Gastric remaining preparation, swollen molding, and production process
First Claim
1. An extruded expanded gastric molding for a sustained release preparation comprising an extruded pharmaceutically acceptable acid resistant polymer or co-polymer which is capable of being expanded into a microfine porous structure, as a predominant component comprising at least 25% by weight of the molding, and a pharmaceutical drug substance, with said polymer compound having been physically reacted with sufficient auxiliary blowing agent, during extrusion of the polymer compound and the drug substance;
- to provide said microfine porous structure with a mesh-like cross section in the extruded molding and an apparent density of less than 1, whereby the microfine porous molding is capable of floating on gastric fluids for sustained release of the pharmaceutical drug substance.
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Accused Products
Abstract
A gastric remaining preparation having a configuration entirely different from that of the conventional ones. It comprises a swollen molding having a mesh-like cross-section and an apparent density of less than 1, containing an acid-resistant polymer compound as a predominant component as well as at least an auxiliary blowing agent and a drug substance. The molding can be produced by using a multi-screw extruder.
26 Citations
8 Claims
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1. An extruded expanded gastric molding for a sustained release preparation comprising an extruded pharmaceutically acceptable acid resistant polymer or co-polymer which is capable of being expanded into a microfine porous structure, as a predominant component comprising at least 25% by weight of the molding, and a pharmaceutical drug substance, with said polymer compound having been physically reacted with sufficient auxiliary blowing agent, during extrusion of the polymer compound and the drug substance;
- to provide said microfine porous structure with a mesh-like cross section in the extruded molding and an apparent density of less than 1, whereby the microfine porous molding is capable of floating on gastric fluids for sustained release of the pharmaceutical drug substance.
- View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
Specification