申请人:Lowe Barry Lionel
公开号:US20050064032A1
公开(公告)日:2005-03-24
The present invention relates to a controlled dosage release element adapted to be inserted into and retained in the rumen of a ruminant animal. The element comprises: a) one or more discrete and predetermined amounts of at least a first formulation comprising at least a first active agent, the formulation being adapted to dissolve in rumen fluids at a rate such that dissolution of each of the one or more amounts of first formulation provides a short or pulsed episode of release of the first active agent into the rumen; and b) one or more predetermined amounts of at least a second formulation adapted to dissolve at a controlled rate in rumen fluids; wherein the one or more amounts of first formulation are provided at one or more predetermined locations within the element relative to said one or more amounts of second formulation for one or more delayed releases of at least the first active agent into the rumen at predetermined times before, during, after, or any combination thereof, of a predetermined extended time period defined by said second formulation. The invention also relates to a method for delivering at least a first active agent to the rumen of a ruminant animal in a delayed manner at one or more predetermined times after administration to the animal of a composition containing the active agent, the method comprising administering to the animal a controlled dosage release element according to the invention. The first active agent will typically be for the treatment, prophylaxis or both of a diseased or infested state in a ruminant animal, or for altering the physiological status of a ruminant animal.
本发明涉及一种可插入反刍动物瘤胃并保留在其中的控释元件。该元件包括a) 一种或多种离散和预定量的至少包含第一种活性剂的第一制剂,该制剂在瘤胃液中的溶解速率使第一制剂的每一种或多种量的溶解都能将第一种活性剂短时间或脉冲式地释放到瘤胃中;以及 b) 一种或多种预定量的至少包含第二种制剂的制剂,该制剂在瘤胃液中的溶解速率受控;其中,相对于所述一个或多个量的第二制剂,在元件内的一个或多个预定位置提供一个或多个量的第一制剂,以便在所述第二制剂确定的预定延长时间段之前、期间、之后或其任意组合的预定时间段内,将至少第一活性剂延迟释放到瘤胃中。本发明还涉及一种方法,用于在向反刍动物施用含有活性剂的组合物后,在一个或多个预定时间内,以延迟的方式将至少第一种活性剂输送到反刍动物的瘤胃中,该方法包括向动物施用根据本发明的控释剂。第一种活性剂通常用于治疗、预防或治疗反刍动物的疾病或感染状态,或用于改变反刍动物的生理状态。