Respiration Sensor Processing for Phrenic Nerve Activation Detection
First Claim
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1. An implantable medical device, comprising:
- a pulse generator configured to deliver cardiac pacing to a heart;
an impedance sensor configured to generate a signal modulated by patient respiration, the sensor signal available at a sensor output terminal;
a first filter channel coupled to the sensor output, the first filter channel configured to attenuate first frequencies of the sensor signal to produce a first filtered output;
a second filter channel, separate from the first filter channel, coupled to the sensor output, the second filter channel configured to attenuate second frequencies of the sensor signal to produce a second filtered output; and
circuitry configured to evaluate patient respiration using the first filtered output and to detect phrenic nerve activation caused by cardiac pacing using the second filtered output.
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Abstract
An implantable cardiac device includes a sensor for sensing patient respiration and detecting phrenic nerve activation. A first filter channel attenuates first frequencies of the sensor signal to produce a first filtered output. A second filter channel attenuates second frequencies of the respiration signal to produce a second filtered output. Patient activity is evaluated using the first filtered output and phrenic nerve activation caused by cardiac pacing is detected using the second filtered output.
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Citations
23 Claims
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1. An implantable medical device, comprising:
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a pulse generator configured to deliver cardiac pacing to a heart; an impedance sensor configured to generate a signal modulated by patient respiration, the sensor signal available at a sensor output terminal; a first filter channel coupled to the sensor output, the first filter channel configured to attenuate first frequencies of the sensor signal to produce a first filtered output; a second filter channel, separate from the first filter channel, coupled to the sensor output, the second filter channel configured to attenuate second frequencies of the sensor signal to produce a second filtered output; and circuitry configured to evaluate patient respiration using the first filtered output and to detect phrenic nerve activation caused by cardiac pacing using the second filtered output. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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14. A method of operating an implantable medical device, comprising:
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sensing patient respiration and generating a sensor signal modulated by patient respiration at a sensor output terminal; processing the sensor signal through separate signal processing channels, the separate signal processing channels comprising a first signal processing channel having first signal processing characteristics and a second signal processing channel having second signal processing characteristics; evaluating patient respiration using an output of the first signal processing channel; and detecting phrenic nerve activation caused by cardiac pacing using an output of the second signal processing channel. - View Dependent Claims (15, 16, 17, 18, 19, 20)
ending the phrenic nerve activation detection interval during the cardiac cycle; and sensing for the phrenic nerve activation during the phrenic nerve detection interval.
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19. The method of claim 14, further comprising:
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determining a transition zone for phrenic nerve activation; determining a cardiac capture threshold; and setting a cardiac pacing energy above the cardiac capture threshold and below a transition zone threshold for phrenic nerve activation.
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20. The method of claim 14, further comprising switching from one cardiac pacing electrode configuration to another cardiac pacing electrode configuration based on detection of the phrenic nerve stimulation.
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21. A medical device, comprising:
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a pulse generator configured to deliver cardiac pacing; a sensor configured to produce a sensor signal at a sensor output terminal; programmable signal processing circuitry coupled to the sensor output terminal, the signal processing circuitry programmable to have a first set of signal processing characteristics that produce a first output, the signal processing circuitry programmable to have a second set of signal processing characteristics that produces a second output, wherein at least some of the first signal processing characteristics are different from at least some of the second signal processing characteristics; and processing circuitry configured to determine a rate-adaptation parameter using the first output and to detect phrenic nerve activation caused by the cardiac pacing using the second output. - View Dependent Claims (22, 23)
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Specification