Extracorporeal cell-based therapeutic devices and delivery systems are disclosed which provide a method for therapeutic delivery of biologically active molecules produced by living cells in response to a dynamic physiologic environment. Exemplary designs are disclosed. In a first exemplary embodiment the device includes long hollow fibers in which a layer of cells are grown within the intraluminal volume or within a double hollow-filled chamber. In another exemplary embodiment the device includes a wafer or a series of wafers forms a substrate onto which cells are grown. The wafer(s) are then inserted into a device. The devices are intended to be extracorporeal. Disclosed is a device for delivering a pre-selected molecule, for example, a hormone, into a mammal's systemic circulation. The device may also deliver a member of different cell products. The device comprises an anchoring element that can be anchored to an inner wall of an extracorporeal tube for blood. The device also comprises a capsule that is held in place within the extracorporeal tube for blood or fluid by an anchor. The device is adapted to secure viable cells which produce and secrete the pre-selected molecule into blood or fluid passing the capsule. The invention also provides a minimally invasive method for percutaneously introducing into a preselected blood vessel or body cavity the device of the invention.