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這些資料可以幫你詳細了解ALZET滲透泵
發布時間： 2021-07-21 點擊次數： 784次ALZET滲透泵是在片芯外包被一層聚合物構成的半透性衣膜，用激光在片劑衣膜層上開一個或多個適宜大小的釋藥小孔而制成。口服后，胃腸道內的水分通過半透膜進入片芯，因滲透壓活性物質使膜內溶液呈高滲，膜內外存在的滲透壓使水分繼續進入膜內，從而使藥物溶液或混懸的藥物從小孔泵出。常用的半透膜材料為醋酸纖維素。滲透壓活性物質起調節藥室內滲透壓的作用，其用量與零級釋藥時間長短有關，常用氯化鈉、乳糖、果糖、葡萄糖、甘露糖等。ALZET滲透泵控釋制劑主要由藥物、半透膜材料、滲透壓活性物質和推動劑組成。它的體積只有膠囊大小，可植入實驗動物皮下或腹腔內，直接或通過導管以µl/小時的速度持續準確地輸注測試藥劑。這種輸注根據所使用的泵，可以在動物清醒無束縛條件下長持續6個星期。ALZET滲透泵的使用優點：1、ALZET滲透泵型控釋片以滲透壓為驅動力，以零級釋放動力學為釋藥特征，能夠在一定的時間范圍內以恒定的釋藥速率釋放藥物，釋藥速率一般不受釋放介質pH、攪拌速度以及胃腸蠕動、食物等因素影響，能夠在較長時間內維持恒速釋藥，減少用藥頻率。2、體內外相關性較好，可避免普通口服制劑造成的血藥濃度波動較大的現象，提高用藥的安全性和有效性。
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