Auto injector with reconstitution handling support

An auto injector for administering a medicament, the auto injector comprising:

• a housing;
• a cartridge receiver configured to receive a cartridge assembly comprising a cartridge and a cartridge code feature, the cartridge comprising a first stopper and a cartridge compartment containing the medicament, the cartridge compartment having a first cartridge subcompartment containing a first medicament component of the medicament and a second cartridge subcompartment containing a second medicament component of the medicament, wherein the cartridge code feature is indicative of an amount of movement energy needed for optimal mixing of the first medicament component and the second medicament component;
• a code sensor configured to read the cartridge code feature;
• an orientation sensor configured to detect an orientation of the cartridge or an orientation of the auto injector or both;
• a drive module coupled to move a plunger rod between a retracted plunger rod position and an extended plunger rod position, the plunger rod being configured to move the first stopper;
• a processing unit coupled to the drive module, the orientation sensor and the code sensor, wherein the processing unit is configured to:
• control the drive module to move the plunger rod from a first plunger rod position to a mix plunger rod position with a mix plunger rod speed, wherein the mix plunger rod position is selected to position the first stopper in a position wherein the first medicament component is mixed with the second medicament component;
• receive an orientation signal;
• receive from the code sensor a code signal indicative of the cartridge code feature;
• determine a first movement parameter, wherein the first movement parameter is indicative of a frequency of movement of the auto injector;
• wherein the first movement parameter is based on a cumulative measure of the orientation signal over time;
• and
• control the drive module to move the plunger rod from the mixed plunger rod position to a second plunger rod position when receiving an onset signal, wherein the onset signal is indicative that the first medicament component and the second medicament component has been reconstituted.