发明名称 |
PH-TRIGGERED OSMOTIC BURSTING DELIVERY DEVICES |
摘要 |
An osmotic bursting device for dispensing a beneficial agent to an aqueous environment. The device comprises a beneficial agent and osmagent surrounded at least in part by a semipermeable membrane. Alternatively the beneficial agent may also function as the osmagent. The semipermeable membrane is permeable to water and substantially impermeable to the beneficial agent and osmagent. A trigger means is attached to the semipermeable membrane (e.g., joins two capsulehalves). The trigger means is activated by a pH of from 3 to 9 and triggers the eventual, but sudden, delivery of the beneficial agent. These devices enable thePH-triggered release of the beneficial agent core as a bolus by osmotic bursting.!
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申请公布号 |
CA2116288(C) |
申请公布日期 |
1997.11.18 |
申请号 |
CA19942116288 |
申请日期 |
1994.02.23 |
申请人 |
PFIZER INC. |
发明人 |
SMITH, KELLY L.;HERBIG, SCOTT M. |
分类号 |
A61K9/00;A61K9/22;A61K9/28;A61K9/48;A61K9/50;A61K9/52;A61K45/00;A61K47/32;A61K47/38;A61P43/00;(IPC1-7):A61K9/22 |
主分类号 |
A61K9/00 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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