| 摘要 |
A device for the slow release of chemicals into the body of an animal when the device is positioned in a body cavity of that animal, is formed as a flexible core member (1) from polypropylene, polyethylene or other polymer in a shape having a plurality of lobes (4,8) one (4) of which is longer than other shorter lobes (8) and the shorter lobes (8) being foldable for insertion and removal purposes. The core (1) has a solid (3) secured to the surface thereof or forming a part of the surface thereof which solid of silicone rubber or ethylene vinyl acetate or other suitable polymer is impregnated with one or more chemicals which in use are leached therefrom by body fluids. A withdrawal ligament (14) is attached to the free end of the longer lobe.
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