Patent ID: 11896799
Assignee: TANDEM DIABETES CARE, INC.
Field: Medical technology (Instruments)
Classification: CPC A | IPC A

Claim 11:
12. 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 electrical command input into an electric motor of the infusion pump that cause the electric motor to power a drive mechanism of the infusion pump;
controlling a velocity output of the electric motor with the operational PWM commands that are generated as the electrical command input into the electric motor;
operating the drive mechanism of the infusion pump in response to the operational PWM commands;
comparing values of the operational PWM commands that are generated as the electrical command input into the electric motor while operating the drive mechanism to the threshold value of PWM commands; and
generating a missing cartridge indication if the values of the operational PWM commands drop below the threshold value by a predetermined amount.