The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Apr. 14, 2015
Filed:
Apr. 29, 2010
Qingwei Jiang, Beijing, CN;
Weifeng Yi, Beijing, CN;
Quanzhi Liu, Beijing, CN;
Wenbin Yang, Beijing, CN;
Junli Zheng, Beijing, CN;
Qingwei Jiang, Beijing, CN;
Weifeng Yi, Beijing, CN;
Quanzhi Liu, Beijing, CN;
Wenbin Yang, Beijing, CN;
Junli Zheng, Beijing, CN;
Beijing Team Hospital Management Co., Ltd., Beijing, CN;
Abstract
An osmotic pump controlled release tablet and the preparation method thereof are disclosed. The osmotic pump controlled release tablet is composed of tablet core, semipermeable membrane and optional film coating. The material of said semipermeable membrane is composed of ethyl cellulose and povidone in the ratio of 1:1˜1:4 by weight. Said tablet core comprises drug containing layer and push layer. The osmotic pump controlled release tablet also characterizes in that; (1) the angle θformed by the outer curved surface of the drug containing layer and the lateral surface is 120°-180°; and/or (2) the ratio of Lto r is 0.27-1.0, wherein Lis the vertical distance from the central vertex of the outer curved surface of the drug containing layer to the plane formed by the intersection line between the outer curved surface of the drug containing layer and the lateral surface, and r is the radius of the tablet core.