Abstract: An injection amount measuring apparatus for a syringe indicated with injection amount absolute value information is provided. The injection amount measuring apparatus includes an injection amount absolute value information extracting unit configured to extract the injection amount absolute value information; a control unit configured to analyze the extracted injection amount absolute value information to determine injection amount information for an injection amount to be injected from the syringe; and a storage unit configured to store the injection amount information.

Abstract: A dose measuring device for a drug delivery device is provided. The dose measuring device includes a main body and a dial sleeve coupled to the main body to spirally move, the dose measuring device including a housing provided to be removable from the main body, a rotation ring received in the housing to rotate, an encoder installed in the housing to detect the amount of rotation of the rotation ring, and an auxiliary sleeve provided to be removable from the dial sleeve and to spirally move together with the dial sleeve in the housing, in which the rotation ring is bound to the auxiliary sleeve to rotate together with the auxiliary sleeve and is fixed in the housing in a longitudinal direction of the main body.

Abstract: An injection amount measuring apparatus for a syringe indicated with injection amount absolute value information is provided. The injection amount measuring apparatus includes an injection amount absolute value information extracting unit configured to extract the injection amount absolute value information; a control unit configured to analyze the extracted injection amount absolute value information to determine injection amount information for an injection amount to be injected from the syringe; and a storage unit configured to store the injection amount information.