Patent US5196203A successfully refreshed from Google Patents.
US5196203A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Theophylline dosage form
Assignee: Mayne Pharma International Pty Ltd
•
Filing: 1991-09-27
•
Granted: 1993-03-23
•
Expires: 2011-09-27
Abstract
Abstract A pH-dependent sustained release pharmaceutical pellet composition and a method of administering the same to a patient at a predetermined dosage and interval, said pellet composition comprising: a core element containing a therapeutically effective amount of theophylline, xanthine or a derivative thereof as the active ingredient and a coating on said core element which comprises the following components: (a) at least 40% of a matrix polymer which is insoluble at a pH of from 1 to 7.5 and contributes to the control of the rate of release of the active ingredient in the stomach and intestines; (b) from 1 to 30% of an enteric polymer which is substantially insoluble at a pH of from 1 to 4, sufficient to delay the release of the active ingredient in the stomach, but which is soluble at a pH of from 6 to 7.5 so as not to substantially delay release in the intestines; (c) from 1 to 60% of a compound soluble at a pH of from 1 to 4, sufficient to enable initiation of release of the active ingredient in the stomach; said percentages being by weight based on total weight of components (a), (b), and (c); the ratio of the components (a), (b), and (c) in said coating being effective to allow the initiation of the release of the active ingredient in the stomach at a slow rate and to control the release in the intestines at a rate faster than that in the stomach such that a dose of the pellet composition delivers to the patient a therapeutically effective amount of said active ingredient over the course of said predetermined interval, said coated core element having a diameter of from 510 to 2400 microns.
Inventors
- 👤 Garth Boehm
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 23:27
CPC Classifications
A; A61; A61K; A61K9/00; A61K9/48; A61K9/50; A61K9/5005; A61K9/5021; A61K9/5036; A61K9/5042; A61K9/5047; A61K31/00; A61K31/33; A61K31/395; A61K31/495; A61K31/505; A61K31/519; A61K31/52; A61K9/5026; A61K9/5031; A61K9/5073; A61K9/5078
Claims Analysis
Total Claims: 18
Claim 1
Independent Claim
278 words
A pH-dependent sustained release pharmaceutical pellet composition for administration to a patient at a predetermined dosage and interval which comprises: a core element containing a therapeutically effective amount of methylated xanthine or a salt thereof as the active ingredient and a coating on said core element which comprises the following components: (a) at least 40% of a matrix polymer which is insoluble at a pH of from 1 to 7.5 and contributes to the control of the rate of release of the active ingredient in the stomach and intestines; (b) from 1 to 30% of an enteric polymer which is substantially insoluble at a pH of from 1 to 4, sufficient to delay the release of the active ingredient in the stomach, but which is soluble at a pH of from 6 to 7.5 so as not to substantially delay release in the intestines; (c) from 1 to 60% of a compound soluble at a pH of from 1 to 4, sufficient to enable initiation of release of the active ingredient in the stomach; said percentages being by weight based on total weight of components (a), (b), and (c); the ratio of the components (a), (b), and (c) in said coating being effective to allow the initiation of the release of the active ingredient in the stomach at a slow rate and to control the release in the intestines at a rate faster than that in the stomach such that a dose of the pellet composition delivers to the patient a therapeutically effective amount of said active ingredient over the course of said predetermined interval, said coated core element having a diameter of from 510 to 2400 microns.
Claim 2
Dependent Claim
278 words
A pH-dependent sustained release pharmaceutical pellet composition for administration to a patient at a predetermined dosage and interval which comprises: a core element containing a therapeutically effective amount of methylated xanthine or a salt thereof as the active ingredient and a coating on said core element which comprises the following components: (a) at least 40% of a matrix polymer which is insoluble at a pH of from 1 to 7.5 and contributes to the control of the rate of release of the active ingredient in the stomach and intestines; (b) from 1 to 30% of an enteric polymer which is substantially insoluble at a pH of from 1 to 4, sufficient to delay the release of the active ingredient in the stomach, but which is soluble at a pH of from 6 to 7.5 so as not to substantially delay release in the intestines; (c) from 1 to 60% of a compound soluble at a pH of from 1 to 4, sufficient to enable initiation of release of the active ingredient in the stomach; said percentages being by weight based on total weight of components (a), (b), and (c); the ratio of the components (a), (b), and (c) in said coating being effective to allow the initiation of the release of the active ingredient in the stomach at a slow rate and to control the release in the intestines at a rate faster than that in the stomach such that a dose of the pellet composition delivers to the patient a therapeutically effective amount of said active ingredient over the course of said predetermined interval, said coated core element having a diameter of from 510 to 2400 microns.
