  Mathematical equations can be used as effectual tools in drug delivery
systems modeling and are also highly helpful to have a theoretical
understanding of controlled drug release and diffusion mechanisms. In this
study we aim to present a mathematical combination between the Bernoulli
equation and the Fick's equation as a diffusion controller in drug delivery
systems. For this propose we have revised the Bernoulli equation as an
additional, controller and complementary method of the Fick's diffusion
equation to detect the optimal delivery direction to control the diffusion
divergence of the drug carrier in vascular systems during the transportation
process in biological tissues. Therefore, by utilizing the Bernoulli equation
we could determine the real direction by the route function f.
