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關(guān)于ALZET滲透泵的使用優(yōu)點和特點，以下有詳細(xì)說明
發(fā)布時間： 2021-11-20 點擊次數(shù)： 1463次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(zhì)和推動劑組成。ALZET滲透泵是在片芯外包被一層聚合物構(gòu)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(nèi)的水分通過半透膜進入片芯，因滲透壓活性物質(zhì)使膜內(nèi)溶液呈高滲，膜內(nèi)外存在的滲透壓使水分繼續(xù)進入膜內(nèi)，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(zhì)起調(diào)節(jié)藥室內(nèi)滲透壓的作用，其用量與零級釋藥時間長短有關(guān)，常用氯化鈉、乳糖、果糖、葡萄糖、甘露糖等。推動劑能吸水膨脹，將藥物層的藥物推出釋藥小孔，常用高分子量聚乙二醇等。除上述組成，滲透泵片中還可以加入助懸劑、黏合劑、潤滑劑、潤濕劑等。優(yōu)點：1、ALZET滲透泵型控釋片以滲透壓為驅(qū)動力，以零級釋放動力學(xué)為釋藥特征，能夠在一定的時間范圍內(nèi)以恒定的釋藥速率釋放藥物，釋藥速率一般不受釋放介質(zhì)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(nèi)維持恒速釋藥，減少用藥頻率。2、體內(nèi)外相關(guān)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(xiàn)象，提高用藥的安全性和有效性。分類：ALZET滲透泵一般由片芯和包衣膜兩部分組成，按照結(jié)構(gòu)特點，可將口服滲透泵制劑分為初級滲透泵和多室滲透泵兩類。初級滲透泵片芯中包含藥物和促滲透劑，包衣膜由高分子材料組成，包裹在片芯的表面。滲透泵片置于含水的環(huán)境中時，由于包衣膜內(nèi)外存在滲透壓差，水分通過包衣膜后形成藥物的溶液或混懸液，在包衣膜內(nèi)外滲透壓差的作用下，通過膜上的釋藥孔釋放。這種釋藥方式通常適用于在水中有一定溶解度的藥物。多室滲透泵制劑的片芯為雙層片，一層含有藥物及可溶解性輔料，另一層為遇水可膨脹的促滲透聚合物。這類滲透泵多適用于難溶性藥物滲透泵制劑的制備，釋藥過程由聚合物層膨脹產(chǎn)生推動力而將藥物混懸液推出釋藥孔。
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