Implantable medical device with control of neural stimulation based on battery status

摘要

An implantable medical device is powered by a battery to deliver one or more therapies including at least one non-life-sustaining therapy such as neural stimulation for enhancing quality of life of a patient. When the battery approaches its end of life, the implantable medical device reduces power consumption of the neural stimulation (e.g., intensity of the neural stimulation) for extending the remaining battery life while maintaining a certain amount of therapeutic benefits for the patient. In one embodiment, the intensity of the neural stimulation is reduced in a tiered manner. In one embodiment in which the implantable medical device also delivers at least one life-sustaining cardiac stimulation therapy, the neural stimulation is disabled or adjusted to reduce its power consumption (e.g., intensity) while the intensity of the cardiac stimulation therapy is maintained when the battery is near its end of life.

主权项

1. An implantable medical device, comprising:
a battery; a battery monitoring circuit coupled to the battery, the battery monitoring circuit configured to measure a battery parameter indicative of an energy level of the battery; a neural stimulation circuit configured to deliver neural stimulation for modulating neural activities; a cardiac stimulation circuit configured to deliver cardiac stimulation including one or more of cardiac pacing or defibrillation; and a control circuit coupled to the battery monitoring circuit, the neural stimulation circuit, and the cardiac stimulation circuit, the control circuit configured to:
set a current power mode of the implantable medical device to a first predetermined reduced-power operation mode of a plurality of predetermined power modes in response to the battery parameter indicating that the energy level of the battery has fallen below a first energy level threshold;reduce a power consumption required for delivering the neural stimulation without reducing a power consumption required for delivering the cardiac stimulation during the first predetermined reduced-power operation mode;set a current power mode of the implantable medical device to a second predetermined reduced-power operation mode of the plurality of predetermined power modes in response to the battery parameter indicating that the energy level of the battery has fallen below a second energy level threshold; andreduce the power consumption required for delivering the neural stimulation and the power consumption required for delivering the cardiac stimulation during the second predetermined reduced-power operation mode.