Back to results
US 2010/0305647 A1Published application
Activity Sensor Processing for Phrenic Nerve Activation Detection
AssigneeCardiac Pacemakers, Inc.
InventorsAaron R. McCabe, Holly E. Rockweiler, Jacob L. Laughner
Life of this patent
Estimating the term…
Abstract
An implantable cardiac device includes a sensor for sensing patient activity 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 accelerometer 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.
Claims20
An implantable medical device, comprising:
- a pulse generator configured to deliver cardiac pacing to a heart;
- an accelerometer configured to generate a signal modulated by acceleration that is available at an accelerometer output terminal;
- a first filter channel coupled to the accelerometer output terminal, the first filter channel configured to attenuate first frequencies of the accelerometer signal to produce a first filtered output;
- a second filter channel coupled to the accelerometer output, separate from the first filter channel, the second filter channel configured to attenuate second frequencies of the accelerometer signal to produce a second filtered output;
- and
- circuitry coupled to the first filter channel and the second filter channel and configured to evaluate a level of patient activity using the first filtered output and to detect phrenic nerve activation caused by cardiac pacing using the second filtered output.
3 more elements
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.
2 more elements
A method of operating an implantable medical device, comprising:
- sensing patient movement and generating a signal modulated by patient movement at a sensor output terminal;
- filtering the signal through separate filter channels to produce a first filtered output and a second filtered output, the separate filter channels comprising a first filter channel having first filter characteristics configured to attenuate a first set of frequencies from the signal and a second filter channel having second filter characteristics configured to attenuate a second set of frequencies from the signal;
- detecting patient activity using the first filtered output;
- detecting phrenic nerve activation caused by cardiac pacing using the second filtered output;
- and
- producing an output in response to detecting phrenic nerve activation.
3 more elements
An implantable medical device, comprising:
- means for sensing patient movement and generating a signal modulated by patient movement at a sensor output terminal;
- means for filtering the signal through separate filter channels to produce a first filtered output and a second filtered output, the separate filter channels comprising a first filter channel having first filter characteristics configured to attenuate a first set of frequencies from the signal and a second filter channel having second filter characteristics configured to attenuate a second set of frequencies from the signal;
- means for detecting patient activity using the first filtered output;
- means for detecting phrenic nerve activation caused by cardiac pacing using the second filtered output;
- and
- means for producing an output in response to detecting phrenic nerve activation.
3 more elements
Dependencies are inferred from the claim text.