Microporous-semipermeable laminated osmotic system
First Claim
1. An osmotic therapeutic system for the controlled dispensing of a drug formulation to an animal, which system comprises:
- (a) a shaped laminated wall comprising a lamina formed of a semipermeable material permeable to the passage of an external fluid and substantially impermeable to the passage of drug formulation, and a lamina formed of a microporous material, said laminated wall surrounding and forming;
(b) a compartment containing the drug formulation which exhibits an osmotic pressure gradient across the wall, and wherein the drug is a member selected from the group of drugs that act on the peripheral and central nervous systems, adrenergic and cholinergic receptors, skeletal system, skeletal and smooth muscles, circulatory and cardiovascular systems, synoptic and neuroeffector sites, alimentary and excretory systems, endocrine, hormone, autocoid, reproductive and immunological systems; and
,(c) a passageway in the laminated wall communicating with the compartment and the exterior of the osmotic system for dispensing drug from the system over a prolonged period of time.
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Abstract
An osmotic therapeutic system for delivering a drug is disclosed. The system comprises a drug delivery module which module comprises a rate controlling laminated wall surrounding a reservoir and has a portal for delivering drug from the system. The laminated wall comprises a semipermeable lamina in laminar arrangement with a microporous lamina to provide a wall that is permeable to an external fluid, impermeable to drug and maintains its integrity during the delivery of drug. The reservoir contains a drug, or a mixture of drug and a solute which drug or solute is soluble in the fluid and exhibits an osmotic pressure gradient across the wall against the fluid. In operation, drug is released from the system by fluid being imbibed through the wall into the reservoir at a rate determined by the permeability of the wall and the osmotic pressure gradient across the wall thereby producing a solution of drug, or a solution of solute containing drug which solution is released through the portal at a controlled rate over a prolonged period of time.
903 Citations
66 Claims
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1. An osmotic therapeutic system for the controlled dispensing of a drug formulation to an animal, which system comprises:
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(a) a shaped laminated wall comprising a lamina formed of a semipermeable material permeable to the passage of an external fluid and substantially impermeable to the passage of drug formulation, and a lamina formed of a microporous material, said laminated wall surrounding and forming; (b) a compartment containing the drug formulation which exhibits an osmotic pressure gradient across the wall, and wherein the drug is a member selected from the group of drugs that act on the peripheral and central nervous systems, adrenergic and cholinergic receptors, skeletal system, skeletal and smooth muscles, circulatory and cardiovascular systems, synoptic and neuroeffector sites, alimentary and excretory systems, endocrine, hormone, autocoid, reproductive and immunological systems; and
,(c) a passageway in the laminated wall communicating with the compartment and the exterior of the osmotic system for dispensing drug from the system over a prolonged period of time. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45)
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46. An osmotic therapeutic system for the controlled dispensing of a beneficial formulation to an animal, wherein the system comprises:
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(a) a shaped laminated wall comprising a semipermeable lamina permeable to the passage of an external fluid and substantially impermeable to the passage of drug formulation, and a lamina formed of a microporous material having a plurality of micropores with micropaths through the lamina, said micropores having a reflection coefficient of less than 1, from 5 to 95% micropores of from 10 angstroms to 100 micron size, and a flux through the micropores expressed by;
##EQU20## wherein J is the volume transported per unit of lamina area having N number of micropores of radius N, ζ
is the tortuosity, η
is the viscosity of the fluid in the micropores, and Δ
P is the pressure difference across the lamina with thickness Δ
x, said laminated wall surrounding and forming;(b) a compartment housing the drug formulation, wherein the drug is a member selected from the group consisting of anticonvulsant, antiparkinson, analgesics, hormonal, diuretic, opthalmic, tranquilizer, hypoglycemic, anti-infective, antipyretic, and psychic energizer drugs, (d) wherein in operation, when the system is in the animal and dispensing drug, fluid therefrom is imbibed through the laminated wall into the compartment, thereby forming a solution of drug formulation that is dispersed through the passageway at a controlled rate over a prolonged period of time. - View Dependent Claims (47, 48, 49, 50)
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51. A method for the controlled administration of a drug formulation to the gastrointestinal tract of a human, which method comprises:
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A. admitting orally into the gastrointestinal tract an osmotic therapeutic system comprising; (1) a shaped laminated wall comprising a lamina formed of a semipermeable material that is permeable to the passage of drug formulation, and a lamina made of a material that forms a microporous lamina in the gastrointestinal tract, which microporous lamina comprises a plurality of micropores having a reflection coefficient of less than 1, said laminated wall surrounding and forming; (2) a compartment containing the drug formulation that exhibits an osmotic pressure gradient across the wall; (3) a passageway in the wall communicating with the compartment and the exterior of the system for administering drug from the system; and
,B. administering drug to the gastrointestinal tract by imbibing fluid through the wall into the compartment, thereby forming a solution containing drug that is dispensed through the passageway at a controlled rate in a therapeutically effective amount over a prolonged period of time. - View Dependent Claims (52, 53, 54, 55, 56, 57, 58, 59, 60, 61, 62, 63, 64, 65, 66)
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Specification