EP0180708A1 — Osmotic drug delivery device
Assigned to Merck and Co Inc · Expires 1986-05-14 · 40y expired
What this patent protects
An osmotic drug (or other beneficial substance) delivery device comprises a compartment with a chamber formed by an external shell (2) of a microporous material, and an overlayer of a semipermeable membrane (1) substantially covering the outer shell (2) of the chamber. Osmotic ag…
USPTO Abstract
An osmotic drug (or other beneficial substance) delivery device comprises a compartment with a chamber formed by an external shell (2) of a microporous material, and an overlayer of a semipermeable membrane (1) substantially covering the outer shell (2) of the chamber. Osmotic agents, adjuvants enzymes, drugs, pro-drugs, pesticides and the like are incorporated in the chamber covered by the semipermeable membrane, and external fluids that diffuse into this chamber form solutions and by osmotic pressure are forced through the exposed microporous shell (2) 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.
Drugs covered by this patent
Bibliographic data sourced from FDA Orange Book + USPTO public records. Plain-English summary generated by AI grounded in source text. Patent term extensions (PTR, SPC, pediatric) may shift the effective expiry. Not legal advice.
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