Abstract: A unit dose dispenser for dispensing a composition includes a compressible, air filled container in communication with an open end of a tube filled with the composition. The opposite end of the tube through which the composition is dispensed is sealed with a removable closure cap to maintain sterility of the composition prior to use. By removing the cap and applying external pressure to compress the container, air is forced to enter the tube and eject, by displacement, composition from the tube. To completely eject the predetermined dosage that completely fills the tube, the volume of air or other gaseous propellant within the compressible container is greater than the volume of the unit dose.

Abstract: A dispensing device includes a hollow cylindrical body from which a high viscosity composition is discharged in precisely metered doses by means of a plunger rod longitudinally movable within the body. The plunger rod includes a series of thread segments formed at equispaced, angular intervals from each other to establish an exterior thread of constant pitch in threaded engagement with the body. Each segment has an abutment surface projecting from the surface of the plunger. By depressing a trigger mounted on the body into contact with an abutment surface aligned therewith, the plunger rotates through the angular interval and thereby advances through the body to expel a desired amount of composition. Disengagement of the trigger with the abutment surface automatically occurs as the abutment surface rotates to the end of the angular interval, out of contact with the trigger, causing the next in-line abutment surface to be indexed into alignment with the trigger to allow for successive doses.

Abstract: A dispensing device including a hollow cylindrical body from which a high viscosity composition is discharged in precisely metered doses by a plunger rod longitudinally movable within the body. A series of projection are formed at equispaced, longitudinal intervals from each other on the plunger rod. A pair of parallel actuating arms pivotally mounted on the body extend along opposite side of the plunger rod and are formed with a pair of teeth, respectively, projecting inward toward the rod. By depressing the arms, the teeth pivot into engagement with one of the projections to advance the plunger within the body to expel a desired amount of composition. In a preferred embodiment, advancement of the plunger rod through a precise distance is automatically controlled via contact between the teeth with stop surfaces formed on the next in-line projection.