{HEAD ~ Fluid} from {TAIL ~ the environment} is imbibed through a semipermeable plug into the water swellable agent chamber and the active agent formulation is released through a back diffusion regulating outlet 
from
{ HEAD ~ Fluid } from { TAIL ~ the environment } is imbibed through a semipermeable plug into the water swellable agent chamber and the active agent formulation is released through a back diffusion regulating outlet
HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH