A system and method for a patch-like, self-contained substance infusion device(700) which can be attached to a skin surface via an adhesive contact surface.A pushbutton (780) activation assembly can then be used to remove an interlock(730), allowing adisk or Belleville spring (735) assembly to apply an essentially even andconstant pressureto the contents of a fluid reservoir assembly (710). This allows the releaseof one or morespring-loaded patient needles (760) into the skin surface, and establishes afluidcommunication path between the patient needles (760) and the pressurized fluidreservoircontents thereby delivering an infusion into the skin. The push button (780)activationassembly further allows the release of one or more improved safety mechanisms(794) afteruse.
