Patent ID: 11931557
Assignee: SANOFI
Field: Medical technology (Instruments)
Classification: CPC A | IPC A

Claim 17:
18. A method of determining a dosage of a medicament dispensed from a medicament delivery device by using a medicament delivery system, wherein the medicament delivery system comprises:
the medicament delivery device, wherein the medicament delivery device comprises:
a medicament reservoir,
a lead screw, and
a drive sleeve that is rotatable to axially displace the lead screw relative to the drive sleeve to dispense the medicament from the medicament reservoir, wherein the drive sleeve is prevented from rotating during dose setting, and

a dosage measurement system comprising:
a sensor unit configured to measure a rotation of at least one of the drive sleeve and the lead screw of the medicament delivery device, wherein the sensor unit is further configured to be at least partially located within the drive sleeve of the medicament delivery device, and
a processor configured to determine a dosage dispensed from the medicament reservoir of the medicament delivery device based on a measured rotation of at least one of the drive sleeve and the lead screw,

and wherein the method comprises:
measuring a rotation of at least one of the drive sleeve and the lead screw of the medicament delivery device while the medicament is dispensed from the medicament reservoir; and
determining the dosage dispensed from the medicament reservoir based on the rotation measured of at least one of the drive sleeve and the lead screw.