein the third sensor is one of an acoustic sensor and an impedance sensor.

14. The system of claim 13, wherein the third waveform is one of an acoustic waveform and an impedance waveform.

15. The system of claim 14, wherein the third waveform is one of a PCG waveform and an ICG waveform.

16. The system of claim 12, wherein the at least one parameter is LVET.

17. A system for measuring a blood pressure value of a user, the system comprising:

a sensor system configured to be worn on the user'"'"'s body, said sensor system comprising;

an optical sensor including a light source and a photodetector configured to generate an optical waveform from a signal detected after the light source irradiates a portion of the user'"'"'s body;

an ECG sensor including at least two electrodes and an ECG circuit and configured to generate an ECG waveform from a first electrical signal detected by a first electrode and a second electrical signal detected by a second electrode; and

a third sensor that is neither an optical sensor nor an ECG sensor and configured to generate a third waveform from a signal that it detects from the user'"'"'s body; and

,

a processor in electrical contact with the optical, ECG, and third sensors, and configured to receive the optical, ECG, and third waveforms, the processor further configured to calculate a linear combination of a pulse transit time determined from at least two waveforms, a vascular transit time determined from at least two waveforms, and a value of LVET determined from the third waveform to determine a blood pressure value.

18. The system of claim 17, wherein the third sensor is one of an acoustic sensor and an impedance sensor.

19. The system of claim 18, wherein the third waveform is one of an acoustic waveform and an impedance waveform.

20. The system of claim 19, wherein the third waveform is one of a PCG waveform and an ICG waveform.