Respiration Sensor Processing for Phrenic Nerve Activation Detection
AssigneeCardiac Pacemakers, Inc.
InventorsAaron R. McCabe, Holly E. Rockweiler, Jacob L. Laughner
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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.
Claims23
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.
A method of operating an implantable medical device, comprising:
- 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.
A medical device, comprising:
- 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.
Dependencies are inferred from the claim text.