Transmission of data associated with an injection device usage using passive rf modulation

A medicament injection system comprising:

• an external device comprising:
• a transmitter configured to generate an interrogation signal,
• a receiver configured to receive a radio frequency (RF) signal, and
• one or more processors configured to process the RF signal and to generate result data to be displayed by the external device;
• and
• an injection device comprising:
• a reservoir comprising a wall defining a proximal end, a distal end and a tubular side,
• a plunger rod configured to be movable within the reservoir in a direction from the distal end to the proximal end,
• a radio frequency (RF) antenna attached to the tubular side and configured to receive an interrogation signal from an external device, and
• a resonating assembly configured to receive the interrogation signal from the RF antenna and to generate a modulated RF signal in response to the interrogation signal, the RF signal having a frequency associated with a position of the plunger rod,
• wherein the interrogation signal comprises a plurality of interrogation signals received at regular time intervals, and
• wherein, in response to receiving the plurality of interrogation signals, the resonating assembly generates a plurality of RF signals, such that a frequency shift between two of the plurality of RF signals is associated with an amount of medicament within the reservoir.

An injection device comprising:

• a reservoir comprising a wall defining a proximal end, a distal end and a tubular side;
• a plunger rod configured to be movable within the reservoir in a direction from the distal end to the proximal end;
• a radio frequency (RF) antenna attached to the tubular side and configured to receive an interrogation signal from an external device;
• and
• a resonating assembly configured to receive the interrogation signal from the RF antenna and to generate a modulated RF signal in response to the interrogation signal, the RF signal having a frequency associated with a position of the plunger rod.

A medicament injection system comprising:

• an external device comprising:
• a transmitter configured to generate an interrogation signal,
• a receiver configured to receive a radio frequency (RF) signal, and
• one or more processors configured to process the RF signal and to generate result data to be displayed by the external device;
• and
• an injection device comprising:
• a reservoir comprising a wall defining a proximal end, a distal end and a tubular side,
• a plunger rod configured to be movable within the reservoir in a direction from the distal end to the proximal end,
• a radio frequency (RF) antenna attached to the tubular side and configured to receive an interrogation signal from an external device, and
• a resonating assembly configured to receive the interrogation signal from the RF antenna and to generate a modulated RF signal in response to the interrogation signal, the RF signal having a frequency associated with a position of the plunger rod.