Abstract: An ambulatory medication delivery system includes an ambulatory pump unit having a computer control linear motor pump for pumping predetermined volumes of fluid in accordance with a programmed delivery schedule which may be altered through communication with a remote monitoring location via a telephone data access line or via radio frequency communication. A clinician communication unit and a patient communication unit receive and send information to the ambulatory pump unit and also communicate via a telephone data modem access to the computer at a remote monitoring location at which trained health personnel can monitor a number of patient locations and alter or change medication delivery profiles as required.

Abstract: An electromagnetic linear motor having a variable length stroke and providing a substantially large force in both its power stroke and return stroke includes concentric inner and outer magnetic circuits arranged coaxially for movement relative to one another in a rectilinear path with reciprocating motion in response to the interaction of magnetic fields produced by the inner and outer magnetic circuits, respectively. The length of the stroke and the rate of reciprocation are directly proportional to the magnitude of the voltage used to excite primary and secondary coils which generate the respective magnetic fields and the rate at which the polarity of the voltage applied to the secondary coil is changed between negative and positive polarities.