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 an acceleration signal at an accelerometer output terminal;
a first filter channel configured to attenuate first frequencies of the acceleration signal to produce a first filtered output;
a second filter channel, separate from the first filter channel, the second filter channel configured to attenuate second frequencies of the acceleration signal to produce a second filtered output indicative of phrenic nerve activation; and
circuitry configured to evaluate a level of patient activity based at least in part on the first filtered output and to detect phrenic nerve activation caused by cardiac pacing based at least in part the second filtered output.
0 Assignments
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.
39 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 an acceleration signal at an accelerometer output terminal; a first filter channel configured to attenuate first frequencies of the acceleration signal to produce a first filtered output; a second filter channel, separate from the first filter channel, the second filter channel configured to attenuate second frequencies of the acceleration signal to produce a second filtered output indicative of phrenic nerve activation; and circuitry configured to evaluate a level of patient activity based at least in part on the first filtered output and to detect phrenic nerve activation caused by cardiac pacing based at least in part the second filtered output. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
-
-
12. A medical device, comprising:
-
a pulse generator configured to deliver cardiac pacing; an accelerometer configured to generate an acceleration signal at an accelerometer output terminal; programmable signal processing circuitry coupled to the accelerometer output terminal, the signal processing circuitry programmable to have a first set of signal processing characteristics that produce a first output that is indicative of one or more characteristics of a patient'"'"'s state, the signal processing circuitry programmable to have a second set of signal processing characteristics that produces a second output, the second output indicative of phrenic nerve activation, 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 (13, 14, 15)
-
-
16. A method of operating an implantable medical device, comprising:
-
sensing one or more characteristics of a patient using an accelerometer, and generating a sensor signal at a sensor output terminal; filtering the sensor 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 one or more characteristics of a patient'"'"'s state 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 (17, 18, 19, 20)
-
Specification