Auto-injection device

An auto-injector device, elongated along a longitudinal axis and having a proximal end and an opposing distal end, the device comprising

• a syringe having a substantially circular cross section with an outer diameter, a proximal end, a neck, a distal end with a flange radially extending from an outer periphery of a container, a movable plunger, a needle, and a tubular needle shield having an outer diameter that is larger than the outer diameter of the syringe;
• an elongated auto-injector housing, comprising a space for the syringe;
• and
• a syringe holder having a syringe holder wall with a substantially tubular shape, the syringe holder wall having:
• an open distal end with a distal supporting collar arranged around an outer periphery of the syringe holder wall to support the syringe by the flange,
• an open proximal end with a proximal supporting collar arranged around an inner periphery of the syringe holder wall to support the syringe neck, wherein the proximal supporting collar is configured to flex radially outward to allow the tubular needle shield to pass through when the syringe is longitudinally mounted in the syringe holder, and
• a slot extending from the open proximal end in a distal direction, resulting in a C-shaped cross sectional shape of the syringe holder wall in the proximal end;
• wherein the outer periphery of the proximal end of the syringe holder is radially supported by at least one contact surface of the auto-injector housing when the syringe holder is in a proximal and secured position within the auto-injector housing, and wherein the auto-injector housing prevents the proximal supporting collar from flexing radially outward when the syringe holder is in the proximal and secured position within the auto-injector housing, thereby restraining the syringe within the syringe holder.