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;
a single 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 terminal, 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 same sensor output terminal, 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
20 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; a single 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 terminal, 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 same sensor output terminal, 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 single sensor signal modulated by patient respiration at a sensor output terminal; processing the single 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)
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Specification