Pulse oximeter with alternate heart-rate determination
First Claim
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1. A method for determining a heart rate in a pulse oximeter comprising:
- determining a first heart rate from a pulse oximetry signal using a first method;
determining a second heart rate from the pulse oximetry signal using a second method;
evaluating a reliability of the first heart rate using metrics applied to the pulse oximetry signal;
using the first heart rate when the metrics indicate the first method is reliable; and
using the second heart rate only when the metrics indicate that the first heart rate is unreliable.
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Abstract
A pulse oximeter which determines multiple heart rates, and selects between them based on the metrics of only one of the heart rate calculations. A primary heart rate calculation method is selected, and is used unless its metrics indicate questionable accuracy, in which case an alternative rate calculation is available and is used instead.
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Citations
20 Claims
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1. A method for determining a heart rate in a pulse oximeter comprising:
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determining a first heart rate from a pulse oximetry signal using a first method; determining a second heart rate from the pulse oximetry signal using a second method; evaluating a reliability of the first heart rate using metrics applied to the pulse oximetry signal; using the first heart rate when the metrics indicate the first method is reliable; and using the second heart rate only when the metrics indicate that the first heart rate is unreliable. - View Dependent Claims (2, 3, 4, 5, 15)
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6. A pulse oximeter which determines a heart rate, comprising:
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a first heart rate calculator for determining a first heart rate from a pulse oximetry signal using a first method; a second heart rate calculator for determining a second heart rate from the pulse oximetry signal using a second method; an evaluator configured to determine the reliability of the first heart rate using metrics applied to the pulse oximetry signal; and a selector configured to use the first heart rate when the metrics indicate said first method is reliable, and to use the second heart rate only when the metrics indicate that the first heart rate is unreliable. - View Dependent Claims (7, 8, 9, 10, 11)
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12. A pulse oximetry system comprising:
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a sensor adapted to provide a signal related to a physiological constituent; and a monitor adapted to process the signal to determine a pulse period, the monitor comprising; software adapted to determine a first pulse period from the signal using a first method; software adapted to determine a second pulse period from the signal using a second method; an evaluator configured to determine the reliability of the first pulse period using metrics applied to the pulse oximetry signal; and a selector configured to use the first pulse period when the metrics indicate the first pulse period is reliable, and to use the second pulse period only when the metrics indicate that the first pulse period is unreliable. - View Dependent Claims (13, 14)
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16. A method for determining a heart rate in a pulse oximeter comprising:
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determining a first pulse period from a pulse oximetry signal using a first method; evaluating a reliability of the first pulse period using metrics applied to the pulse oximetry signal; determining a second pulse period from the pulse oximetry signal using a second method only when the metrics indicate that the first pulse period is unreliable; converting the first pulse period into a heart rate when the metrics indicate that the first pulse period is reliable; and converting the second pulse period into a heart rate only when the metrics indicate that the first pulse period is unreliable. - View Dependent Claims (17, 18, 19, 20)
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Specification