Claim 3
Dependent Claim
22 words
A sustained release pharmaceutical pellet composition according to claim 1, wherein the methylated xanthine salt is an ethylene diamine salt of theophylline.
Claim 4
Dependent Claim
31 words
The sustained release pharmaceutical pellet composition of claim 1 wherein the rate of release in the intestine is 1.2 to 3 times greater than the rate of release in the stomach.
Claim 5
Dependent Claim
71 words
The sustained release pharmaceutical pellet composition of claim 1 wherein the active ingredient has a first dissolution profile measured at a pH of from 1 to 4, and a second dissolution profile measured at a pH of about 7.5 and wherein said first and second dissolution profile are each at least equal to the minimum dissolution required to provide substantially the same bio-availability as with an immediate release oral dosage form.
Claim 6
Dependent Claim
93 words
The sustained release pharmaceutical pellet composition of claim 1 wherein the core coating contains: as component (a), ethyl cellulose, a quaternary ammonium acrylic or methacrylic polymer, an acrylic or a methacrylic ester copolymer or a mixture thereof; as component (b), cellulose acetate phthalate, hydroxypropyl methylcellulose phthalate, polyvinyl acetate phthalate, methacrylic acid:acrylic acid ester copolymer, hydroxypropyl methylcellulose acetate succinate, shellac, cellulose acetate trimellitate and mixtures thereof; and as component (c), polyvinylpyrrolidone, hydroxypropyl cellulose, hydroxypropyl methylcellulose, polyethylene glycol having a molecular weight of from 1700 to 20,000, polyvinyl alcohol and monomers therefor and mixtures thereof.
Claim 7
Dependent Claim
44 words
A sustained release pharmaceutical pellet composition according to claim 5 wherein the core element has a formulation ______________________________________
Theophylline 20 to 90% by weight
Hydroxypropylcellulose
0.1 to 10% by weight
Microcrystalline cellulose
1 to 20% by weight
Lactose 0 to 60% by weight.
______________________________________
Claim 8
Dependent Claim
35 words
The sustained release pharmaceutical pellet composition of claim 5 wherein the core coating comprises: 40 to 70% by weight of component (a); 2.5-10% by weight of component (b); and 20-40% by weight of component (c).
Claim 9
Dependent Claim
77 words
The sustained release pharmaceutical pellet composition of claim 5 wherein the core coating also includes up to 75% of a filler selected from silicon dioxide, titanium dioxide, talc, alumina, starch, kaolin, polacrilin potassium, powdered cellulose and microcrystalline cellulose and mixtures thereof and from 2.5 to 50% of plasticizer selected from diethyl phthalate, triethyl citrate, triethyl acetyl citrate, triethyl acetin, tributyl citrate, polyethylene glycol or glycerol, said percentages being based on the total weight of the core coating.
Claim 10
Dependent Claim
31 words
The sustained release pharmaceutical pellet composition of claim 5 wherein the rate of release in the intestine is 1.2 to 3 times greater than the rate of release in the stomach.
Claim 11
Dependent Claim
38 words
A sustained release pharmaceutical pellet composition according to claim 8 wherein the core coating contains: ______________________________________
Ethyl cellulose 40 to 70%
Hydroxypropylmethyl
2.5 to 10%
cellulose phthalate
Polyethylene glycol
20 to 40%
Diethyl phthalate 2.5 to 30%
______________________________________
Claim 12
Dependent Claim
30 words
A sustained release pharmaceutical pellet composition according to claim 8 wherein the core coating contains: ______________________________________
Eudragit NE30D 40-70%
Eudragit L30D 2.5-10%
polyethylene glycol 6000 NF
20-40%
Triethylcitrate 2.5-30%
______________________________________
Claim 13
Independent Claim
291 words
A method for treating cardiotonic, diuretic or respiratory conditions in a patient which comprises administering to said patient at a predetermined dosage and interval a pH-dependent sustained release pharmaceutical pellet composition which comprises: a core element containing a therapeutically effective amount of methylated xanthine or a salt thereof as the active ingredient and a coating on said core element which comprises the following components: (a) at least 40% of a matrix polymer which is insoluble at a pH of from 1 to 7.5 and contributes to the control of the rate of release of the active ingredient in the stomach and intestines; (b) from 1 to 30% of an enteric polymer which is substantially insoluble at a pH of from 1 to 4, sufficient to delay the release of the active ingredient in the stomach, but which is soluble at a pH of from 6 to 7.5 so as not to substantially delay release in the intestines; (c) from 1 to 60% of a compound soluble at a pH of from 1 to 4, sufficient to enable initiation of release of the active ingredient in the stomach; said percentages being by weight based on total weight of components (a), (b), and (c); the ratio of the components (a), (b), and (c) in said coating being effective to allow the initiation of the release of the active ingredient in the stomach at a slow rate and to control the release in the intestines at a rate faster than that in the stomach such that a dose of the pellet composition delivers to the patient a therapeutically effective amount of said active ingredient over the course of said predetermined interval, said coated core element having a diameter of from 510 to 2400 microns.
