Therapy delivery mode selection
First Claim
1. A medical device comprising:
- stimulation circuitry configured to deliver one of constant voltage or constant current stimulation;
an activity sensor to sense patient activity;
an impedance measurement circuit for measuring an impedance presented to the stimulation circuitry; and
a processor configured to determine a measurement frequency for impedance measurements based on the sensed patient activity, control the impedance measurement circuit to measure the presented impedance at the measurement frequency, and adjust an amplitude of the stimulation based on the measured impedance to substantially provide the other of constant voltage or constant current stimulation.
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Abstract
Techniques for selectably providing either constant voltage or constant current stimulation are described. A programming device provides a user interface by which a user selects either constant voltage or constant current stimulation, and selects either a voltage or current amplitude based on the selected stimulation mode. The programming device configures a medical device to provide the selected mode of stimulation at the selected amplitude. For example, when a medical device has constant voltage stimulation circuitry, e.g., circuitry including a voltage source, and the user selects constant current stimulation, the programming device configures the medical device to adjust the voltage amplitude based on a measured impedance to provide substantially constant current amplitude.
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Citations
20 Claims
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1. A medical device comprising:
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stimulation circuitry configured to deliver one of constant voltage or constant current stimulation; an activity sensor to sense patient activity; an impedance measurement circuit for measuring an impedance presented to the stimulation circuitry; and a processor configured to determine a measurement frequency for impedance measurements based on the sensed patient activity, control the impedance measurement circuit to measure the presented impedance at the measurement frequency, and adjust an amplitude of the stimulation based on the measured impedance to substantially provide the other of constant voltage or constant current stimulation. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A method comprising:
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sensing patient activity; determining a measurement frequency for impedance measurements based on the sensed activity; measuring an impedance presented to stimulation circuitry of a medical device at the determined measurement frequency, wherein the stimulation circuitry is configured to provide one of constant voltage or constant current stimulation; and adjusting an amplitude of the stimulation based on the measured impedance to substantially provide the other of constant voltage or constant current stimulation. - View Dependent Claims (12, 13, 14, 15)
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16. A medical device comprising:
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means for sensing patient activity; means for determining a measurement frequency for impedance measurements based on the sensed activity; means for measuring an impedance presented to stimulation circuitry of a medical device at the determined measurement frequency, wherein the stimulation circuitry is configured to provide one of constant voltage or constant current stimulation; and means for adjusting an amplitude of the stimulation based on the measured impedance to substantially provide the other of constant voltage or constant current stimulation. - View Dependent Claims (17, 18, 19, 20)
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Specification