Rate smoothing control
First Claim
1. A system, comprising:
- a signal input circuit including at least one of a cardiac sense amplifier adapted to monitor a cardiac signal and a sensor adapted to monitor a physiologic parameter; and
a controller circuit, including;
a predetermined state detector coupled to the signal input circuit, the predetermined state detector adapted to detect a predetermined state from the at least one of the cardiac signal and the physiologic parameter, the predetermined state including at least one of a heart rate state, a cardiac rhythm state, a patient activity state, a respiration state, and a metabolic need state; and
a rate smoothing module, coupled to the predetermined state detector and including at least one rate smoothing algorithm, the rate smoothing module configured to select a first rate smoothing percentage and a second rate smoothing percentage of the rate smoothing algorithm based on whether the predetermined state is present, the first rate smoothing percentage limiting a degree of pacing rate increase, the second rate smoothing percentage limiting a degree of pacing rate drop.
1 Assignment
0 Petitions
Accused Products
Abstract
A rate smoothing function used in implantable pulse generators uses detected triggering events, which cause the rate smoothing function to be activated or deactivated, and detected parameter adjusting events, which cause parameter(s) of the rate smoothing function to be changed. In one example, the activation/deactivation and/or change to the parameters of the rate smoothing function are temporary, and the pre-event state of the rate smoothing function is set to a post-adjusting state, such as after a first time interval. Rate smoothing may be selected, activated or deactivated, or adjusted based on a cardiac signal state, or based on an activity or other physiological sensor signal. The adjusted rate smoothing parameters may include an up-smoothing percentage to limit a speed of pacing rate increase and a down-smoothing percentage to limit a speed of pacing rate drop.
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Citations
36 Claims
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1. A system, comprising:
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a signal input circuit including at least one of a cardiac sense amplifier adapted to monitor a cardiac signal and a sensor adapted to monitor a physiologic parameter; and a controller circuit, including; a predetermined state detector coupled to the signal input circuit, the predetermined state detector adapted to detect a predetermined state from the at least one of the cardiac signal and the physiologic parameter, the predetermined state including at least one of a heart rate state, a cardiac rhythm state, a patient activity state, a respiration state, and a metabolic need state; and a rate smoothing module, coupled to the predetermined state detector and including at least one rate smoothing algorithm, the rate smoothing module configured to select a first rate smoothing percentage and a second rate smoothing percentage of the rate smoothing algorithm based on whether the predetermined state is present, the first rate smoothing percentage limiting a degree of pacing rate increase, the second rate smoothing percentage limiting a degree of pacing rate drop. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15)
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16. A method, comprising:
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monitoring at least one of a cardiac signal using a cardiac sense amplifier of an implantable system and a physiologic parameter using a sensor of the implantable system; determining whether a state of the at least one of the cardiac signal and the physiologic parameter corresponds to a predetermined state including at least one of a heart rate state, a cardiac rhythm state, a patient activity level state, a respiration state, and a metabolic need state using the implantable system; and selecting a first rate smoothing percentage and a second rate smoothing percentage of a rate smoothing algorithm using the implantable system if the state of the at least one of the cardiac signal and the physiologic parameter corresponds to the predetermined state, the first rate smoothing percentage limiting a speed of pacing rate increase, the second rate smoothing percentage limiting a speed of pacing rate drop. - View Dependent Claims (17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31)
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32. A method, comprising:
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monitoring a cardiac signal using a cardiac sense amplifier of an implantable system; determining whether a state of the cardiac signal corresponds to at least one predetermined heart rate state using the implantable system; and selecting a first rate smoothing percentage and a second rate smoothing percentage of a rate smoothing algorithm using the implantable system if the state of the cardiac signal corresponds to the at least one predetermined heart rate state, the first rate smoothing percentage limiting a speed of pacing rate increase, the second rate smoothing percentage limiting a speed of pacing rate drop.
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33. A method, comprising:
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monitoring a signal; determining whether a state of the signal corresponds to at least a predetermined cardiac rhythm state; and selecting a rate smoothing algorithm based on the determined state, the rate smoothing algorithm including a first rate smoothing percentage to limit a speed of pacing rate increase and a second rate smoothing percentage to limit a speed of pacing rate drop.
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34. A method, comprising:
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monitoring a signal; determining whether a state of the signal corresponds to at least a predetermined patient activity level state; and selecting a rate smoothing algorithm based on the determined state, the rate smoothing algorithm including a first rate smoothing percentage to limit a speed of pacing rate increase and a second rate smoothing percentage to limit a speed of pacing rate drop.
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35. A method, comprising:
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monitoring a signal; determining whether a state of the signal corresponds to at least a predetermined respiration state; and selecting a rate smoothing algorithm based on the determined state, the rate smoothing algorithm including a first rate smoothing percentage to limit a speed of pacing rate increase and a second rate smoothing percentage to limit a speed of pacing rate drop.
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36. A method, comprising:
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monitoring a signal; determining whether a state of the signal corresponds to at least a predetermined metabolic need state; and selecting a rate smoothing algorithm based on the determined state, the rate smoothing algorithm including a first rate smoothing percentage to limit a speed of pacing rate increase and a second rate smoothing percentage to limit a speed of pacing rate drop.
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Specification