Autoinjector air removal apparatus and method of removing air from an autoinjector

An autoinjector comprising:

• a first chamber configured to hold a substance, the first chamber including a base;
• a second chamber coupled to the first chamber, the second chamber being defined by the base of the first chamber, a first wall, and a plunger, wherein the second chamber is configured to increase in volume in response to the plunger moving away from the base of the first chamber;
• and
• a hole disposed through the base of the first chamber such that the hole is in fluid communication with the first chamber and the second chamber,
• wherein the first wall has a gas-permeable portion, and
• wherein increasing the volume of the second chamber draws the substance from the first chamber into the second chamber and expels a gas out of the second chamber and through the gas-permeable portion, wherein the autoinjector further comprises an arm including a first end and a second end opposite the first end, the arm being coupled to the first chamber at the first end and the second chamber at the second end such that the arm forms an airtight seal between the arm and the first chamber and the second chamber, the arm being configured to move with the plunger.