Automatic injector devices and systems for controlled delivery of dosage and associated methods

An injector assembly for automatically delivering a dose of a liquid medicament in a controlled manner, comprising:

• a dose module comprising a cartridge housing a hypodermic syringe, wherein the hypodermic syringe contains the dose of the liquid medicament, and wherein the hypodermic syringe is coupled to a hypodermic needle;
• an injector having an internal cavity for receiving the cartridge, the injector comprising:
• a motor configured to move the hypodermic needle from a retracted position to an extended position;
• a power source;
• a controller in communication with the power source and a plurality of sensors, the controller having instruction for causing the injector to:
• receive input from the plurality of sensors to define one or more injection parameters, and
• calculate an injection force for delivering the dose of the liquid medicament in a controlled manner, wherein calculating the injection force comprises calculating a viscosity of the liquid medicament using at least a rheology program stored in a memory of the injector assembly, and wherein the rheology program is specific to the liquid medicament.