Claim 14
Independent Claim
291 words
A method for treating cardiotonic, diuretic or respiratory conditions in a patient which comprises administering to said patient at a predetermined dosage and interval a pH-dependent sustained release pharmaceutical pellet composition which comprises: a core element containing a therapeutically effective amount of methylated xanthine or a salt thereof as the active ingredient and a coating on said core element which comprises the following components: (a) at least 40% of a matrix polymer which is insoluble at a pH of from 1 to 7.5 and contributes to the control of the rate of release of the active ingredient in the stomach and intestines; (b) from 1 to 30% of an enteric polymer which is substantially insoluble at a pH of from 1 to 4, sufficient to delay the release of the active ingredient in the stomach, but which is soluble at a pH of from 6 to 7.5 so as not to substantially delay release in the intestines; (c) from 1 to 60% of a compound soluble at a pH of from 1 to 4, sufficient to enable initiation of release of the active ingredient in the stomach; said percentages being by weight based on total weight of components (a), (b), and (c); the ratio of the components (a), (b), and (c) in said coating being effective to allow the initiation of the release of the active ingredient in the stomach at a slow rate and to control the release in the intestines at a rate faster than that in the stomach such that a dose of the pellet composition delivers to the patient a therapeutically effective amount of said active ingredient over the course of said predetermined interval, said coated core element having a diameter of from 510 to 2400 microns.
Claim 15
Dependent Claim
300 words
A pH-dependent sustained release pharmaceutical pellet composition for administration to a patient at a predetermined dosage and interval which comprises: a core element containing a therapeutically effective amount of methylated xanthine or a salt thereof as the active ingredient and a coating on said core element which comprises the following components: (a) at least 40% of a matrix polymer which is insoluble at a pH of from 1 to 7.5 and is composed of ethyl cellulose, a quaternary ammonium acrylic or methacrylic polymer, an acrylic or a methacrylic ester copolymer or a mixture thereof which contributes to the control of the release of the active ingredient in the stomach and intestines; (b) from 1 to 30% of an enteric polymer which is substantially insoluble at a pH of from 1 to 4, sufficient to delay the release of the active ingredient in the stomach, but which is soluble at a pH of from 6 to 7.5 so as not to substantially delay release in the intestines; (c) from 1 to 60% of a compound soluble at a pH of from 1 to 4, sufficient to enable initiation of release of the active ingredient in the stomach; said percentages being by weight based on total weight of components (a), (b), and (c); the ratio of the components (a), (b), and (c) in said coating being effective to allow the initiation of the release of the active ingredient in the stomach at a slow rate and to control the release in the intestines at a rate faster than that in the stomach such that a dose of the pellet composition delivers to the patient a therapeutically effective amount of said active ingredient over the course of said predetermined interval, said coated core element having a diameter of from 510 to 2400 microns.
Claim 16
Dependent Claim
300 words
A pH-dependent sustained release pharmaceutical pellet composition for administration to a patient at a predetermined dosage and interval which comprises: a core element containing a therapeutically effective amount of methylated xanthine or a salt thereof as the active ingredient and a coating on said core element which comprises the following components: (a) at least 40% of a matrix polymer which is insoluble at a pH of from 1 to 7.5 and is composed of ethyl cellulose, a quaternary ammonium acrylic or methacrylic polymer, an acrylic or a methacrylic ester copolymer or a mixture thereof which contributes to the control of the release of the active ingredient in the stomach and intestines; (b) from 1 to 30% of an enteric polymer which is substantially insoluble at a pH of from 1 to 4, sufficient to delay the release of the active ingredient in the stomach, but which is soluble at a pH of from 6 to 7.5 so as not to substantially delay release in the intestines; (c) from 1 to 60% of a compound soluble at a pH of from 1 to 4, sufficient to enable initiation of release of the active ingredient in the stomach; said percentages being by weight based on total weight of components (a), (b), and (c); the ratio of the components (a), (b), and (c) in said coating being effective to allow the initiation of the release of the active ingredient in the stomach at a slow rate and to control the release in the intestines at a rate faster than that in the stomach such that a dose of the pellet composition delivers to the patient a therapeutically effective amount of said active ingredient over the course of said predetermined interval, said coated core element having a diameter of from 510 to 2400 microns.
