Patent ID: 11944796
Assignee: SANOFI-AVENTIS DEUTSCHLAND GMBH
Field: Medical technology (Instruments)
Classification: CPC A | IPC A

Claim 0:
1. A medicament administration apparatus comprising
a housing;
a drug container;
a dose setting member allowing a user to set a medicament dose to be delivered, wherein the dose setting member is a dosage knob that does not rotate during a dose delivery;
a release member moveable in a distal direction to permit the dose delivery;
an indicator adapted to rotate relative to the housing during the dose delivery, wherein an amount of rotation of the indicator indicates a delivered medicament dose; and
a sensor arrangement comprising:
a sensor adapted to measure the amount of rotation of the indicator, wherein the sensor is permitted to move axially together with the indicator; and
a processor configured to determine an amount of medicament expelled by the medication administration apparatus based on the amount of rotation that the sensor measured,

wherein the sensor is a magnetic sensor,
wherein the indicator comprises plural magnets, the plural magnets being provided around a circumference of a surface of the indicator, and
wherein the magnetic sensor varies its output due to variations in a magnetic field as the indicator and the plural magnets rotate relative to the housing.