Auto-injector device

An auto-injector device for delivering a liquid medicament, comprising:

• an injector body having a proximal end and a distal end;
• a syringe received in the injector body;
• a needle disposed in a first end of the syringe to extend toward an opening in the distal end of the injector body;
• and
• a sealing element disposed at the distal end of the injector body, the sealing element configured to form a seal against a patient's skin and thereby define a closed volume within the injector body in use,
• wherein the auto-injector is configured to generate a reduced pressure within the closed volume to draw the auto-injector device against the patient's skin, and wherein the auto-injector device comprises a pressure reducing mechanism configured to generate the reduced pressure within the injector body during an injection process, the pressure reducing mechanism comprising a moveable member which is moveable in a longitudinal direction of the injector body from a first position in a direction towards the proximal end of the injector body to a second position and which is configured such that movement of the moveable member from the first position to the second position enlarges the closed volume within the injector body to generate the reduced pressure within the closed volume, and wherein the pressure-reducing mechanism includes a biasing element configured to bias the moveable member into the second position.