Patent US4449983A successfully refreshed from Google Patents.
US4449983A
Expired / Lapsed
US
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Simultaneous delivery of two drugs from unit delivery device
Assignee: Alza Corp
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Filing: 1982-03-22
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Granted: 1984-05-22
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Expires: 2002-03-22
Abstract
Abstract An osmotic device is disclosed for delivering two beneficial drugs to an environment of use. The device comprises a wall surrounding a lumen divided into a first compartment containing a drug that is separated by a hydrogel partition from a second compartment containing a different drug. An orifice through the wall communicates with the first compartment for delivering drug formulation from the first compartment, and another orifice through the wall communicates with the second compartment for delivering drug formulation from the second compartment. In operation, drug formulation is dispensed separately from each compartment by fluid being imbibed through the wall into each compartment at a rate controlled by the permeability of the wall and the osmotic pressure gradient across the wall against the drug formulation in each compartment thereby producing in each compartment a solution containing drugs, and by the expansion and swelling of the hydrogel, whereby drug formulation is dispensed through their orifices at a controlled and continuous rate over a prolonged period of time.
Inventors
- 👤 Richard Cortese
- 👤 Brian Barclay
- 👤 Felix Theeuwes
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 19:03
CPC Classifications
A; A61; A61K; A61K9/00; A61K9/0002; A61K9/0004
Claims Analysis
Total Claims: 20
Claim 1
Independent Claim
193 words
An osmotic therapeutic device for the controlled delivery of beneficial drugs to a biological environment, the device consisting essentially of: (a) a wall formed of a semipermeable material permeable to the passage of an external fluid present in the environment and substantially impermeable to the passage of drug, the semipermeable wall surrounding and forming; (b) a first compartment containing a drug formulation that exhibits an osmotic pressure gradient across the semipermeable wall against an external fluid; (c) a second compartment containing a drug formulation that exhibits an osmotic pressure gradient across the semipermeable wall against an external fluid; (d) a partition positioned between the first and second compartments, which partition is formed of a hydrogel that expands in the presence of fluid; (e) a first orifice in the wall communicating with the first compartment and the exterior of the device for delivering drug formulation from the first compartment to the environment over a prolonged period of time; and, (f) a second orifice in the wall communicating with the second compartment and the exterior of the device for delivering drug formulation from the second compartment to the environment over a prolonged period of time.
Claim 2
Dependent Claim
193 words
An osmotic therapeutic device for the controlled delivery of beneficial drugs to a biological environment, the device consisting essentially of: (a) a wall formed of a semipermeable material permeable to the passage of an external fluid present in the environment and substantially impermeable to the passage of drug, the semipermeable wall surrounding and forming; (b) a first compartment containing a drug formulation that exhibits an osmotic pressure gradient across the semipermeable wall against an external fluid; (c) a second compartment containing a drug formulation that exhibits an osmotic pressure gradient across the semipermeable wall against an external fluid; (d) a partition positioned between the first and second compartments, which partition is formed of a hydrogel that expands in the presence of fluid; (e) a first orifice in the wall communicating with the first compartment and the exterior of the device for delivering drug formulation from the first compartment to the environment over a prolonged period of time; and, (f) a second orifice in the wall communicating with the second compartment and the exterior of the device for delivering drug formulation from the second compartment to the environment over a prolonged period of time.
Claim 3
Dependent Claim
147 words
The osmotic therapeutic device for the controlled delivery of beneficial drugs according to claim 1, wherein when the device is in operation in the environment of use, fluid from the environment is imbibed through the wall into (1) the first compartment in a tendency towards osmotic equilibrium at a rate determined by the permeability of the wall and the osmotic pressure gradient across the wall, thereby forming a solution containing drug that is delivered through the first orifice from the device at a controlled rate over a prolonged period of time, and into (2) the second compartment in a tendency towards osmotic equilibrium at a rate determined by the permeability of the wall and the osmotic pressure gradient across the wall, thereby forming a solution containing drug that is delivered through the second orifice from the device at a controlled rate over a prolonged period of time.
Claim 4
Dependent Claim
33 words
The osmotic therapeutic device for the controlled delivery of beneficial drugs according to claim 1, wherein the drug formulation in the first compartment comprises a dosage unit amount of drug and an osmagent.
Claim 5
Dependent Claim
33 words
The osmotic therapeutic device for the controlled delivery of beneficial drugs according to claim 1, wherein the drug formulation in the second compartment comprises a dosage unit amount of drug and an osmagent.
Claim 6
Dependent Claim
24 words
The osmotic therapeutic device for the controlled delivery of beneficial drugs according to claim 1, wherein the first and second compartments contain different drugs.
Claim 7
Dependent Claim
30 words
The osmotic therapeutic device for the controlled delivery of beneficial drugs according to claim 1, wherein the device is adapted for oral administration for delivering drugs to the gastrointestional tract.
Claim 8
Dependent Claim
47 words
The osmotic device for the controlled delivery of the beneficial drug according to claim 1 wherein the wall is formed of a member selected from the group consisting of cellulose acylate, cellulose diacylate, cellulose triacylate, cellulose acetate, cellulose diacetate and cellulose triacetate, ethylcellulose and cellulose acetate butyrate.
