Auto-injector

An auto-injector for receiving and operating a syringe, the auto-injector comprising:

• a housing for receiving the syringe, the housing comprising a main body and a door operable into a first position and a second position, wherein the syringe is receivable within the housing when the door is in the first position;
• wherein the door is configured to couple to:
• (i) a first plunger driver for priming thereof on a first movement of the door, the first plunger driver comprising a first spring;
• and
• (ii) a second plunger driver for priming thereof on a second movement of the door, the second plunger driver comprising a second spring;
• the first and second plunger drivers being configured on activation of the auto-injector to drive a plunger forward within the auto-injector to operate the syringe received within the auto-injector, and
• a ratchet operable during the second movement of the door to prevent movement of the door in the direction of the first position by a force exerted by a second plunger driver,
• wherein the first position of the door is an open position,
• wherein the second position of the door is a closed position,
• wherein the first movement of the door is an opening movement, and
• wherein the second movement of the door is a closing movement.