The invention relates to a parenteral therapeutic agent delivery device. The therapeutic agent delivery device has a disposable section and an implant section suitable for long term implantation within the tissue of a subject. When necessary, the disposable section can be detached from the implant section, and a new disposable section can be attached. The disposable section may contain a reservoir containing the therapeutic agent, a pump for dispensing the therapeutic agent, controlling circuitry for regulating the dispensing of the therapeutic agent, and transceiver circuitry and an antenna for wireless communication with external devices.
