申请人:S R I International
公开号:US04764364A1
公开(公告)日:1988-08-16
Biodegradible polymers are provided which may contain a biologically active substance, e.g. a drug such as insulin, which is released over a period of time as the polymer erodes when in contact with a body fluid. The polymer contains an amine functionality whereby it erodes faster at low acid pH's than at higher acid pH's. As an example, the polymer may contain insulin and may contain or may have an encapsulating hydrogel containing glucose oxidase. As the blood sugar level of a diabetic person rises, e.g., afte a meal, glucose diffuses into the polymer or hydrogel and is converted to gluconic acid which lowers the pH, and accelerates erosion and the release of insulin.
提供可降解聚合物,其中可能含有生物活性物质,例如胰岛素等药物,当与体液接触时,随着聚合物的侵蚀,这些物质会在一段时间内释放出来。该聚合物含有胺基官能团,使其在低酸性pH值下比在较高酸性pH值下侵蚀更快。举例来说,聚合物可能含有胰岛素,也可能含有或包含葡萄糖氧化酶的包埋水凝胶。当糖尿病患者的血糖水平升高,例如饭后,葡萄糖扩散到聚合物或水凝胶中,转化为葡萄糖酸,降低pH值,加速侵蚀和释放胰岛素。