×

Morphine controlled release system

  • US 9,375,428 B2
  • Filed: 09/25/2014
  • Issued: 06/28/2016
  • Est. Priority Date: 03/26/2003
  • Status: Expired due to Fees
First Claim
Patent Images

1. A controlled release oral pharmaceutical composition, comprising(i) an erodible matrix composition having a cylindrical shape having a long axis and a conus-shaped end portion having a largest diameter and a smallest diameter, wherein the conus-shaped end portion extends across from about 5% to about 50% of the long axis of the cylindrical shape and the ratio of the largest diameter to the smallest diameter of the conus-shaped end portion is from about 2.5 to 1 to about 1.2 to 1, wherein the matrix composition comprises:

  • (a) a first polyethylene oxide having a molecular weight selected from the group consisting of about 100,000 daltons, about 150,000 daltons, about 200,000 daltons, about 250,000 daltons, about 300,000 daltons and about 400,000 daltons,(b) a therapeutically effective amount of an opioid or a pharmaceutically acceptable salt, complex, solvate or anhydrate thereof, or a mixture thereof and, optionally,(c) one or more pharmaceutically acceptable excipients, and(ii) a coating on the matrix composition, comprising(a) a material selected from the group consisting of cellulose acetate, polyamide, polyethylene, polyethylene terephthalate, polypropylenem polyurethane, polyvinyl acetate, polyvinyl chloride, silicone rubber, latex, polyhydroxybutyrate, polyhydroxyvalerate, teflon, polylactic acid or polyglycolic acid and copolymers thereof, ethylene vinyl acetate (EVA), styrene-butadienestyrene (SBS) and styrene-isoprene-styrene (SIS), and(b) a plasticizer,wherein the coating has at least one opening exposing a surface of the conus-shaped end portion of the matrix composition, thereby allowing controlled release of said opioid by erosion of said matrix surface, wherein the surface area exposed increases during erosion of the conus-shaped end portion,wherein the coating and the matrix composition are formed by injection molding,wherein the composition exhibits zero order release of at least 80% of the opioid contained in the composition, andwherein about 75% w/w of the opioid is released from the composition within 4-10 hours when subject to a dissolution test in accordance with USP 24, NF 19, (711), Dissolution, employing Apparatus 2 equipped with a paddle using 1000 mL of 0.1 N hydrochloric acid dissolution medium and a paddle rotation of 120 rpm for the first 120 minutes, and a buffer solution having a pH of 6.8 and a paddle rotation of 50 rpm thereafter.

View all claims
  • 3 Assignments
Timeline View
Assignment View
    ×
    ×