Osmotic delivery system and method for enhancing start-up and performance of osmotic delivery systems
First Claim
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1. An osmotic drug delivery device comprising:
- a capsule including a first chamber containing a beneficial agent and a second chamber containing an osmotic agent, said first chamber having an opening through which the beneficial agent may be delivered from the first chamber to a location external of the first chamber;
a movable separating member positioned in the capsule between the first chamber and the second chamber;
a wall of the second chamber including a fluid permeable portion allowing fluid to pass from a surrounding environment into the second chamber; and
an incompressible fluid additive located within the second chamber and substantially surrounding the osmotic agent.
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Abstract
The present invention relates to an osmotically driven agent delivery system for delivering a beneficial agent. The osmotic delivery system includes an osmotic agent which operates by imbibing fluid from an outside environment, causing the release of a beneficial agent. The osmotic delivery system includes a liquid or gel additive surrounding the osmotic agent for enhancing start-up and lubricating the osmotic agent. The liquid or gel additive is an incompressible lubricating fluid which fills any air gaps between the osmotic agent and the walls of a chamber and substantially reduces start-up delays.
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Citations
23 Claims
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1. An osmotic drug delivery device comprising:
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a capsule including a first chamber containing a beneficial agent and a second chamber containing an osmotic agent, said first chamber having an opening through which the beneficial agent may be delivered from the first chamber to a location external of the first chamber; a movable separating member positioned in the capsule between the first chamber and the second chamber; a wall of the second chamber including a fluid permeable portion allowing fluid to pass from a surrounding environment into the second chamber; and an incompressible fluid additive located within the second chamber and substantially surrounding the osmotic agent. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. An osmotic drug delivery device comprising:
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an enclosure holding at least one osmotic agent tablet which imbibes fluid from a surrounding environment and swells to cause delivery of a beneficial agent; and an incompressible fluid filler located within the enclosure and at least partially surrounding the osmotic agent tablet. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18, 19, 20)
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21. A method of improving start-up time of an osmotic drug delivery system that includes an enclosure, an osmotic agent tablet provided within the enclosure, and a gap between an inner surface of the enclosure and an outer surface of the osmotic agent tablet, comprising the step of removing gas between the outer surface of the osmotic agent tablet and the inner surface of the enclosure by providing an incompressible fluid in the gap.
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22. An osmotic drug delivery device comprising:
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an enclosure; a partition dividing the enclosure so as to define a first chamber located on a first side of the partition and a second chamber located on a second side of the partition opposite from the first side, the first chamber holding a beneficial agent and the second chamber holding an osmotic agent, a portion of the enclosure that defines the first chamber being substantially impermeable to fluids, another portion of the enclosure that defines at least a part of the second chamber being permeable to fluids, the osmotic agent for imbibing fluid from a surrounding environment through said another portion of the enclosure and for swelling to cause delivery of the beneficial agent; and an incompressible fluid filler located within the second chamber and at least partially surrounding the osmotic agent. - View Dependent Claims (23)
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Specification