Patent US4666704A successfully refreshed from Google Patents.
US4666704A
Expired / Lapsed
US
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Controlled release delivery system for macromolecules
Assignee: International Minerals and Chemical Corp
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Filing: 1985-05-24
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Granted: 1987-05-19
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Expires: 2005-05-24
Abstract
Abstract A controlled release implant composition which includes a core comprising a macromolecular drug and a water insoluble polymer and a homogeneous outer polymeric membrane formed by coating said core with an organic solution of a water insoluble polymer and a water soluble pore-forming agent.
Inventors
- 👤 Mohamad D. Shalati
- 👤 Kallidaikurichi N. Sivaramakrishnan
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 13:40
CPC Classifications
A; A61; A61K; A61K9/00; A61K9/48; A61K9/20; A61K9/2004; A61K9/2022; A61K9/2031; A61K9/204; A61K9/0012; A61K9/0019; A61K9/0024; A61K9/28; A61K9/2806; A61K9/2833; A61K9/2853; Y; Y10; Y10S; Y10S424/00; Y10S424/07
Claims Analysis
Total Claims: 22
Claim 1
Independent Claim
74 words
An implant composition which provides controlled release of a macromolecular drug at a substantially constant rate, said composition comprising a core of the macromolecular drug and a water insoluble polymer; and a homogeneous pore-forming outer polymeric membrane having a uniform distribution of pore-forming agents, said membrane formed by coating said core with a homogeneous solution of (a) an organic solvent, (b) a water insoluble high molecular weight polymer and (c) water soluble pore-forming agent.
Claim 2
Dependent Claim
74 words
An implant composition which provides controlled release of a macromolecular drug at a substantially constant rate, said composition comprising a core of the macromolecular drug and a water insoluble polymer; and a homogeneous pore-forming outer polymeric membrane having a uniform distribution of pore-forming agents, said membrane formed by coating said core with a homogeneous solution of (a) an organic solvent, (b) a water insoluble high molecular weight polymer and (c) water soluble pore-forming agent.
Claim 3
Dependent Claim
20 words
The composition of claim 1 wherein said macromolecular drug is a native or recombinant bioactive protein or an analog thereof.
Claim 4
Dependent Claim
18 words
The composition of claim 2 wherein said protein is native porcine growth hormone or a recombinant analog thereof.
Claim 5
Dependent Claim
18 words
The composition of claim 1 wherein said macromolecular drug has a molecular weight of at least about 2000.
Claim 6
Dependent Claim
21 words
The composition of claim 1 wherein said core polymer is selected from the group consisting of polylactic acid, ethylcellulose, and polycaprolactone.
Claim 7
Dependent Claim
23 words
The composition of claim 1 wherein said water soluble pore-forming agent is selected from the group consisting of dimethyl tartrate and diethyl tartrate.
Claim 8
Dependent Claim
29 words
The composition of claim 1 wherein said water insoluble, high molecular weight polymer in said polymeric membrane is selected from the group consisting of polylactic acid, ethylcellulose and polycaprolactone.
Claim 9
Independent Claim
85 words
A method of preparing an implant composition which provides controlled release of a macromolecular drug at a substantially constant rate which comprises: (a) forming a mixture of said macromolecular drug and a water insoluble polymer into a pellet; (b) coating said pellet with a homogeneous solution of (i) an organic solvent, (ii) a water insoluble high molecular weight polymer and (iii) a water soluble pore-forming agent; and (c) evaporating said organic solvent thereby forming an outer polymeric membrane having a uniform distribution of pore-forming agents.
Claim 10
Independent Claim
85 words
A method of preparing an implant composition which provides controlled release of a macromolecular drug at a substantially constant rate which comprises: (a) forming a mixture of said macromolecular drug and a water insoluble polymer into a pellet; (b) coating said pellet with a homogeneous solution of (i) an organic solvent, (ii) a water insoluble high molecular weight polymer and (iii) a water soluble pore-forming agent; and (c) evaporating said organic solvent thereby forming an outer polymeric membrane having a uniform distribution of pore-forming agents.
Claim 11
Dependent Claim
20 words
The method of claim 8 wherein said macromolecular drug is a native or recombinant bioactive protein or an analog thereof.
Claim 12
Dependent Claim
18 words
The method of claim 9 wherein said protein is native porcine growth hormone or a recombinant analog thereof.
Claim 13
Dependent Claim
18 words
The method of claim 8 wherein said macromolecular drug has a molecular weight of at least about 2000.
Claim 14
Dependent Claim
21 words
The method of claim 8 wherein said core polymer is selected from the group consisting of polylactic acid, ethylcellulose, and polycaprolactone.
Claim 15
Dependent Claim
23 words
The method of claim 8 wherein said water soluble pore-forming agent is selected from the group consisting of dimethyl tartrate and diethyl tartrate.
Claim 16
Dependent Claim
29 words
The method of claim 8 wherein said water insoluble, high molecular weight polymer in said polymeric membrane is selected from the group consisting of polylactic acid, ethylcellulose and polycaprolactone.
Claim 17
Dependent Claim
23 words
A method of treating an animal with the controlled release composition of claim 1 wherein said composition is subcutaneously implanted in said animal.
Claim 18
Dependent Claim
23 words
A method of treating an animal with the controlled release composition of claim 2 wherein said composition is subcutaneously implanted in said animal.
Claim 19
Dependent Claim
23 words
A method of treating an animal with the controlled release composition of claim 3 wherein said composition is subcutaneously implanted in said animal.
Claim 20
Dependent Claim
23 words
A method of treating an animal with the controlled release composition of claim 4 wherein said composition is subcutaneously implanted in said animal.
Claim 21
Dependent Claim
23 words
A method of treating an animal with the controlled release composition of claim 6 wherein said composition is subcutaneously implanted in said animal.
Claim 22
Dependent Claim
23 words
A method of treating an animal with the controlled release composition of claim 7 wherein said composition is subcutaneously implanted in said animal.
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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) | 1990-05-18 | 1990-11-17 | 1991-05-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-05-18 | 1994-11-17 | 1995-05-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-05-18 | 1998-11-17 | 1999-05-19 | $7700.00 | Window Closed / Lapsed |