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

Claim 19:
20. An injection device 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;
an accelerometer disposed within the housing and configured to output a signal representative of sensed acceleration; and
a processing circuit operably coupled with the one or more skin-contact sensors and the accelerometer configured to:
analyze the signal output by the accelerometer to detect a first acceleration spike and a second acceleration spike subsequent to the first acceleration spike,
determine that a dispensing event has been completed when a set of one or more conditions are satisfied, wherein the set of conditions comprises 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
determine that the dispensing event has not been completed when at least one condition in the set of conditions is not satisfied,
wherein the processing circuit is configured to analyze the signal output by the accelerometer to detect acceleration spikes by:
calculating an integrated signal by integrating at least a portion of the signal, and
detecting the first acceleration spike or the second acceleration spike when the integrated signal is less than a maximum signal threshold.