Details for Patent: 4,968,507

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Summary for Patent: 4,968,507

Title:	Controlled porosity osmotic pump
Abstract:	The instant invention is directed to an osmotic pump comprising: (A) at least one active agent surrounded by (B) a rate controlling water insoluble wall, having a fluid permeability of 6.96.times.10.sup.-18 to 6.96.times.10.sup.-14 cm.sup.3 sec/g and a reflection coefficient of less than 1, prepared from: (i) a polymer permeable to water but impermeable to solute and (ii) 0.1 to 60% by weight, based on the total weight of (i) and (ii), of at least one pH insensitive pore forming additive dispersed throughout said wall.
Inventor(s):	Zentner; Gaylen M. (Lawrence, KS), Rork; Gerald S. (Lawrence, KS), Himmelstein; Kenneth J. (Irvine, CA)
Assignee:	Merck & Co., Inc. (Rahway, NJ)
Application Number:	07/073,781
Patent Claim Types: see list of patent claims	Delivery; Device;

Drugs Protected by US Patent 4,968,507

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