Claim 9
Dependent Claim
20 words
The osmotic device for the controlled delivery of a beneficial drug according to claim 1 wherein the hydrogel is cross-linked.
Claim 10
Dependent Claim
92 words
The osmotic device for the controlled delivery of beneficial drug according to claim 1, wherein the hydrogel can expand from a rested to an expanded state in the presence of exterior fluid imbibed into the osmotic device, whereby through the combined operations of the external fluid being imbibed through the wall into the first compartment and the second compartment, and the expanding hydrogel, solution containing drug is delivered through the first orifice and the second orifice from the first compartment and the second compartment to the exterior of the device over time.
Claim 11
Dependent Claim
185 words
An osmotic therapeutic device for the controlled delivery of beneficial drugs to a biological environment, the device consisting essentially of: (a) a laminated wall formed of a semipermeable lamina in laminar arrangement with a microporous lamina, the laminated wall surrounding and forming; (b) a first compartment containing a drug formulation that exhibits an osmotic pressure gradient across the laminated wall against an external fluid; (c) a second compartment containing a drug formulation that exhibits an osmotic pressure gradient across the laminated wall against an external fluid; (d) a partition positioned between the first compartment and the second compartment, which partition is formed of a hydrogel that expands in the presence of fluid; (e) a first orifice in the laminated wall communicating with the first compartment and the exterior of the device for delivering drug formulation from the first compartment to the environment over a prolonged period of time; and, (f) a second orifice in the laminated wall communicating with the second compartment and the exterior of the device for delivering drug formulation from the second compartment to the environment over a prolonged period of time.
Claim 12
Dependent Claim
185 words
An osmotic therapeutic device for the controlled delivery of beneficial drugs to a biological environment, the device consisting essentially of: (a) a laminated wall formed of a semipermeable lamina in laminar arrangement with a microporous lamina, the laminated wall surrounding and forming; (b) a first compartment containing a drug formulation that exhibits an osmotic pressure gradient across the laminated wall against an external fluid; (c) a second compartment containing a drug formulation that exhibits an osmotic pressure gradient across the laminated wall against an external fluid; (d) a partition positioned between the first compartment and the second compartment, which partition is formed of a hydrogel that expands in the presence of fluid; (e) a first orifice in the laminated wall communicating with the first compartment and the exterior of the device for delivering drug formulation from the first compartment to the environment over a prolonged period of time; and, (f) a second orifice in the laminated wall communicating with the second compartment and the exterior of the device for delivering drug formulation from the second compartment to the environment over a prolonged period of time.
Claim 13
Dependent Claim
148 words
The osmotic therapeutic device for the controlled delivery of beneficial drugs according to claim 10 wherein when the device is in operation in the environment of use, fluid from the environment is imbibed through the laminated wall into (1) the first compartment in a tendency towards osmotic equilibrium at a rate determined by the permeability of the wall and the osmotic pressure gradient across the wall, thereby forming a solution containing drug that is delivered through the first orifice from the device at a controlled rate over a prolonged period of time, and into (2) the second compartment in a tendency towards osmotic equilibrium at a rate determined by the permeability of the wall and the osmotic pressure gradient across the wall, thereby forming a solution containing drug that is delivered through the second orifice from the device at a controlled rate over a prolonged period of time.
Claim 14
Dependent Claim
103 words
The osmotic device for the controlled delivery of the beneficial drug according to claim 10, wherein the hydrogel expands from a rested to an expanded state in the presence of exterior fluid imbibed into the device, whereby through the combined operations of the exterior fluid being imbibed through the wall into the first compartment to form a solution containing drug, and into the second compartment to form a solution containing drug, drug is delivered through the first orifice and through the second orifice from the first compartment and the second compartment to the exterior of the device over a prolonged period of time.
Claim 15
Dependent Claim
33 words
The osmotic therapeutic device for the controlled delivery of beneficial drugs according to claim 10 wherein the drug formulation in the first compartment comprises a dosage unit amount of drug and an osmagent.
Claim 16
Dependent Claim
33 words
The osmotic therapeutic device for the controlled delivery of beneficial drugs according to claim 10 wherein the drug formulation in the second compartment comprises a dosage unit amount of drug and an osmagent.
Claim 17
Dependent Claim
24 words
The osmotic therapeutic device for the controlled delivery of beneficial drugs according to claim 10 wherein the first and second compartments contain different drugs.
Claim 18
Dependent Claim
30 words
The osmotic therapeutic device for the controlled delivery of beneficial drugs according to claim 10 wherein the device is adapted for oral administration for delivering drugs to the gastrointestional tract.
Claim 19
Dependent Claim
29 words
The osmotic therapeutic device for the controlled delivery of beneficial drugs according to claim 10 wherein the semipermeable lamina faces the compartments and the microporous lamina faces the environment.
Claim 20
Dependent Claim
29 words
The osmotic therapeutic device for the controlled delivery of beneficial drugs according to claim 10 wherein the microporous lamina faces the compartments and the semipermeable lamina faces the environment.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1987-05-22 | 1987-11-21 | 1988-05-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-05-22 | 1991-11-21 | 1992-05-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-05-22 | 1995-11-21 | 1996-05-22 | $7700.00 | Window Closed / Lapsed |