申请人:CASTEX PRODUCTS LIMITED
公开号:EP0164927A2
公开(公告)日:1985-12-18
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, Figure 14) or in a developed embodiment may comprise a succession of annular segments (269, Figure 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 Figure 25, the device may incorporate a weight (275) which, in animal use, inhabits 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).
用于向液体环境(如水库或湖泊的水)中投放生物活性物质(如杀虫剂)或向动物瘤胃汁液中投放驱虫药的栓剂包括一系列不透液的外层片段(153、在最简单的情况下,它可以是一个单一的活性材料段(151,图 14),或者在一个已开发的实施例中,它可以包括一系列环形段(269,图 25),这些环形段包含在外段(263)的密封凹槽(267)中,这些密封凹槽位于一个可降解的中心杆(265)上,例如镁合金。中心杆(265)由镁合金等材料制成,其本身具有活性,例如可用于防治镁缺乏症。
如图 25 所示,该装置可包括一个砝码 (275),在动物使用时,该砝码可防止反流。此外,该装置还可包括一个电偶元件,它与杆 (265) 一起产生电偶作用,从而控制杆 (265) 的降解速度,进而控制片段 (26) 的给药速度。