Multiparticulate controlled porosity osmotic
First Claim
1. A multiparticulate osmotic pump, for the controlled release of a pharmaceutically active agent to an environment of use, said pump comprising:
- (I) a carrier medium which does not maintain its integrity in the environment of use;
(II) a multiple of tiny osmotic pump elements each consisting essentially of;
(A) a core comprises at least one pharmacologically active agent soluble in an external fluid, or a mixture of an agent having a limited solubility in the external fluid with an osmotically effective solute that is soluble in the fluid, which exhibit an osmotic pressure gradient across the wall against the external fluid surrounded by(B) a rate controlling water insoluble wall, having a fluid permeability of 6.96×
10-18 to 6.96×
10-14 cm3 sec/g and a reflection coefficient of less than 0.5, 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.
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Accused Products
Abstract
The instant invention is directed to a multiparticulate osmotic pump, for the controlled release of a pharmaceutically active agent to an environment of use, said pump comprising:
(I) a carrier medium which does not maintain its integrity in the environment of use;
(II) a multiple of tiny osmotic pump elements each consisting essentially of:
(A) a core comprises at least one pharmacologically active agent soluble in an external fluid, or a mixture of an agent having a limited solubility in the external fluid with an osmotically effective solute that is soluble in the fluid, which exhibit an osmotic pressure gradient across the wall against the external fluid surrounded by
(B) a rate controlling water insoluble wall, having a fluid permeability of 6.96×10-18 to 6.96×1014 cm3 sec/g and a reflection coefficient of less than 0.5, 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.
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Citations
20 Claims
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1. A multiparticulate osmotic pump, for the controlled release of a pharmaceutically active agent to an environment of use, said pump comprising:
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(I) a carrier medium which does not maintain its integrity in the environment of use; (II) a multiple of tiny osmotic pump elements each consisting essentially of; (A) a core comprises at least one pharmacologically active agent soluble in an external fluid, or a mixture of an agent having a limited solubility in the external fluid with an osmotically effective solute that is soluble in the fluid, which exhibit an osmotic pressure gradient across the wall against the external fluid surrounded by (B) a rate controlling water insoluble wall, having a fluid permeability of 6.96×
10-18 to 6.96×
10-14 cm3 sec/g and a reflection coefficient of less than 0.5, 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. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20)
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Specification