Osmotic devices having vapor-permeable coatings
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United States of America Patent
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Oct 27, 1998
Issued Date -
N/A
app pub date -
Jan 17, 1996
filing date -
Jul 22, 1993
priority date (Note) -
Expired
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Abstract
An osmotic device that, following the imbibement of water vapor, provides for the controlled release of a beneficial agent to an aqueous environment. The device comprises a hydrophilic formulation including a beneficial agent, and if needed, an osmagent, surrounded by a wall. The wall is formed at least in part of a semipermeable hydrophobic membrane having an average pore size between about 0.1 .mu.m and 30 .mu.m. The pores are substantially filled with a gas phase. The hydrophobic membrane is permeable to water in the vapor phase and the hydrophobic membrane is impermeable to an aqueous medium at a pressure less than about 100 Pa. The beneficial agent is released, for example, by osmotic pumping or osmotic bursting upon imbibement of sufficient water vapor into the device core. These devices minimize incompatibilities between the beneficial agent and ions (such as hydrogen or hydroxyl) or other dissolved or suspended materials in the aqueous medium, since contact between the beneficial agent and the aqueous medium does not occur until after the beneficial agent is released. This results from the semipermeable membrane's selective permeability for water vapor. In addition, the high water fluxes attendant with these vapor-permeable membranes facilitate the delivery of beneficial agents having low solubilities, and the delivery of high dosages of beneficial agents.
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- 15 United States
- 10 France
- 8 Japan
- 7 China
- 5 Korea
- 2 Other
Patent Owner(s)
- BEND RESEARCH, INC.
International Classification(s)
Inventor(s)
Inventor Name | Address | # of filed Patents | Total Citations |
---|---|---|---|
Cussler, Edward L | Edina, MN | 12 | 282 |
Herbig, Scott M | Bend, OR | 32 | 967 |
Smith, Kelly L | Bend, OR | 14 | 574 |
van, Eikeren Paul | Bend, OR | 14 | 220 |
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Fee | Large entity fee | small entity fee | micro entity fee |
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Surcharge after expiration - Late payment is unavoidable | $700.00 | $350.00 | $175.00 |
Surcharge after expiration - Late payment is unintentional | $1,640.00 | $820.00 | $410.00 |
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