Claim 17
Independent Claim
313 words
A method for treating cardiotonic, diuretic or respiratory conditions in a patient which comprises administering to said patient at a predetermined dosage and interval a pH-dependent sustained release pharmaceutical pellet composition which comprises: a core element containing a therapeutically effective amount of methylated xanthine or a salt thereof as the active ingredient and a coating on said core element which comprises the following components: (a) at least 40% of a matrix polymer which is insoluble at a pH of from 1 to 7.5 and is composed of ethyl cellulose, a quaternary ammonium acrylic or methacrylic polymer, an acrylic or a methacrylic ester copolymer or a mixture thereof which contributes to the control of the release of the active ingredient in the stomach and intestines; (b) from 1 to 30% of an enteric polymer which is substantially insoluble at a pH of from 1 to 4, sufficient to delay the release of the active ingredient in the stomach, but which is soluble at a pH of from 6 to 7.5 so as not to substantially delay release in the intestines; (c) from 1 to 60% of a compound soluble at a pH of from 1 to 4, sufficient to enable initiation of release of the active ingredient in the stomach; said percentages being by weight based on total weight of components (a), (b), and (c); the ratio of the components (a), (b), and (c) in said coating being effective to allow the initiation of the release of the active ingredient in the stomach at a slow rate and to control the release in the intestines at a rate faster than that in the stomach such that a dose of the pellet composition delivers to the patient a therapeutically effective amount of said active ingredient over the course of said predetermined interval, said coated core element having a diameter of from 510 to 2400 microns.
Claim 18
Independent Claim
313 words
A method for treating cardiotonic, diuretic or respiratory conditions in a patient which comprises administering to said patient at a predetermined dosage and interval a pH-dependent sustained release pharmaceutical pellet composition which comprises: a core element containing a therapeutically effective amount of methylated xanthine or a salt thereof as the active ingredient and a coating on said core element which comprises the following components: (a) at least 40% of a matrix polymer which is insoluble at a pH of from 1 to 7.5 and is composed of ethyl cellulose, a quaternary ammonium acrylic or methacrylic polymer, an acrylic or a methacrylic ester copolymer or a mixture thereof which contributes to the control of the release of the active ingredient in the stomach and intestines; (b) from 1 to 30% of an enteric polymer which is substantially insoluble at a pH of from 1 to 4, sufficient to delay the release of the active ingredient in the stomach, but which is soluble at a pH of from 6 to 7.5 so as not to substantially delay release in the intestines; (c) from 1 to 60% of a compound soluble at a pH of from 1 to 4, sufficient to enable initiation of release of the active ingredient in the stomach; said percentages being by weight based on total weight of components (a), (b), and (c); the ratio of the components (a), (b), and (c) in said coating being effective to allow the initiation of the release of the active ingredient in the stomach at a slow rate and to control the release in the intestines at a rate faster than that in the stomach such that a dose of the pellet composition delivers to the patient a therapeutically effective amount of said active ingredient over the course of said predetermined interval, said coated core element having a diameter of from 510 to 2400 microns.
References Cited (Backward Citations)
US4083949A
Cited
GB1568837A
Cited
US4367217A
Cited
GB2101069A
Cited
US4587118A
Cited
US4415547A
Cited
US4661162A
Cited
US4713248A
Cited
EP0164959A2
Cited
AU4323685A
Cited
US4851228A
Cited
AU5146085A
Cited
US4803080A
Cited
US4708874A
Cited
EP0260236A1
Cited
US4800087A
Cited
EP0270305A2
Cited
AU8199787A
Cited
US4844910A
Cited
EP0287536A1
Cited
US4786509A
Cited
EP0327295A2
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1996-03-22 | 1996-09-21 | 1997-03-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2000-03-22 | 2000-09-21 | 2001-03-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2004-03-22 | 2004-09-21 | 2005-03-23 | $7700.00 | Window Closed / Lapsed |