ZnO--SeO.sub.2 --R.sub.2 O soluble glass
AssigneeInternational Standard Electric Corporation
InventorCyril F. Drake
Life of this patent
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Abstract
A subcutaneous implant for supplying one or more trace elements to an animal. The implant is made from a zinc oxide based glass which is prepared in rod form, a short section of the rod being implanted under the skin of an animal. Typically the glass may contain selenium dioxide for supplying small quantities of selenium to the animal.
Claims6
A water soluble glass composition adapted to release trace amounts of selenium into an aqueous solution, the composition including a fused mixture of 40 to 60 mol % selenium dioxide (SeO.sub.2) as a glass-forming oxide and 35 to 60 mol % zinc oxide (ZnO) as a glass-modifying oxide as its major constituents and at least one alkali metal oxide as a minor constituent for modifying the selenium release rate, wherein the alkali metal oxide molar concentration is at least as low as 13.1%.
A water soluble glass composition adapted to release trace amounts of selenium into an aqueous solution, the composition including a fused mixture of selenium dioxide (SeO.sub.2) as a glass-forming oxide and zinc oxide (ZnO) as a glass-modifying oxide as its major constituents and at least one alkali metal oxide as a minor constituent for modifying the selenium release rate, wherein the molar composition of said glass composition is substantially xM.sub.2 O:(50-x)ZnO:50SeO.sub.2, M.sub.2 O is the alkali metal oxide content and the value of x is between 5 and 18.
Dependencies are inferred from the claim text.