PHYSIOLOGICAL TREND MONITOR
First Claim
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1. An patient monitor configured to receive sensor signals from an optical sensor responsive to attenuation of light by body tissue at a measurement site, the monitor comprising:
- a processor determining measurement values of a physiological parameter, said measurement values responsive to said sensor signals;
an alarm indicator receiving smoothed values of said measurement values of said physiological parameter and receiving predictive values of said measurement values of said physiological parameter;
an alarm; and
a memory storing first and second criteria, each indicative of alarm conditions, said first criteria being relevant to said smoothed values and said second criteria being relevant to said predictive values,said alarm indicator comparing features to said first criteria, and when said features match said first criteria, triggering said alarm, andsaid alarm indicator comparing features to said second criteria, and when said features match said second criteria, triggering said alarm.
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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.
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Citations
20 Claims
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1. An patient monitor configured to receive sensor signals from an optical sensor responsive to attenuation of light by body tissue at a measurement site, the monitor comprising:
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a processor determining measurement values of a physiological parameter, said measurement values responsive to said sensor signals; an alarm indicator receiving smoothed values of said measurement values of said physiological parameter and receiving predictive values of said measurement values of said physiological parameter; an alarm; and a memory storing first and second criteria, each indicative of alarm conditions, said first criteria being relevant to said smoothed values and said second criteria being relevant to said predictive values, said alarm indicator comparing features to said first criteria, and when said features match said first criteria, triggering said alarm, and said alarm indicator comparing features to said second criteria, and when said features match said second criteria, triggering said alarm. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A method of triggering an alarm to alert a caregiver of a need for attention to a patient wearing a patient monitor configured to receive sensor signals from an optical sensor responsive to attenuation of light by body tissue of said patient, the method comprising:
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determining measurement values of a physiological parameter with a processor, said measurement values responsive to said sensor signals; receiving smoothed values of said measurement values of said physiological parameter; receiving predictive values of said measurement values of said physiological parameter; storing first and second criteria, each indicative of alarm conditions, said first criteria being relevant to said smoothed values and said second criteria being relevant to said predictive values; comparing features to said first criteria; when said features match said first criteria, triggering said alarm; comparing features to said second criteria; and when said features match said second criteria, triggering said alarm. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17, 18)
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19. A parallel alarm for a patient monitor, said patient monitor configured to receive sensor signals from a sensor responsive to attenuation of light by body tissue, the parallel alarm comprising:
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a memory; an alarm activating upon receiving an alarm trigger; a threshold detector receiving relatively slow changing physiological parameter data response to said sensor signals, electronically comparing said relatively slow changing physiological parameter data to threshold data stored in said memory, and outputting said alarm trigger when said relatively slow changing physiological parameter data compares with said threshold data in a predetermined manner; and a pattern comparator receiving relatively fast changing physiological parameter data response to said sensor signals, electronically comparing said relatively fast changing physiological parameter data to pattern data stored in said memory, and outputting said alarm trigger when said relatively fast changing physiological parameter data compares with said pattern data in a predetermined manner. - View Dependent Claims (20)
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Specification