US4452785A
Expired / Lapsed
US
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Method for the therapeutic occlusion
Assignee: TRITON CHITO
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Filing: 1983-08-12
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Granted: 1984-06-05
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Expires: 2003-08-12
Abstract
Abstract A method of occluding blood vessels therapeutically is described wherein chitosan is injected directly into the vessel. The chitosan employed in this invention is partially to fully de-acetylated chitin. The chitin is dissolved in solution with distilled water and acetic acid and has a pH of approximately 4.
Inventors
- 👤 William G. Malette
- 👤 Herbert J. Quigley, Jr.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 12:21
CPC Classifications
A; A61; A61L; A61L15/00; A61L15/16; A61L15/22; A61L15/28; A61P; A61P7/00; A61P7/04; A61L2430/00; A61L2430/36
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
21 words
The method of occluding a blood vessel therapeutically by the intravascular injection of an effective amount of chitosan into the vessel.
Claim 2
Independent Claim
21 words
The method of occluding a blood vessel therapeutically by the intravascular injection of an effective amount of chitosan into the vessel.
Claim 3
Dependent Claim
14 words
The method of claim 1 wherein said chitosan comprises partially to fully de-acetylated chitin.
Claim 4
Dependent Claim
13 words
The method of claim 1 wherein said chitosan is dissolved in a solution.
Claim 5
Dependent Claim
16 words
The method of claim 3 wherein said solution is formed by dissolving a salt of chitosan.
Claim 6
Dependent Claim
24 words
The method of claim 1 wherein said chitosan is in solution with distilled water and acetic acid and has a pH of approximately 4.
References Cited (Backward Citations)
US3911116A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1987-06-05 | 1987-12-05 | 1988-06-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-06-05 | 1991-12-05 | 1992-06-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-06-05 | 1995-12-05 | 1996-06-05 | $7700.00 | Window Closed / Lapsed |