Injection device and components thereof

An injection device comprising:

• an injection drive assembly, wherein the injection drive assembly comprises:
• a pneumatic piston chamber;
• a dose chamber;
• a pneumatic piston slidably positioned in the pneumatic piston chamber;
• and
• an injectate piston slidably positioned in the dose chamber;
• wherein the injection drive assembly comprises only one pneumatic piston slidably positioned in the pneumatic piston chamber;
• wherein the injection drive assembly is movable between a pre-injection position and a post-injection position;
• and
• wherein the injection drive assembly is configured so that any energy resulting from an application of force to the injection drive assembly is instantaneously available for an initiation of an injection cycle.

An injection device comprising:

• an injection drive assembly, wherein the injection drive assembly comprises:
• a pneumatic piston chamber;
• a dose chamber;
• a pneumatic piston slidably positioned in the pneumatic piston chamber;
• and
• an injectate piston slidably positioned in the dose chamber;
• wherein the injection drive assembly is movable between a pre-injection position and a post-injection position;
• wherein the injection drive assembly is configured so that any energy resulting from an application of force to the injection drive assembly is instantaneously available for an initiation of an injection cycle;
• wherein the pneumatic piston and the injectate piston are not directly or indirectly attached to one another;
• wherein when the injection drive assembly is in the pre-injection position, the pneumatic piston and the injectate piston are spaced apart from one another;
• and
• wherein the pneumatic piston is configured to contact the injectate piston when the pneumatic piston moves from the pre-injection position to the post-injection position.