A parenteral delivery system for administering a beneficial parenteral agent formulation to an animal, the parenteral system comprising:
- (a) a primary reservoir comprising a parenterally administrable fluid;
- (b) a formulation chamber in communication with the primary reservoir, the formulation chamber comprising:
- (1) a wall comprising a composition impermeable to the passage of fluid, which wall surrounds an internal space;
- (2) an inlet in the wall adapted for receiving a tube for letting fluid from the primary reservoir into the formulation chamber;
- (3) an outlet in the wall adapted for receiving a tube for letting fluid the formulation chamber;
- (4) an agent delivery device in the formulation chamber, the delivery device comprising:
- (i) an inner mass transfer conductor;
- (ii) a beneficial agent formulation dispersed in the mass transfer conductor;
- and,
- (iii) a wall that surrounds the mass transfer conductor, the wall comprising a member selected from the group consisting of a diffusional composition and a microporous composition, which wall is a release rate controlling composition for the beneficial agent;
- (c) a secondary reservoir comprising a parenterally administrable fluid;
- (d) a formulation chamber in communication with the secondary reservoir, the formulation chamber comprising:
- (5) a wall comprising a composition impermeable to the passage of fluid which wall surrounds an internal space;
- (6) an inlet in the wall adapted for receiving a tube for letting fluid from the secondary reservoir into the formulation chamber;
- (7) an outlet in the wall adapted for receiving a tube for letting fluid leave the formulation chamber;
- (8) an agent delivery device in the formulation chamber, the delivery device comprising:
- (iv) an inner mass transfer conductor;
- (v) a beneficial agent dispersed in the mass transfer conductor;
- (vi) a wall that surrounds the mass transfer conductor, the wall comprising a member selected from the group consisting of a diffusional composition and a microporous composition, which wall is a release rate controlling composition for the beneficial agent;
- (e) a common path in communication with the primary reservoir and in communication with the secondary reservoir for administering the beneficial agent formulation to the animal;
- and,
- (f) wherein when the parenteral delivery system is in operation, the fluid flows in the system to the animal at a parenterally therapeutically acceptable rate.