Activity Sensor Processing for Phrenic Nerve Activation Detection
First Claim
Patent Images
1. 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.
1 Assignment
0 Petitions
Accused Products
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.
-
Citations
20 Claims
-
1. 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. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
-
-
11. 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. - View Dependent Claims (12, 13)
-
-
14. 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. - View Dependent Claims (15, 16, 17)
-
-
18. 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. - View Dependent Claims (19, 20)
-
Specification