A system and method for a patch-like, self-contained substance infusion
device which provides one or more substantially hidden patient needles
which can be placed in fluid communication with a fluid reservoir
subassembly that includes a rigid bladder portion used in conjunction
with a non-distensible bladder film, such as a metallized film. Simple
removal of an interlock allows a disk, or Belleville spring assembly to
apply an essentially even and constant pressure to the contents of the
fluid reservoir assembly, and allows the device to then be attached to a
skin surface via an adhesive contact surface. A push button activation
assembly is provided which can then be used to release and seat one or
more spring-loaded patient needles into the skin surface, and establish a
fluid communication path between the patient needles and the pressurized
fluid reservoir contents thereby delivering an infusion into the skin.