Method of controlling an implantable medical device with optimized pump drive
First Claim
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1. A method for reducing energy consumption in an implantable infusion device having a stepper motor driving an infusion pump and powered by a power source having a power source voltage, said stepper motor being driven by drive pulses, comprising:
- receiving an instruction to infuse a therapeutic substance;
measuring said power source voltage;
calculating a duty cycle of said drive pulses for delivery within a substantially fixed drive interval to operate said stepper motor;
increasing said duty cycle of said drive pulses within said substantially fixed drive interval to operate said stepper motor as said power source voltage decreases; and
infusing said therapeutic substance when said stepper motor operates said infusion pump to meter said therapeutic substance.
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Abstract
Method of controlling an implantable medical device having a power source having a voltage, a therapeutic substance pump driven by a motor, electrically coupled to the power source, supplied with a series of drive pulses having a duty cycle. The voltage of the power source is measured. The duty cycle of drive pulses to the motor are varied by increasing the duty cycle as the voltage of the power source decreases.
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Citations
19 Claims
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1. A method for reducing energy consumption in an implantable infusion device having a stepper motor driving an infusion pump and powered by a power source having a power source voltage, said stepper motor being driven by drive pulses, comprising:
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receiving an instruction to infuse a therapeutic substance;
measuring said power source voltage;
calculating a duty cycle of said drive pulses for delivery within a substantially fixed drive interval to operate said stepper motor;
increasing said duty cycle of said drive pulses within said substantially fixed drive interval to operate said stepper motor as said power source voltage decreases; and
infusing said therapeutic substance when said stepper motor operates said infusion pump to meter said therapeutic substance. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A method of controlling an implantable medical device having a power source having a voltage, a therapeutic substance pump driven by a motor, electrically coupled to said power source, supplied with a series of drive pulses having a duty cycle, comprising the steps of:
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measuring said voltage of said power source; and
varying said duty cycle of drive pulses to said motor by increasing said duty cycle as said voltage of said power source decreases. - View Dependent Claims (10, 11, 12, 13, 14, 15, 16, 17, 18, 19)
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Specification