申请人:Merck & Co., Inc.
公开号:EP0169105A2
公开(公告)日:1986-01-22
(57) The instant invention is directed to an osmotic pump comprising:
(a) at least one active agent surrounded by
(b) a water insoluble wall, having a fluid permeability of 6.96 x 10-18 to 6.96 x 10-14cm3 sec/g and a reflection coefficient of less than 1, prepared from:
(i) a polymer permeable to water but impermeable to solute, and
(ii) 0.1 to 60% by weight, based on the total weight of (i) and (ii), of at least one pH insensitive pore forming additive dispersed throughout said wall.
(57) 本发明涉及一种渗透泵,包括:(a)至少一种活性剂,由(b)不溶于水的壁包围,其流体渗透性为6.96×10-18至6. 96 x 10-14cm3 sec/g,反射系数小于 1,由以下材料制备:(i)可渗透水但不渗透溶质的聚合物,和(ii)以(i)和(ii)的总重量为基准,按重量计为 0.1 至 60%,分散在所述壁中的至少一种对 pH 值不敏感的形成孔隙的添加剂。