Fluid medication delivery device

A fluid medication delivery device, comprising:

• a fluid impermeable sheet;
• a diffusion sheet having a first surface and an opposing second surface, said diffusion sheet defining a generally continuous and generally homogenous cross-section across an entirety of an external surface of the opposing second surface, said first surface of said diffusion sheet and said impermeable sheet cooperating to define a space therebetween, said space defining a fluid reservoir of said delivery device, said first surface of said diffusion sheet and said impermeable sheet having a continuous seal therebetween to define a periphery of said fluid reservoir;
• and
• a boundary layer comprising a substantially impermeable member and an adhesive disposed generally flush with said second surface of said semi-permeable layer to substantially bound an interior region of said second surface, said boundary layer configured to permit said fluid medication delivery device to be secured to a patient, and substantially inhibit a fluid from passing radially beyond said interior region.