IP Library › Granted Patent US 9,131,883
Granted Patent B2
US 9,131,883 · App. 14/065,339 · Granted Sep 15, 2015

Physiological trend monitor

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Quick Facts
Patent No.
US 9,131,883
App. No.
14/065,339
Granted
Sep 15, 2015
Kind
B2
Abstract

A physiological trend monitor has a sensor signal responsive to multiple wavelengths of light transmitted into a tissue site. The transmitted light is detected after attenuation by pulsatile blood flow within the tissue site. A processor has an input responsive to the sensor signal and a physiological parameter output. Features are extracted from the physiological parameter output. Criteria are applied to the features. An alarm output is generated when the criteria are satisfied.

Claims (27)

1. A system for monitoring physiological trends, the system comprising:

a processor configured to:

receive a sensor signal from an optical sensor coupled with a patient, the sensor signal responsive to light attenuated by body tissue of the patient;

detect a blood parameter trend based on the sensor signal;

generate an audible alarm responsive to a calculated slope of the blood parameter trend; and

suppress the audible alarm responsive to the calculated slope reaching a positive value.

2. The system of claim 1 , wherein the processor is further configured to generate the audible alarm responsive to the calculated slope of the blood parameter trend being negative.

3. The system of claim 1 , wherein the processor is further configured to generate the audible alarm responsive to the calculated slope of the blood parameter trend being zero.

4. The system of claim 1 , wherein the processor is further configured to detect a smoothed blood parameter from the sensor signal.

5. The system of claim 4 , wherein the processor is further configured to suppress the audible alarm responsive to the smoothed blood parameter exceeding a threshold.

6. A system for monitoring physiological trends, the system comprising:

a processor configured to:

receive a sensor signal from an optical sensor coupled with a patient, the sensor signal responsive to light attenuated by body tissue of the patient;

determine a trend of blood parameter values based on the sensor signal; and

generate an audible alarm in response to a calculated slope of the trend reaching a negative or zero value.

7. The system of claim 6 , wherein the processor is further configured to suppress the audible alarm responsive to the calculated slope reaching a positive value.

8. The system of claim 6 , wherein the processor is further configured to detect a smoothed blood parameter from the sensor signal.

9. The system of claim 8 , wherein the processor is further configured to suppress the audible alarm responsive to the smoothed blood parameter exceeding a threshold.

10. A system for monitoring physiological trends, the system comprising:

a processor configured to:

receive a sensor signal from an optical sensor coupled with a patient, the sensor signal responsive to light attenuated by body tissue of the patient;

determine a blood parameter based on the sensor signal;

determine a blood parameter trend based on the sensor signal;

generate an audible alarm responsive to the blood parameter and responsive to a calculated slope of the blood parameter trend.

11. The system of claim 9 , wherein the processor is further configured to generate the audible alarm in response to the calculated slope of the blood parameter trend reaching a negative or zero value.

12. The system of claim 9 , wherein the processor is further configured to suppress the audible alarm responsive to the calculated slope of the blood parameter trend reaching a positive value.

13. The system of claim 9 , wherein the audible alarm is further responsive to the blood parameter reaching a threshold.