Liquid ophthalmic sustained release delivery system
First Claim
1. A method of providing a slow and sustained release of an ophthalmic treating agent to the eye of a mammal which comprises administering to the eye of a said mammal an effective amount of a homogeneous liquid aqueous ophthalmic pharmaceutical composition, of pH between about 3.0 and about 6.2, which is administrable in drop form and which comprises an ophthalmically effective concentration of a said ophthalmic treating agent and about 0.05% to about 10% by weight of the polymer chitosan as the release rate controlling agent;
- said polymer consisting essentially of(A) monomeric β
(1→
4)-D-glucosamine linked units and of(B) monomeric β
(1→
4)-N-acetyl-D-glucosamine linked units which are scattered randomly in themolecule of the polymer, the numerical proportions of A and B being from about 60 to about 99% of A and about 1 to about 40% of B, and the viscosity rating of the polymer being from about 3 to about 3000 cps;
in which method, upon contact with the higher pH of the ocular fluid, said liquid formulation is converted to a stiff gel from which the ophthalmic treating agent is slowly released over a prolonged period of time.
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Accused Products
Abstract
Disclosed is a sustained release liquid aqueous ophthalmic delivery system and a method of providing a slow and sustained release of ophthalmic treating agents to the eye of a mammal which comprises administering to the eye of a said mammal an effective amount of a homogeneous liquid aqueous ophthalmic pharmaceutical composition, of pH between about 3.0 and about 6.2, which is adminstrable in drop form and which comprises an ophthalmically effective concentration of a said ophthalmic treating agent and about 0.05% to about 10% by weight of the polymer chitosan; said polymer consisting essentially of
(A) monomeric β(1→4)-D-glucosamine linked units and of
(B) monomeric β(1→4)-D-glucosamine linked units which are scattered
randomly in the molecule of the polymer, the numerical proportions of A and B being from about 60 to about 99% of A and about 1 to about 40% of B, the viscosity rating being from about 3 to about 3000 cps; in which method, upon contact with the higher pH of the ocular fluid, said liquid formulation is converted to a stiff gel from which the ophthalmic treating agent is slowly released over a prolonged period of time.
95 Citations
21 Claims
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1. A method of providing a slow and sustained release of an ophthalmic treating agent to the eye of a mammal which comprises administering to the eye of a said mammal an effective amount of a homogeneous liquid aqueous ophthalmic pharmaceutical composition, of pH between about 3.0 and about 6.2, which is administrable in drop form and which comprises an ophthalmically effective concentration of a said ophthalmic treating agent and about 0.05% to about 10% by weight of the polymer chitosan as the release rate controlling agent;
- said polymer consisting essentially of
(A) monomeric β
(1→
4)-D-glucosamine linked units and of(B) monomeric β
(1→
4)-N-acetyl-D-glucosamine linked units which are scattered randomly in themolecule of the polymer, the numerical proportions of A and B being from about 60 to about 99% of A and about 1 to about 40% of B, and the viscosity rating of the polymer being from about 3 to about 3000 cps;
in which method, upon contact with the higher pH of the ocular fluid, said liquid formulation is converted to a stiff gel from which the ophthalmic treating agent is slowly released over a prolonged period of time. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15)
- said polymer consisting essentially of
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16. A sustained release liquid aqueous ophthalmic delivery system for an ophthalmic treating agent of a pH between about 3.0 to about 6.2, which comprises about 0.05% to about 10% by weight of the polymer chitosan as the release rate controlling agent, said polymer consisting essentially of
(A) monomeric β - (1→
4)-D-glucosamine linked units and(B) monomeric β
(1→
4)-N-acetyl-D-glucosamine linked units which are scattered randomly in the molecule of the polymer, the numerical proportions of A and B being from about 60 to about 99% of A and about 1 to about 40% of B, and the viscosity rating of the polymer being from about 3 to about 3000 cps;
said delivery system which is administrable in drop form being converted to a stiff gel on contact with the higher pH of the ocular fluid so as to provide a slow release into the eye for a prolonged period of time of the ophthalmic treating agent incorporated therein. - View Dependent Claims (17, 18, 19, 20)
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21. A liquid aqueous ophthalmic pharmaceutical composition of pH between about 3.0 and about 6.2, which is administrable in drop form, and which comprises about 0.05% to about 10% by weight of the polymer chitosan as the release rate controlling agent and an ophthalmic treating agent at an effective concentration;
- said polymer consisting essentially of
(A) monomeric β
(1→
4)-D-glucosamine linked units and of(B) monomeric β
(1→
4)-N-acetyl-D-glycosamine linked units which are scattered randomly in the molecule of the polymer, the numerical proportions of A and B being from about 60 to 99% of A and about 1 to about 40% of B, and the viscosity rating of the polymer being from about 3 to about 3000 cps;
said pharmaceutical composition upon contact with the higher pH of the ocular fluid being converted to a stiff gel so as to provide a slow release of the ophthalmic treating agent into the eye for a prolonged period of time.
- said polymer consisting essentially of
Specification