Injection delivery device

An injection delivery device, comprising:

• a body, comprising an interior subassembly and an exterior subassembly;
• a medication-containing vial within at least a portion of the body, the vial having an open end and a closed end opposite the open end, wherein the open end of the vial includes a seal that prevents medication contained therein from exiting the vial until delivery of the medication to a target injection site is desired;
• wherein a side surface of the exterior subassembly includes at least one window therein;
• wherein a side surface of the interior subassembly includes at least one window therein corresponding to the at least one window of the exterior subassembly, so as to permit viewing of the vial from outside the exterior subassembly;
• a plunger positioned near the open end of the vial;
• a needle having a first end and a second end and a passage therethrough, the first end of the needle being usable for insertion into skin of a target injection site, and the second end of the needle being positioned to direct the medication from the vial into the passage for delivery to the target injection site via the first end;
• and
• wherein the needle, the plunger and the vial are all linearly coaxially aligned and positioned relative to each other such that, during delivery of an injection, a portion of the passage will be within the plunger, and the plunger and the needle will remain stationary relative to each other while the vial moves relative to the plunger in a direction towards the target injection site.