Patent ID: 9555225
Date: 2017-01-31
CPC Classifications: A61D,A61J,A61K,A61M

Claim:
1. A sustained release capsule comprising a hollow tubular body sealed at a first end, a movable piston within the body, a spring biasing the piston towards a second end of the body, an apertured cover at the second end to define a first chamber between the movable piston and the apertured cover capable of containing a first dose of material within the hollow tubular body for subsequent sustained release through the apertured cover into a rumen of an animal; wherein an overcap is releasably attached to the device at one end thereof to form a void between an end of the device and the overcap capable of containing a second dose of material within the void so that in use the second dose of material is delivered to the rumen when the overcap is breached or detaches from the device; wherein the capsule contains the second dose of material as a dump dose within the overcap, and the first dose of material as a sustained release dose within the body of the capsule; and wherein the movable piston has an end face facing towards the first dose, a hollow central sleeve extending rearwardly from the end face to assist in locating a spring, an aperture in the end face into the hollow interior of the central sleeve, the central sleeve having a closed portion distal from the end face to create a void capable of containing an exit dose of material.