Patent ID: 7771413

Claim:
A fluid medication delivery device, comprising: a first sheet constructed from a fluid impermeable material; a diffusion sheet constructed from a fluid semi-permeable material having a first surface and an opposing second surface; wherein: said diffusion sheet defines a substantially continuous, substantially homogeneous cross-section; said first surface of said diffusion sheet and said impermeable sheet cooperate to define a space therebetween, said space defining a fluid reservoir of said delivery device; and said first surface of said diffusion sheet and said first sheet are joined by a continuous seal therebetween to define a periphery of said fluid reservoir; and a boundary layer comprising a substantially impermeable member and an adhesive, the boundary layer being disposed on a peripheral portion of said second surface of said diffusion sheet; wherein: the boundary layer projects from said second surface so that an interior portion of said second surface of said diffusion sheet is not covered by the boundary layer; and the boundary layer is configured to substantially bound an interior region of said second surface, to permit said fluid medication delivery device to be secured to a patient, and to substantially inhibit a fluid from passing radially beyond said interior region.