Patent ID: 11865312
Assignee: SANOFI
Field: Medical technology (Instruments)
Classification: CPC A | IPC A

Claim 0:
1. A dose tracking mechanism for use in a drug delivery device, the dose tracking mechanism comprising:
a housing;
a moveable component configured to move with respect to the housing during operation of the drug delivery device; and
an RFID device comprising:
an electric circuit having a resonance frequency, the electric circuit comprising:
an antenna configured to transmit a wireless RFID signal at the resonance frequency, and
an electrical component operatively coupled to the moveable component and configured to modify the resonance frequency based on a position of the moveable component, such that the resonance frequency of the electric circuit is an indication of the position of the moveable component,

wherein the moveable component is configured to vary an electrical property of the electrical component as a function of the position of the moveable component, wherein the resonance frequency of the RFID device is a function of the electrical property, wherein the electrical property is one or more of the following: capacitance, inductance, or resistance, and
wherein the resonance frequency is an indication of at least one of: a set dose of medicament, a dispensed dose of medicament, or a total dose of medicament remaining in the drug delivery device.