IP Library › Granted Patent US 12,232,888
Granted Patent B2
US 12,232,888 · App. 18/048,365 · Granted Feb 25, 2025

Multi-site noninvasive measurement of a physiological parameter

Inventors: Vikrant Sharma (Santa Ana, CA); Philip Perea (Aliso Viejo, CA); Prashanth Iyengar (Irvine, CA)
Assignee: Masimo Corporation
A61B5/6814A61B5/0024A61B5/0205A61B5/742A61B5/0075A61B5/02416A61B5/14532A61B5/1455A61B5/6826A61B5/6829A61B2562/04
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Quick Facts
Patent No.
US 12,232,888
App. No.
18/048,365
Filed
Oct 20, 2022
Granted
Feb 25, 2025
Kind
B2
Art Unit
3791
USPC
600/323
Abstract

A patient monitor can noninvasively measure a physiological parameter using sensor data from different measurement sites on a patient. The patient monitor can combine all sensor data from different measurement sites into a raw or minimally processed data form to generate a single, robust measurement of the physiological parameter. An optical sensor of a patient monitor can include multiple photodetectors each configured to generate a signal when detecting light attenuated by the patient's tissue. A measurement of a physiological parameter can be determined based on at least in part on the multiple signals from the multiple photodetectors.

Claims (30)

1. A method of calculating a measurement of a target physiological parameter, the method comprising:

using a plurality of light emitters of a first sensor, emitting light of at least two wavelengths into tissues of a first measurement site of a patient;

using one or more electronic light detectors of the first sensor, detecting the light attenuated by the tissues of the first measurement site and outputting a first signal based on the light detected at the first measurement site;

using a plurality of light emitters of a second sensor, emitting light of at least two wavelengths into tissues of a second measurement site of a patient, the second measurement site different from the first measurement site;

using one or more electronic light detectors of the second sensor, detecting the light attenuated by the tissues of the second measurement site and outputting a second signal based on the light detected at the second measurement site; and

using one or more signal processors that are in electrical communication with the first and second sensors;

combining the first signal and the second signal into combined sensor data,

processing the combined sensor data to obtain and analyze combinations of features of the first signal and features of the second signal, the combinations comprising location information or body tissue information of the first measurement site and the second measurement site, and

determining the measurement of the target physiological parameter based on analysis of the combinations of features.

2. The method of claim 1 , wherein the first and second measurement sites comprise different types of body tissues.

3. The method of claim 1 , wherein the first measurement site is on the patient's head.

4. The method of claim 1 , wherein the first measurement site is the patient's nose.

5. The method of claim 1 , wherein the second measurement site is a peripheral site of the patient.

6. The method of claim 5 , wherein the second measurement site is the patient's finger.

7. The method of claim 1 , wherein the target physiological parameter comprises oxygen saturation, pulse rate, perfusion index, pleth variability index, methemoglobin, carboxyhemoglobin, total hemoglobin, and/or glucose.

8. The method of claim 1 , wherein the combinations of features further comprise non-normalized features, data from bulk absorption, or peripheral absorption signals.

9. The method of claim 1 , wherein the combinations of features further comprise linear feature and/or high-ordered features.

10. A noninvasive physiological monitor, the monitor comprising:

a first optical sensor having a plurality of light emitters and one or more photodetectors, the plurality of light emitters of the first optical sensor configured to emit optical radiation onto tissue of a first measurement site of a patient, the one or more photodetectors of the first optical sensor configured to detect the optical radiation attenuated by the tissue of the first measurement site and output a first signal responsive to the light attenuation by the tissue of the first measurement site;

a second optical sensor having a plurality of light emitters and one or more photodetectors, the plurality of light emitters of the second optical sensor configured to emit optical radiation onto tissue of a second measurement site of the patient, the one or more photodetectors of the second optical sensor configured to detect the optical radiation attenuated by the tissue of the second measurement site and to output a second signal responsive to the light attenuation by the tissue of the second measurement site; and

one or more signal processors in electrical communication with the first and second optical sensors, the one or more signal processors configured to combine the first and second signals responsive to the light attenuation by the tissues of the first and second measurement sites into combined sensor data, process the combined sensor data to obtain and analyze combinations of features of the first signal and features of the second signal, the combinations comprising location information or body tissue information of the first measurement site and the second measurement site, and generate a measurement of a target physiological parameter based on analysis of the combinations of features.

11. The monitor of claim 10 , wherein the first optical sensor and the second optical sensor each comprises a plurality of photodetectors, the plurality of photodetectors of the first or second optical sensor distributed throughout a sensor area in contact with the first or second measurement site.

12. The monitor of claim 10 , wherein the first and second measurement sites comprise different types of body tissues.

13. The monitor of claim 10 , wherein the first measurement site is on the patient's head.

14. The monitor of claim 13 , wherein the first measurement site is the patient's nose.

15. The monitor of claim 10 , wherein the second measurement site is a peripheral site of the patient.

16. The monitor of claim 15 , wherein the second measurement site is the patient's finger.

17. The monitor of claim 10 , wherein the target physiological parameter comprises oxygen saturation, pulse rate, perfusion index, pleth variability index, methemoglobin, carboxyhemoglobin, total hemoglobin, and/or glucose.

18. The monitor of claim 10 , wherein the combinations of features further comprise non-normalized features, data from bulk absorption, or peripheral absorption signals.

19. The monitor of claim 10 , wherein the combinations of features further comprise linear feature and/or high-ordered features.

Assignments (1)
ASSIGNMENT OF ASSIGNOR'S INTEREST Recorded Jan 15, 2025
From: SHARMA, VIKRANT; PEREA, PHILIP
To: MASIMO CORPORATION
Reel/Frame 069885/0905 →
Continuity (3)
Continuation 15824983 · Nov 28, 2017
Provisional Application 62429458 · Dec 2, 2016
Related Publication 20230172545A1 · Jun 8, 2023
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