Rate smoothing control
First Claim
1. A cardiac pacing system, comprising:
- a sensor configured to monitor a physiologic parameter other than intrinsic electrical cardiac depolarizations, the physiologic parameter including a physical activity;
a processing circuit coupled to the sensor, the processing circuit configured to translate the physical activity into an activity level;
a state detector coupled to the processing circuit, the state detector configured to detect a predetermined state of the physiologic parameter and including an activity level detector configured to determine whether the activity level matches the predetermined state of the physiologic parameter by comparing the activity level to one or more predetermined activity levels; and
a controller circuit configured to determine and control a pacing rate, the controller circuit including a rate smoothing module configured to perform rate smoothing that limits a rate of change in the pacing rate, the rate smoothing module coupled to the state detector and configured to receive the physiologic parameter and activate the rate smoothing, deactivate the rate smoothing, or adjust one or more rate smoothing parameters of the rate smoothing in response to a detection of the predetermined state of the physiologic parameter.
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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
21 Claims
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1. A cardiac pacing system, comprising:
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a sensor configured to monitor a physiologic parameter other than intrinsic electrical cardiac depolarizations, the physiologic parameter including a physical activity; a processing circuit coupled to the sensor, the processing circuit configured to translate the physical activity into an activity level; a state detector coupled to the processing circuit, the state detector configured to detect a predetermined state of the physiologic parameter and including an activity level detector configured to determine whether the activity level matches the predetermined state of the physiologic parameter by comparing the activity level to one or more predetermined activity levels; and a controller circuit configured to determine and control a pacing rate, the controller circuit including a rate smoothing module configured to perform rate smoothing that limits a rate of change in the pacing rate, the rate smoothing module coupled to the state detector and configured to receive the physiologic parameter and activate the rate smoothing, deactivate the rate smoothing, or adjust one or more rate smoothing parameters of the rate smoothing in response to a detection of the predetermined state of the physiologic parameter. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21)
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Specification