Dispensing device containing a hydrophobic medium
First Claim
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1. A device for controlled delivery of a beneficial agent to an aqueous containing environment, said device comprising:
- a shaped wall having a thickness of at least 100μ
m that surrounds and defines an internal reservoir;
said wall at least in part permeable to the aqueous environment and said wall formed at least in part of a sintered polymer microporous membrane permeable to a beneficial agent-containing hydrophobic medium when the wall is present in the aqueous containing environment, said sintered polymer impregnated with a low vapor pressure hydrophobic medium; and
said reservoir containing a mixture of a hydrophilic swellable composition and said beneficial agent-containing hydrophobic medium, said beneficial agent being insoluble or partially insoluble in said aqueous containing environment.
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Abstract
A device for the controlled delivery of an insoluble or partially aqueous insoluble beneficial agent to an aqueous containing environment. The device comprises a shaped wall that surrounds and defines an internal reservoir. The wall is formed at least in part of a sintered polymer microporous membrane permeable to a beneficial agent-containing hydrophobic medium when the wall is present in the aqueous containing environment. The reservoir contains a mixture of a hydrophilic swellable composition and a beneficial agent-containing hydrophobic medium.
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Citations
9 Claims
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1. A device for controlled delivery of a beneficial agent to an aqueous containing environment, said device comprising:
- a shaped wall having a thickness of at least 100μ
m that surrounds and defines an internal reservoir;
said wall at least in part permeable to the aqueous environment and said wall formed at least in part of a sintered polymer microporous membrane permeable to a beneficial agent-containing hydrophobic medium when the wall is present in the aqueous containing environment, said sintered polymer impregnated with a low vapor pressure hydrophobic medium; and
said reservoir containing a mixture of a hydrophilic swellable composition and said beneficial agent-containing hydrophobic medium, said beneficial agent being insoluble or partially insoluble in said aqueous containing environment. - View Dependent Claims (2, 3, 4)
- a shaped wall having a thickness of at least 100μ
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5. A device for controlled delivery of a beneficial agent to an aqueous containing environment, said device comprising:
- a shaped wall having a thickness of at least 100μ
m that surrounds and defines an internal reservoir;
said wall at least in part permeable to the aqueous environment and said wall formed at least in part of a sintered polymer microporous membrane permeable to a beneficial agent-containing hydrophobic medium when the wall is present in the aqueous containing environment, said sintered polymer impregnated with hydrogel and wetted with a low vapor pressure hydrophobic medium; and
said reservoir containing a mixture of a hydrophilic swellable composition and said beneficial agent-containing hydrophobic medium, said beneficial agent being insoluble or partially insoluble in said aqueous containing environment.
- a shaped wall having a thickness of at least 100μ
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6. A device for controlled delivery of a beneficial agent to an aqueous containing environment, said device comprising:
- a shaped wall having a thickness of at least 100μ
m that surrounds and defines an internal reservoir;
said wall at least in part permeable to the aqueous environment and said wall formed at least in part of a sintered polymer microporous membrane, said sintered polymer impregnated with a hydrophilic hydrogel wetted with a hydrophilic medium and at least one hole provided therethrough; and
said reservoir containing a mixture of a hydrophilic swellable composition and said beneficial agent-containing hydrophobic medium, said beneficial agent being insoluble or partially insoluble in said aqueous containing environment.
- a shaped wall having a thickness of at least 100μ
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7. A device for controlled delivery of a beneficial agent to an aqueous containing environment, said device comprising:
- a shaped wall having a thickness of at least 100μ
m that surrounds and defines an internal reservoir;
said wall at least in part permeable to the aqueous environment and said wall formed at least in part of a material permeable to a beneficial agent-containing hydrophobic medium when the wall is present in the aqueous containing environment and said wall formed at least in part of a sintered polymer microporous membrane permeable to the aqueous containing environment, said sintered polymer impregnated with a low vapor pressure hydrophilic medium; and
said reservoir containing a mixture of a hydrophilic swellable composition and said beneficial agent-containing hydrophobic medium, said beneficial agent being insoluble or partially insoluble in said aqueous containing environment.
- a shaped wall having a thickness of at least 100μ
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8. A device for controlled delivery of a beneficial agent to an aqueous containing environment, said device comprising:
- a shaped wall having a thickness of at least 100μ
m that surrounds and defines an internal reservoir;
said wall at least in part permeable to the aqueous environment and said wall formed at least in part of a material permeable to a beneficial agent-containing hydrophobic medium when the wall is present in the aqueous containing environment and said wall formed at least in part of a sintered polymer microporous membrane permeable to the aqueous containing environment, said sintered polymer impregnated with a hydrogel and wetted with a low vapor pressure hydrophilic medium; and
said reservoir containing a mixture of a hydrophilic swellable composition and said beneficial agent-containing hydrophobic medium, said beneficial agent being insoluble or partially insoluble in said aqueous containing environment.
- a shaped wall having a thickness of at least 100μ
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9. A device for controlled delivery of a beneficial agent to an aqueous containing environment, said device comprising:
- a shaped wall having a thickness of at least 100 μ
m that surrounds and defines an internal reservoir;
said wall at least in part permeable to the aqueous environment and said wall formed at least in part of a material permeable to a beneficial agent-containing hydrophobic medium when the wall is present in the aqueous containing environment; and
said reservoir containing sufficient air to achieve a predetermined time lag release and a mixture of a hydrophilic swellable composition and said beneficial agent-containing hydrophobic medium, said beneficial agent being insoluble or partially insoluble in said aqueous containing environment.
- a shaped wall having a thickness of at least 100 μ
Specification