Rupturing controlled release device having a preformed passageway
First Claim
1. A rupturing controlled release device comprising:
- a) a core comprising an active agent and, optionally, at least one excipient, and b) a wall enclosing the core and having a weakened section and a preformed passageway there through, wherein the wall ruptures at the weakened section during use due to an increase of internal osmotic pressure of the core during use of the device to form a second passageway by breakage of the wall at a location spaced away from the preformed passageway such that active agent is released over an extended period of time from both passageways.
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Accused Products
Abstract
The present invention provides a simple and improved osmotic device that is capable of providing a controlled release of active agent contained in the core first through a preformed passageway and then through an in situ formed second passageway into an environment of use. One or both of the passageways optionally increases in size during use of the osmotic device. The preformed passageway and/or the second passageway increase the release rate of the active agent, enable the release of large particles containing active agent, and/or enable the release of active agents that are substantially insoluble in the environment of use. By virtue of the in situ formation of the second aperture, the device is able to release a greater overall percentage of active agent than it would release in absence of the second aperture.
72 Citations
60 Claims
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1. A rupturing controlled release device comprising:
- a) a core comprising an active agent and, optionally, at least one excipient, and b) a wall enclosing the core and having a weakened section and a preformed passageway there through, wherein the wall ruptures at the weakened section during use due to an increase of internal osmotic pressure of the core during use of the device to form a second passageway by breakage of the wall at a location spaced away from the preformed passageway such that active agent is released over an extended period of time from both passageways.
- View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 58, 59, 60)
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39. A method of preparing during use a coated controlled release device comprising a core comprising at least one active agent and, optionally, at least one excipient, a single or multi-layered wall enveloping the core, a preformed passageway in the wall, and a second passageway formed by breakage of a weakened section in the wall at a location spaced away from the preformed passageway due to an increase of internal pressure of the core during use, the method comprising the steps of:
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a) providing a coated controlled release device comprising a core comprising;
at least one active agent and, optionally, at least one excipient, a single or multi-layered wall enveloping the core, wherein at least one of the layers of the wall retains its physical integrity during release of active agent from the core of the device, a weakened section in the wall, and a preformed passageway through at least one layer of the wall, wherein the layer of the wall that comprises the preformed passageway is adapted to rupture and form the second passageway during use of the device; andb) exposing the device to an environment of use in which fluid is absorbed into the device thereby increasing the internal osmotic pressure within the device and causing breakage of the weakened section in the wall to form the second passageway at a location spaced away from the preformed passageway.
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40. A method for treating a symptom, disorder and/or disease with at least one active agent, the method comprising the steps of:
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a) providing at least one coated controlled release device comprising a core that comprises at least one active agent and, optionally, at least one excipient and that is substantially enclosed within a wall comprising a preformed passageway and a weakened section in the wall, wherein the weakened section of the wall is adapted to rupture during use of the device to form a second passageway at a region spaced away from the preformed passageway; and b) administering the device to a subject in need of such treatment such that the at least one active agent is released for a first period of time through the preformed passageway and then, after formation of the second passageway formed by tearing of the wall due to an increase of internal pressure of the core during use, the at least one active agent is released for a second period of time through one or both passageways.
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Specification