Patent ID: 11951285
Assignee: ELI LILLY AND COMPANY
Field: Medical technology (Instruments)
Classification: CPC A | IPC A

Claim 30:
31. A method for determining completion of a dispensing event, the method comprising:
providing an injection device assembly, the assembly comprising:
a housing,
a syringe assembly at least partially disposed within the housing,
a drive mechanism configured to drive the syringe assembly from a storage position to an injection position to dispense medication,
one or more skin-contact sensors, each sensor being configured to detect contact with skin tissue, and
an accelerometer disposed within the device assembly and configured to output a signal representative of sensed acceleration;

analyzing the signal output by the accelerometer to detect a first acceleration spike and a second acceleration spike subsequent to the first acceleration spike; and
determining whether a dispensing event has been completed by:
determining that the dispensing event has been completed when a set of one or more conditions are satisfied, wherein the set of conditions comprise the following condition: at least one of the one or more skin-contact sensors detect contact with skin tissue at least once during a time period beginning with the first acceleration spike and ending with the second acceleration spike, and
determining that the dispensing event has not been completed when at least one condition in the set of conditions is not satisfied,
wherein analyzing the signal output by the accelerometer comprises:
calculating an integrated signal by integrating at least a portion of the signal output by the accelerometer, and
detecting an acceleration spike when the integrated signal is less than a maximum signal threshold.