Patent US4478596A successfully refreshed from Google Patents.
US4478596A
Expired / Lapsed
US
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Delivery system for physiologically active agents
Assignee: Individual
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Filing: 1982-11-26
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Granted: 1984-10-23
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Expires: 2002-11-26
Abstract
Abstract A system for the controlled delivery of a physiologically active agent to a fluid environment having a semipermeable sheath with a plurality of pores, the sheath being imperforate except for the plurality of pores and defining a fully enclosed cavity for holding a physiologically active agent. A physiologically active agent is contained in the fully enclosed cavity for delivery to a fluid environment, with the plurality of pores being of a size to permit both the flow of fluid from the fluid environment through the semipermeable sheath into the cavity and the flow of fluid and physiologically active agent in solution out of the cavity into the fluid environment whereby the physiologically active agent is delivered from the semipermeable sheath exclusively through the plurality of pores.
Inventors
- 👤 Paul E. Michelson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 20:02
CPC Classifications
A; A61; A61F; A61F2/00; A61F2/02; A61F2/14; A61F2/16; A61F2/1613; A61F2/1616; G; G09; G09B; G09B23/00; G09B23/28; G09B23/30
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
188 words
A system for the controlled delivery of a physiologically active agent to a fluid environment comprising: a semipermeable sheath defining a fully enclosed cavity and being imperforate except for a plurality of pores for permitting the flow of fluid from the fluid environment into said cavity; and a quanitity of a molecular complex positioned in said cavity, said molecular complex comprising a macromolecule that is nondiffusable with respect to said sheath and a physiologically active agent complexed to said macromolecule, said physiologically active agent being capable of dissociating from said macromolecule over time and going into solution with the fluid in said cavity, and said pores having a larger size in relation to said physiologically active agent and said sheath being so constructed as to permit unimpeded passage of said physiologically active agent through said pores out of said cavity, wherein the concentration of said physiologically active agent within said cavity is controlled by the equilibrium between said molecular complex and said physiologically active agent within said cavity and said physiologically active agent is deliverable by said system to the fluid environment exclusively through said plurality of pores.
Claim 2
Independent Claim
188 words
A system for the controlled delivery of a physiologically active agent to a fluid environment comprising: a semipermeable sheath defining a fully enclosed cavity and being imperforate except for a plurality of pores for permitting the flow of fluid from the fluid environment into said cavity; and a quanitity of a molecular complex positioned in said cavity, said molecular complex comprising a macromolecule that is nondiffusable with respect to said sheath and a physiologically active agent complexed to said macromolecule, said physiologically active agent being capable of dissociating from said macromolecule over time and going into solution with the fluid in said cavity, and said pores having a larger size in relation to said physiologically active agent and said sheath being so constructed as to permit unimpeded passage of said physiologically active agent through said pores out of said cavity, wherein the concentration of said physiologically active agent within said cavity is controlled by the equilibrium between said molecular complex and said physiologically active agent within said cavity and said physiologically active agent is deliverable by said system to the fluid environment exclusively through said plurality of pores.
Claim 3
Dependent Claim
16 words
The system of claim 1 wherein said sheath has a thickness of less than 50 microns.
Claim 4
Dependent Claim
16 words
The system of claim 1 wherein the diameter of said pores is less than 1,000 Angstroms.
Claim 5
Dependent Claim
21 words
The system of claim 1 wherein said sheet has a pore density between 100 and 10 10 pores per square cm.
Claim 6
Dependent Claim
19 words
The system of claim 1 wherein said pores are sufficiently small to prevent the passage therethrough of said macromolecule.
Claim 7
Dependent Claim
15 words
The system of claim 1 wherein said sheath is transparent and said macromolecule is photostable.
Claim 8
Dependent Claim
10 words
The system of claim 1 wherein said macromolecule is inert.
Claim 9
Dependent Claim
22 words
The system of claim 1 wherein said macromolecule is selected from a group consisting of protein, cellulose, carbohydrate, rubber or high polymer.
Claim 10
Dependent Claim
194 words
A drug delivery system for immersion in a physiological fluid comprising: a semipermeable sheath defining a fully enclosed cavity and having a plurality of pores for permitting the physiological fluid to flow into and out of said cavity, said sheath being imperforate except for said pores; and a quantity of a molecular complex disposed in said cavity, said molecular complex comprising a macromolecule and a drug complexed to said macromolecule which, overtime, dissociates from said macromolecule to create a free drug and an uncomplexed macromolecule both of which go into solution with the fluid in said cavity, said uncomplexed macromolecule being larger than the pores in said sheath and thereby prevented from leaving said said cavity and said pores being larger in size in relation to said free drug and said sheath being so contructed as to premit said free drug to pass unimpeded through said pores for delivery to the physiological fluid surrounding said sheath; wherein the fluid flows into the cavity under the influence of osmotic pressure and the concentration of free drug within said cavity is controlled by the equilibrium between said molecular complex and said free drug within said cavity.
Claim 11
Dependent Claim
194 words
A drug delivery system for immersion in a physiological fluid comprising: a semipermeable sheath defining a fully enclosed cavity and having a plurality of pores for permitting the physiological fluid to flow into and out of said cavity, said sheath being imperforate except for said pores; and a quantity of a molecular complex disposed in said cavity, said molecular complex comprising a macromolecule and a drug complexed to said macromolecule which, overtime, dissociates from said macromolecule to create a free drug and an uncomplexed macromolecule both of which go into solution with the fluid in said cavity, said uncomplexed macromolecule being larger than the pores in said sheath and thereby prevented from leaving said said cavity and said pores being larger in size in relation to said free drug and said sheath being so contructed as to premit said free drug to pass unimpeded through said pores for delivery to the physiological fluid surrounding said sheath; wherein the fluid flows into the cavity under the influence of osmotic pressure and the concentration of free drug within said cavity is controlled by the equilibrium between said molecular complex and said free drug within said cavity.
References Cited (Backward Citations)
US3426754A
Cited
US3967618A
Cited
CA990164A
Cited
US3832458A
Cited
US4077407A
Cited
US4322398A
Cited
US4265874A
Cited
US4309996A
Cited
US4298003A
Cited
US4314557A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1987-10-23 | 1988-04-23 | 1988-10-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-10-23 | 1992-04-23 | 1992-10-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-10-23 | 1996-04-23 | 1996-10-23 | $7700.00 | Window Closed / Lapsed |