Method and apparatus for monitoring sensor performance during rate-responsive cardiac stimulation
First Claim
1. A method of monitoring sensor performance for use in a cardiac stimulation device, the method comprising:
- receiving sensor signals from a plurality of non-heart-rate sensors;
processing the sensor signals to calculate sensor indicated rates for each sensor;
calculating a difference between the sensor indicated rates; and
storing the sensor indicated rates if the difference between the sensor indicated rates exceeds a discrepancy threshold.
1 Assignment
0 Petitions
Accused Products
Abstract
A cardiac stimulation device and method monitor and store discrepancies in sensor indicated rates determined from two or more sensors generating signals related to metabolic demand. One feature included in the present invention is a sensor cross-check record that stores the time, duration and sensor indicated rates whenever individual sensor indicated rates differ by more than a discrepancy threshold. This record allows a clinician to monitor an abnormal patient condition or determine if a sensor is not functioning properly or is programmed sub-optimally. Another feature provided by the present invention is a sensor cross-check histogram in which sensor indicated rate differences are stored. Histogram data aids the clinician in selecting programmable operating parameters that control the calculation of sensor indicated rates and the rate response of the cardiac stimulation device.
81 Citations
34 Claims
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1. A method of monitoring sensor performance for use in a cardiac stimulation device, the method comprising:
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receiving sensor signals from a plurality of non-heart-rate sensors; processing the sensor signals to calculate sensor indicated rates for each sensor; calculating a difference between the sensor indicated rates; and storing the sensor indicated rates if the difference between the sensor indicated rates exceeds a discrepancy threshold. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A method of monitoring sensor performance for use in a cardiac stimulation device, the method comprising:
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receiving sensor signals from a plurality of sensors; processing the sensor signals to calculate sensor indicated rates for each sensor; calculating a difference between the sensor indicated rates; storing the sensor indicated rates if the difference between the sensor indicated rates exceeds a discrepancy threshold; increasing a value of a duration counter when both a current difference and a preceding difference between the sensor indicated rates exceed a discrepancy threshold; and setting the value of the duration counter as the duration of the sensor indicated rate discrepancy when the difference between the sensor indicated rates does not exceed a discrepancy threshold and the preceding difference between sensor indicated rates exceeded the discrepancy threshold.
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9. A method of monitoring sensor performance for use in a cardiac stimulation device, the method comprising:
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receiving sensor signals from a plurality of sensors; processing the sensor signals to calculate sensor indicated rates for each sensor; calculating a difference between the sensor indicated rates; storing the sensor indicated rates if the difference between the sensor indicated rates exceeds a discrepancy threshold; and setting the discrepancy threshold as any of a predetermined percentage or a predefined percentage of a difference between a maximum sensor rate and a base rate.
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10. A method of monitoring sensor performance for use in a cardiac stimulation device, the method comprising:
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receiving sensor signals from a plurality of sensors; processing the sensor signals to calculate sensor indicated rates for each sensor; calculating a difference between the sensor indicated rates; storing the sensor indicated rates if the difference between the sensor indicated rates exceeds a discrepancy threshold; and displaying stored discrepancy times, discrepancy durations, and sensor indicated rates. - View Dependent Claims (11, 12, 13, 14)
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15. A method of monitoring sensor performance for use in a cardiac stimulation device, the method comprising:
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receiving sensor signals from a plurality of sensors; processing the sensor signals to calculate sensor indicated rates for each sensor; calculating a difference between the sensor indicated rates; storing the sensor indicated rates if the difference between the sensor indicated rates exceeds a discrepancy threshold; and storing a histogram of sensor indicated rate differences by; assigning a set of histogram bins to first and second sensors, wherein each bin is assigned to a distinct rate difference; and increasing a value stored in a histogram bin assigned to the first sensor and to a rate difference, when the sensor indicated rate corresponding to the first sensor is greater than the sensor indicated rate corresponding to the second sensor. - View Dependent Claims (16, 17, 18, 19)
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20. A cardiac stimulation device for monitoring sensor performance, comprising:
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a plurality of non-heart-rate sensors that generate sensor signals; a memory that is configured to store sensor indicated rates; and a controller coupled to the memory and to the sensors, the controller being operative to receive sensor signals from the sensors and calculate sensor indicated rates based on the sensor signals, wherein the controller is operative to calculate a difference between the sensor indicated rates and store the sensor indicated rates in the memory if the difference between the sensor indicated rates exceeds a discrepancy threshold. - View Dependent Claims (21, 22, 23, 24, 25)
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26. A cardiac stimulation device for monitoring sensor performance, comprising:
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a plurality of sensors that generate sensor signals; a memory that is configured to store sensor indicated rates; a controller coupled to the memory and to the sensors, the controller being operative to receive sensor signals from the sensors and calculate sensor indicated rates based on the sensor signals, wherein the controller is operative to calculate a difference between the sensor indicated rates and store the sensor indicated rates in the memory if the difference between the sensor indicated rates exceeds a discrepancy threshold, wherein the discrepancy threshold is any of a predetermined percentage or a predefined percentage of a difference between a maximum sensor rate and a base rate.
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27. A cardiac stimulation device for monitoring sensor performance, comprising:
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a plurality of sensors that generate sensor signals; a memory that is configured to store sensor indicated rates; a controller coupled to the memory and to the sensors, the controller being operative to receive sensor signals from the sensors and calculate sensor indicated rates based on the sensor signals, wherein the controller is operative to calculate a difference between the sensor indicated rates and store the sensor indicated rates in the memory if the difference between the sensor indicated rates exceeds a discrepancy threshold; and a histogram that stores sensor indicated rate differences calculated by; assigning a set of histogram bins to first and second sensors, wherein each bin is assigned to a distinct rate difference; and increasing a value stored in a histogram bin assigned to the first sensor and to a rate difference, when the sensor indicated rate corresponding to the first sensor is greater than the sensor indicated rate corresponding to the second sensor. - View Dependent Claims (28)
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29. A cardiac stimulation device for monitoring sensor performance, comprising:
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means for receiving non-heart-rate sensor signals from a plurality of sensors and for calculating sensor indicated rates for the sensor signals; means for calculating a difference between the sensor indicated rates; means for determining a sensor indicated rate discrepancy if the difference between the sensor indicated rates exceeds a discrepancy threshold; and means for storing the sensor indicated rates when a sensor indicated rate discrepancy is determined. - View Dependent Claims (30, 31, 32, 33, 34)
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Specification