近年来,科研工作者对利用生物相容性聚合物来调节药物和兽药的释放速度很感兴趣。有几种系统用于延长药物的治疗作用和提高靶向性已取得成功并已上市。医药工业界开始逐渐认识这些系统的效益。扩散系统渗透膜这类系统中的药物贮库被包封在控速的聚合物膜中。贮库中包含药物颗粒或者药物颗粒在液相或固相介质中的溶液或分散液。聚合物膜可由均一或非均一的物质构成,而且可以是无孔、微孔或半透性的。药 In recent years, researchers are very interested in using biocompatible polymers to regulate the release rate of drugs and veterinary drugs. Several systems have been used to extend the therapeutic effect of drugs and to improve targeting and have been released. The pharmaceutical industry is beginning to recognize the benefits of these systems. Diffusion Systems Permeable Membranes Pharmaceutical systems in such systems are encapsulated in a controlled-velocity polymer membrane. The reservoir contains a solution or dispersion of drug particles or drug particles in a liquid or solid phase medium. The polymer film may be composed of a homogeneous or non-uniform substance, and may be non-porous, microporous or semi-permeable. medicine