Pulse oximetry data confidence indicator

• US 8,046,040 B2
• Filed: 04/04/2006
• Issued: 10/25/2011
• Est. Priority Date: 01/07/1999
• Status: Active Grant

• Current Assignee: Masimo Corporation
• Original Assignee: Masimo Corporation
• Inventors: Novak, Jerome J., Breed, Divya S., Kiani, Massi E., Ali, Ammar Al
• Primary Examiner(s): WINAKUR, ERIC FRANK
• Application Number:
  US11/397,372
• Publication Number:
  US 20060195025A1
• Time in Patent Office: 2,030 Days
• Field of Search: 600/309, 600/310, 600/322, 600/323, 600/336, 600/500, 600/502
• US Class Current: 600/310
• CPC Class Codes: A61B 5/02416 using photoplethysmograph signals, e.g. generated by infrared radiation A61B5/14552 takes precedence
• CPC Class Codes: A61B 5/1455 using optical sensors, e.g. spectral photometrical oximeters
• CPC Class Codes: A61B 5/14551 for measuring blood gases
• CPC Class Codes: A61B 5/7207 of noise induced by motion artifacts
• CPC Class Codes: A61B 5/7214 using signal cancellation, e.g. based on input of two identical physiological sensors spaced apart, or based on two signals derived from the same sensor, for different optical wavelengths
• CPC Class Codes: A61B 5/7221 Determining signal validity, reliability or quality A61B5/7207 and A61B5/7217 take precedence
• CPC Class Codes: A61B 5/7405 using sound
• CPC Class Codes: A61B 5/746 Alarms related to a physiological condition, e.g. details of setting alarm thresholds or avoiding false alarms alarms per se G08B
• CPC Class Codes: G16Z 99/00 Subject matter not provided for in other main groups of this subclass

Abstract

According to some embodiments of the present invention, a display is used to show an indication of the signal'"'"'s quality. This indication of the signal'"'"'s quality may be provided in a number of ways, including one or more audio and/or visual alarms.

Claims

1. A patient monitor including one or more alarms responsive to physiological data acquired through a noninvasive sensor, the patient monitor comprising:

one or more alarms configured to attract the attention of a caregiver;

a physiological data input configured to receive physiological data responsive to light attenuated by body tissue of a monitored patient;

a signal quality measure input configured to receive signal quality data responsive to a measure of a quality of the received physiological data;

an alarm threshold input configured to receive first and second threshold indications different from one another, the indications representing what values of data should attract said attention of said caregiver;

an alarm trigger output configured to send an alarm trigger to activate one or more of said one or more alarms; and

a processing device adapted to reduce a probability of missed true alarm conditions during high confidence and reduce a probability of false alarm conditions during low confidence, said processing device varying a buffer delay of said received physiological data, said varying responsive to said received signal quality data, said processing device responsive to said delayed physiological data, said threshold indications, and said received physiological data to determine when to output said alarm trigger.

2. The patient monitor of claim 1, wherein the physiological data comprises an indication of saturation.

3. The patient monitor of claim 1, wherein the physiological data comprises an indication of pulse rate.

4. The patient monitor of claim 1, wherein the signal quality data comprises an indication of data integrity.

5. The patient monitor of claim 1, wherein the signal quality data comprises an indication of pulse rate density.

6. The patient monitor of claim 1, wherein the signal quality data comprises an indication of harmonic ratio.

7. The patient monitor of claim 1, wherein the signal quality data comprises an indication of signal distortion.

8. The patient monitor of claim 7, wherein the signal distortion comprises motion induced noise.

9. The patient monitor of claim 7, wherein the signal distortion comprises noise.

10. The patient monitor of claim 1, wherein said processing device compares said threshold indication with said delayed physiological data, compares said threshold indication with said received physiological data, and outputs said alarm trigger responsive to said comparisons.

11. The patient monitor of claim 10, wherein said processing device outputs said alarm trigger when the comparisons are each at or below said threshold indication.

12. A method of reducing a probability of missed true alarm conditions during high confidence and reduce a probability of false alarm conditions during low confidence in a monitor measuring indications of physiological conditions of a patient through a noninvasive sensor, the method comprising:

receiving physiological data responsive to light attenuated by body tissue of a monitored patient;

receiving signal quality data responsive to a measure of a quality of the received physiological data;

receiving threshold indications different from one another of what values of data should attract said attention of said caregiver;

varying a buffer delay of said received physiological data, said varying responsive to said received signal quality data; and

outputting an alarm trigger responsive to said delayed physiological data, said threshold indications, and said received physiological data.

13. The method of claim 12, comprising:

comparing a first of said threshold indications with said delayed physiological data;

comparing a second of said threshold indications with said received physiological data; and

outputting an alarm trigger responsive to said comparisons to activate one or more alarms configured to attract the attention of said caregiver.

14. The method of claim 13, wherein said outputting comprises outputting said alarm trigger when the comparisons are each at or below its respective threshold indication.

15. The method of claim 12, wherein said receiving said physiological data comprises receiving at least one of an indication of saturation or an indication of pulse rate.

16. The method of claim 12, wherein said receiving said signal quality data at least one of an indication of data integrity, an indication of pulse rate density, an indication of harmonic ratio, and an indication of signal distortion.

17. The method of claim 16, wherein the signal quality data comprises said indication of signal distortion and said signal distortion comprises motion induced noise.

18. The method of claim 16, wherein the signal quality data comprises said indication of signal distortion and said signal distortion comprises noise.