Medicinal and/or nutritional microcapsules for oral administration
DCFirst Claim
1. Microcapsules of reservoir kind containing at least one medicinal nd nutritional active principle (AP), with the exclusion of acetylsalicylic acid (ASA), which are intended for oral administration, characterized:
- in that they consist of particles of AP each coated with at least one coating film of specific following composition;
1- at least one film-forming polymer (P1) which is insoluble in the liquids of the digestive tract, present in a quantity of 50 to 90%, preferably 50 to 80% by weight of dry matter of the whole coating composition, and consisting of at least one non-hydrosoluble cellulose derivate, ethylcellulose and/or cellulose acetate being prefered;
2- at least one nitrogen-containing polymer (P2), present in a quantity of 2 to 25, preferably 5 to 15% by weight of dry matter of the whole coating composition, and consisting of at least one polyacrylarnide and/or one poly-N-vinylamide and/or one poly-N-vinyl-lactame, the polyacrylamide and/or the polyvinylpyrrolidone being prefered;
3- at least one plasticizer present in a quantity of 2 to 20%, preferably 4 to 15% by weight of dry matter of the whole coating composition, and consisting of at least one of the following compounds;
glycerol esters, phtalates, citrates, sebacates, cetylalcohol esters, castor oil and cutin, castor oil being particularly prefered;
4- at least one surface-active and/or lubricating agent, present in a quantity of 2 to 20%, preferably 4 to 15% by weight of dry matter of the whole coating composition, and chosen from anionic surfactants, preferably the alkali metal or alkakine-earth metal salts of fatty acids, stearic acid and/or oleic acid being preferred, and/or from nonionic surfactants, preferably polyoxyethylenated esters of sorbitan and/or polyoxyethylenated esters of sorbitan and/or polyoxyethylenated derivatives of castor oil, and/or from lubricants such as stearates, preferably calcium, magnesium, aluminium or zinc stearate, or such as stearylfumarate, preferably sodium stearylfimarate, and/or glyceryl behenate, said agent comprising only one or a mixture of the above products;
in that they have a particle size of between 50 and 1000 microns, preferably of between 100 and 750 microns and, more preferably, of between 100 and 500 microns;
in that they are designed so as to be able to remain in the small intestine for a period of at least about 5 hours, preferably of at least about 7 hours and, even more preferably, for a period of between about 8 hours and about 24 hours, and permitting so the absorption of the AP during at least part of their residence in the small intestine.
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Abstract
The present invention relates to microcapsules for the oral administration of medicinal and/or nutritional active principles (AP), which are smaller than or equal to 1000 μm in size. These microcapsules consist of particles which are coated with a coating material consisting of a mixture of a film-forming polymer derivative, a hydrophobic plasticizer, a functional agent and a nitrogen-containing polymer. These microcapsules are also characterized by their ability to remain in the small intestine for a long time (at least 5 hours) and to allow, during the residence, release and absorption of the AP. The invention also relates to a process for the production of the said microcapsules.
227 Citations
14 Claims
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1. Microcapsules of reservoir kind containing at least one medicinal nd nutritional active principle (AP), with the exclusion of acetylsalicylic acid (ASA), which are intended for oral administration, characterized:
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in that they consist of particles of AP each coated with at least one coating film of specific following composition; 1- at least one film-forming polymer (P1) which is insoluble in the liquids of the digestive tract, present in a quantity of 50 to 90%, preferably 50 to 80% by weight of dry matter of the whole coating composition, and consisting of at least one non-hydrosoluble cellulose derivate, ethylcellulose and/or cellulose acetate being prefered; 2- at least one nitrogen-containing polymer (P2), present in a quantity of 2 to 25, preferably 5 to 15% by weight of dry matter of the whole coating composition, and consisting of at least one polyacrylarnide and/or one poly-N-vinylamide and/or one poly-N-vinyl-lactame, the polyacrylamide and/or the polyvinylpyrrolidone being prefered; 3- at least one plasticizer present in a quantity of 2 to 20%, preferably 4 to 15% by weight of dry matter of the whole coating composition, and consisting of at least one of the following compounds;
glycerol esters, phtalates, citrates, sebacates, cetylalcohol esters, castor oil and cutin, castor oil being particularly prefered;4- at least one surface-active and/or lubricating agent, present in a quantity of 2 to 20%, preferably 4 to 15% by weight of dry matter of the whole coating composition, and chosen from anionic surfactants, preferably the alkali metal or alkakine-earth metal salts of fatty acids, stearic acid and/or oleic acid being preferred, and/or from nonionic surfactants, preferably polyoxyethylenated esters of sorbitan and/or polyoxyethylenated esters of sorbitan and/or polyoxyethylenated derivatives of castor oil, and/or from lubricants such as stearates, preferably calcium, magnesium, aluminium or zinc stearate, or such as stearylfumarate, preferably sodium stearylfimarate, and/or glyceryl behenate, said agent comprising only one or a mixture of the above products; in that they have a particle size of between 50 and 1000 microns, preferably of between 100 and 750 microns and, more preferably, of between 100 and 500 microns; in that they are designed so as to be able to remain in the small intestine for a period of at least about 5 hours, preferably of at least about 7 hours and, even more preferably, for a period of between about 8 hours and about 24 hours, and permitting so the absorption of the AP during at least part of their residence in the small intestine. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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14. A method for treating and/or preventing diseases and/or pains, which comprises using microcapsules as a vehicle for at least one medicinal, nutritional or combination thereof as Active Principle (AP) which is capable of remaining in the small intestine for a prolonged period, said microcapsules:
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being designed for oral administration and so as; to be able to remain in the small intestine for at least about 5 hours, preferably at least about 7 hours and, even more preferably, for a period of between 8 and 24 hours, and to make it possible to release the AP in the small intestine during at least part of their residence, and consisting of particles of AP each coated with at least one coating film of specific composition and having a particle size of between 50 and 1000 μ
m, preferably of between 100 and 750 μ
m and, even more preferably, of between 200 and 500 μ
m.
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Specification