Release device
US4642230A · kind A · utility
Assignees
Inventors
Key dates
| Filing date | May 21, 1985 |
| Grant date | Feb 10, 1987 |
| Priority date | — |
| Expiry date | May 21, 2005 |
Classification
- Technology area (CPC A)Human Necessities
- CPC primaryA61M31/002
- WIPO fieldPharmaceuticals
- WIPO sectorChemistry
Abstract
A bolus for administering a biologically active material for example an insecticide into a liquid environment such as the water of a reservoir or lake or an anthelmintic into the rumen juices of an animal comprises a succession of liquid impermeable outer segments (153, 263) enclosing a core which in the simplest case may be a single unitary active material segment (151, FIG. 14) or in a developed embodiment may comprise a succession of annular segments (269, FIG. 25) contained in sealed recesses (267) in the outer segments (263) which are located on a degradable central rod (265) e.g. of magnesium alloy, which itself will be active for instance to combat magnesium deficiency. As shown in FIG. 25, the device may incorporate a weight (275) which, in animal use, inhibits regurgitation. Additionally, the device may include a galvanic couple element which, with the rod (265) sets up a galvanic action which controls the speed of degradation of the rod (265) and thereby the rate of administration of the segments (26).
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.