Patent ID: 6153213
Filing Date: 2000-11-28
Classification: A61K

Abstract:
A bolus for supplying a beneficial substance to a ruminant animal, comprising:an elongate outer container, in use, having an exit orifice at its first end;a ballooning component of elastic material within said elongate outer container, said balloon-shaped component having a mouth closing a second end of said elongate outer container;a material capable of swelling by absorption of water filling said ballooning component;a filter closing the mouth of said ballooning component, said filter being permeable to water and impermeable to said material filling said ballooning component; and,a beneficial substance filling said elongate outer container outside said ballooning component, so that, when in use, said ballooning component expands by absorption of water from an animal rumen through said filter into said swellable material, thereby expanding said ballooning component and expelling said beneficial substance through said exit orifice of said elongate outer container until said ballooning component substantially fills said elongate outer container.