Self-controllable load spring washer

A medical injection device comprising:

• a housing having a proximal end, a distal end, and sidewall therebetween defining an interior;
• a brake member received within the interior of the housing;
• a cartridge holder received within the interior of the housing, distal of the brake member;
• a cartridge received within the cartridge holder and holding a composition therein;
• a load spring washer comprised of an elastomeric material and comprising:
• a main body comprising a plurality of concentric rings with a gap therebetween, at least one of the plurality of concentric rings having a diameter smaller than another of the plurality of concentric rings and each of the plurality of concentric rings having a proximal surface and a distal surface;
• and
• one or more protrusions extending proximally away from the proximal surface of the main body, one of at least one of the plurality of concentric rings, the load spring washer received within the interior of the housing and positioned between the brake member and the cartridge holder such that, when the medical injection device is assembled, the one or more protrusions abuts the brake member and the distal surface abuts the cartridge and/or the cartridge holder;
• an injection needle in fluid communication with the cartridge and arranged at a distal end of the housing;
• and
• an actuation member arranged at the proximal end of the housing, the actuation member configured to actuate the medical injection device to deliver the composition through the injection needle.