Osmotic drug delivery system
First Claim
1. An osmotic delivery system shaped and sized for oral ingestion, implantation, rectal, vaginal or ocular insertion, for delivery of a drug or other beneficial substance comprising a compartment consisting of at least one chamber, said chamber being adapted to house osmotically active agents, adsorption adjuvants, drugs, and pro-drugs, said chamber being formed by an external shell of a rigid microporous material;
- and at least one overlayer of a semipermeable membrane substantially covering the external shell of said chamber leaving exposed a microporous drug-emitting surface.
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0 Petitions
Accused Products
Abstract
An osmotic drug (or other beneficial substance) delivery system comprises a compartment with one or more chambers in series formed by an external shell and chamber-dividing walls of a microporous material and successive overlayers of semipermeable membranes completely covering the outer shell of all but one chamber and substantially covering the outer shell of that one chamber, each successive overlayer completely covering all but one more chamber and substantially covering that one more chamber. Osmotic agents, adjuvants, enzymes, drugs, pro-drugs, pesticides and the like are incorporated in the chambers covered by the semipermeable membranes, and external fluids that diffuse into that chamber form solutions and by osmotic pressure are forced through the microporous chamber-dividing wall to the drug or drug-forming chamber to form a solution thereof and then through the exposed microporous shell to the exterior of the device at a rate controlled by the permeability of the semipermeable overlay and the osmotic pressure gradient across the shell.
176 Citations
11 Claims
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1. An osmotic delivery system shaped and sized for oral ingestion, implantation, rectal, vaginal or ocular insertion, for delivery of a drug or other beneficial substance comprising a compartment consisting of at least one chamber, said chamber being adapted to house osmotically active agents, adsorption adjuvants, drugs, and pro-drugs, said chamber being formed by an external shell of a rigid microporous material;
- and at least one overlayer of a semipermeable membrane substantially covering the external shell of said chamber leaving exposed a microporous drug-emitting surface.
- View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
Specification