Surgery – Controlled release therapeutic device or system
Patent
1987-04-17
1989-09-05
Lusignan, Michael
Surgery
Controlled release therapeutic device or system
604 93, 424438, A61M 3100
Patent
active
048634557
ABSTRACT:
A pellet for administration to ruminants to supply magnesium and other biologically active material, for example, anthelmintics or antibiotics comprises a tube of magnesium alloy 1 enclosing a core or filling 3. The core 3 typically comprises mainly iron shot as weighting material, a biologically active material if desired and an electrically conductive material such as carbon or graphite. The graphite ensures that the core 3 as a whole is conductive and provides a cathode electrically coupled with the magnesium alloy tube 1 to form a galvanic cell. Liquor in the rumen serves as an electrolyte to cause galvanic corrosion of the magnesium tube 1 to release the active material contained in the core 3. A protective coating 5 of resin is provided on the tube's exterior surface except on at least one end 4 so that the corrosion is limited to the exposed surfaces only. An alternative embodiment (FIG. 4) comprises a control magnesium alloy rod or shaft 11 around which a cylinder 13 of the electrically conductive component is pressed. The cylinder contain iron shot and graphite in similar proportions to the core 3 in the first embodiment and is also provided with a protective resin coating 12 to restrict corrosion to one or both ends of the rod 11.
REFERENCES:
patent: 4623345 (1986-11-01), Laby
Castex Products Limited
Lusignan Michael
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