System and method for detecting presence of an infusion cartridge in an infusion pump
AssigneeTandem Diabetes Care, Inc.
InventorGeoffrey Kruse
Life of this patent
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Abstract
Infusion devices, systems, and methods can detect a presence or absence of an infusion cartridge in an infusion pump. Embodiments may include a loading sequence, recording loading pulse width modulation (PWM) commands applied to an infusion pump motor during the loading sequence, setting a value of threshold PWM commands based on the commands applied during the loading sequence and comparing values of operational PWM commands applied during pumping operations to the value of the threshold PWM commands. If the value of the operational PWM commands drops below the threshold by a predetermined amount, a missing infusion cartridge warning may be generated.
Claims23
A method for detecting a presence of an infusion cartridge in an infusion pump, comprising:
- installing an infusion cartridge in an infusion pump;
- initiating an infusion cartridge loading sequence;
- recording loading pulse width modulation (PWM) commands applied to an infusion pump motor during the loading sequence;
- setting a value of threshold PWM commands based on the loading PWM commands applied to the infusion pump motor during the loading sequence;
- comparing values of operational PWM commands that are applied during pumping operations to the value of the threshold PWM commands, the operational PWM commands being command input into the infusion pump motor causing the infusion pump motor to operate a drive mechanism of the infusion pump;
- and
- generating a missing cartridge indication if the values of the operational PWM commands drop below the value of the threshold PWM commands by a predetermined amount.
8-19. (canceled)
A method for detecting a presence of an infusion cartridge in an infusion pump, comprising:
- storing a threshold value of PWM commands;
- executing a closed loop motor control algorithm to generate operational PWM commands, the operational PWM commands representing a measure of command input into an electric motor of the infusion pump that cause the electric motor to power a drive mechanism of the infusion pump;
- operating the drive mechanism of the infusion pump in response to the operational PWM commands;
- comparing values of the operational PWM commands that are applied while operating the drive mechanism to the threshold value;
- and
- generating a missing cartridge indication if the values of the operational PWM commands drop below the threshold value by a predetermined amount.
Dependencies are inferred from the claim text.