Parenteral administration using osmotically motivated delivery system

Claim 1

A parenteral delivery set for administering a beneficial agent formulation to a warm-blooded animal, the delivery set comprising: (a) a primary tube for the flow of a parenterally acceptable fluid therethrough; (b) a secondary tube for the flow of a parenterally acceptable fluid therethrough; (c) a formulation chamber having means for establishing communication with the secondary tube, the formulation chamber comprising: (1) a wall that surrounds an internal lumen; (2) an inlet in the wall for letting a parenterally acceptable fluid enter the formulation chamber; (3) a beneficial agent osmotic delivery device in the formulation chamber, the delivery device comprising: (i) a wall formed of a semipermeable composition that surrounds and forms a compartment, (ii) a beneficial agent in the compartment, and (iii) a passageway in the wall of the delivery device connecting the compartment with the formulation chamber; (4) an outlet in the wall for letting an agent formulation leave the formulation chamber; (d) a common tube having means for communicating with the primary tube for receiving parenterally acceptable fluid from the primary tube, and for communicating with the secondary tube for receiving parenterally administrable agent formulation from the secondary tube.