SYSTEM FOR MEASURING VITAL SIGNS USING AN OPTICAL MODULE FEATURING A GREEN LIGHT SOURCE

• US 20070185393A1
• Filed: 02/03/2006
• Published: 08/09/2007
• Est. Priority Date: 02/03/2006
• Status: Abandoned Application

• Current Assignee: Triage Wireless, Inc.
• Original Assignee: Triage Wireless, Inc.
• Inventors: Zhou, Zhou, Thompson, Michael, Banet, Matthew
• Application Number:
  US11/307,375
• Publication Number:
  US 20070185393A1
• Time in Patent Office: Days
• US Class Current: 600/323
• 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 5/02416 using photoplethysmograph signals, e.g. generated by infrared radiation A61B5/14552 takes precedence
• CPC Class Codes: A61B 5/0245 by using sensing means generating electric signals, i.e. ECG signals
• CPC Class Codes: A61B 5/14552 Details of sensors specially adapted therefor
• CPC Class Codes: A61B 5/318 Heart-related electrical modalities, e.g. electrocardiography [ECG]

Abstract

The invention provides a system for measuring vital signs from a patient that includes: 1) a first sensor including a first electrode that measures a first electrical signal from the patient; 2) a second sensor including a second electrode that measures a second electrical signal from the patient; and 3) a third sensor including an optical system with a light source configured to emit green radiation and a photodetector configured to measure the green radiation emitted from the light source, after it irradiates the patient, to generate an optical signal; and 4) a controller that receives and processes the first and second optical and electrical signals and the electrical waveform to determine the patient'"'"'s vital signs.

Claims

1. A system for measuring vital signs from a patient, comprising:

a first sensor comprising a first electrode that measures a first electrical signal from the patient;

a second sensor comprising a second electrode that measures a second electrical signal from the patient;

a third sensor comprising an optical system comprising a light source configured to emit green radiation between 510-590 nm and a photodetector configured to measure green radiation emitted from the light source after it irradiates the patient to generate an optical signal; and

a controller comprising a system configured to;

i) receive and process the first and second electrical signals to generate an electrical waveform;

ii) receive and process the optical signal to generate an optical waveform; and

iii) calculate a time difference between a first feature on the electrical waveform and a second feature on the optical waveform to determine a blood pressure for the patient.

2. The system of claim 1, wherein the light source is an LED.

3. The system of claim 1, wherein the light source is configured to emit green radiation between 510 and 590 nm.

4. The system of claim 1, wherein the third sensor is configured to operate in a reflection-mode geometry.

5. The system of claim 1, wherein the third sensor further comprises a substrate, and the light source and photodetector are disposed on a same side of the substrate.

6. The system of claim 5, wherein the photodetector is aligned to detect radiation first emitted from the light source and then reflected from the patient'"'"'s tissue to generate the optical waveform.

7. The system of claim 1, wherein the third sensor is comprised by a patch configured to be worn on the patient'"'"'s body.

8. The system of claim 7, wherein the patch further comprises an adhesive component configured to adhere to the patient'"'"'s body.

9. The system of claim 1, wherein the third sensor further comprises a third electrode.

10. The system of claim 9, wherein the first sensor is a first adhesive patch comprising the first electrode, and the second sensor in a second adhesive patch comprising the second electrode.

11. The system of claim 1, wherein the first, second, and third sensors are comprised by a hand-held unit.

12. The system of claim 11, wherein the hand-held unit further comprises first and second sensors configured to measure electrical signals from at least one of the patient'"'"'s fingers.

13. The system of claim 11, wherein the hand-held unit further comprises a third sensor configured to measure an optical signal from at least one of the patient'"'"'s fingers.

14. The system of claim 1, wherein the controller further comprises a first amplifier system configured to process the first and second electrical signals to generate an electrical waveform.

15. The system of claim 1, wherein the controller further comprises a second amplifier system configured to process the optical signals to generate an optical waveform.

16. The system of claim 1, wherein the controller further comprises an algorithm that determines blood pressure by processing:

1) a first time-dependent feature of the optical waveform;

     2) a second time-dependent feature of the electrical waveform; and

     3) a set of calibration parameters.

17. The system of claim 1, wherein the third sensor further comprises a first light source that emits green radiation that generates a first optical waveform, and a second light source that emits infrared radiation that generates a second optical waveform.

18. The system of claim 17, wherein the controller further comprises an algorithm that processes the first and second optical waveforms to generate a pulse oximetry value.

19. The system of claim 1, wherein the controller further comprises an algorithm that processes the optical waveform to generate a heart rate value.

20. The system of claim 1, wherein the controller further comprises an algorithm that processes the first and second electrical signals to generate an ECG waveform.

21. The system of claim 20, wherein the controller further processes the ECG waveform to calculate a heart rate.

22. A system for measuring vital signs from a patient, comprising:

a first electrode comprised by a first adhesive patch and configured to measure a first electrical signal from the patient;

a second electrode comprised by a second adhesive patch and configured to measure a second electrical signal from the patient;

a third sensor comprised by an adhesive patch and comprising an optical system comprising a light source configured to emit green radiation between 510-590 nm and a photodetector configured to measure green radiation reflected off the patient to generate an optical signal; and

a controller comprising a system configured to;

i) receive and process the first and second electrical signals to generate an electrical waveform;

ii) receive and process the optical signal to generate an optical waveform; and

iii) calculate a time difference between a first feature on the electrical waveform and a second feature on the optical waveform to determine a blood pressure for the patient.

23. A hand-held system for measuring vital signs from a patient, comprising:

a housing comprising;

a first electrode configured to measure a first electrical signal from the patient;

a second electrode configured to measure a second electrical signal from the patient;

a third sensor comprising an optical system comprising a light source configured to emit green radiation between 510-590 nm and a photodetector configured to measure green radiation reflected off the patient to generate an optical signal; and

a controller comprising a system configured to;

i) receive and process the first and second electrical signals to generate an electrical waveform;

ii) receive and process the optical signal to generate an optical waveform; and

iii) calculate a time difference between a first feature on the electrical waveform and a second feature on the optical waveform to determine a blood pressure for the patient.