Patent US3944391A successfully refreshed from Google Patents.
US3944391A
Expired / Lapsed
US
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In vitro process for detecting endotoxin in a biological fluid
Assignee: Preventive Systems Inc
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Filing: 1974-12-27
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Granted: 1976-03-16
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Expires: 1994-12-27
Abstract
Abstract An in vitro process for detecting the presence of endotoxin in a biological fluid such as a parenteral fluid, whole blood, and the like, wherein amebocyte lysate from the hemolymph of the horseshoe crab, Limulus polyphemus, is intimately contacted with and incubated in the presence of a synthetic plastic polymer capable of adsorbing endotoxin which has previously been contacted with the biological fluid. The presence or absence of a gelation reaction in the amebocyte lysate is then observed. The presence of a gelation reaction determines the presence of endotoxin in the biological fluid.
Inventors
- 👤 Nick S. Harris
- 👤 Robert Feinstein
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 12:21
CPC Classifications
G; G01; G01N; G01N33/00; G01N33/48; G01N33/50; G01N33/579
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
105 words
An in vitro process for determining the presence or absence of endotoxin in a biological fluid, said process comprising: a. contacting said biological fluid with a non-ionogenic, hydrophobic, non-polar, aliphatic, synthetic plastic polymer whereby endotoxin present in the fluid is adsorbed by the synthetic plastic polymer; b. removing said synthetic plastic polymer from contact with the biological fluid; c. contacting the plastic polymer of (b) with amebocyte lysate from the hemolymph of the horseshoe crab, Limulus polyphemus; d. incubating the amebocyte lysate in contact with the synthetic plastic polymer of (c); and e. observing the presence or absence of gelation reaction in the amebocyte lysate.
Claim 2
Dependent Claim
105 words
An in vitro process for determining the presence or absence of endotoxin in a biological fluid, said process comprising: a. contacting said biological fluid with a non-ionogenic, hydrophobic, non-polar, aliphatic, synthetic plastic polymer whereby endotoxin present in the fluid is adsorbed by the synthetic plastic polymer; b. removing said synthetic plastic polymer from contact with the biological fluid; c. contacting the plastic polymer of (b) with amebocyte lysate from the hemolymph of the horseshoe crab, Limulus polyphemus; d. incubating the amebocyte lysate in contact with the synthetic plastic polymer of (c); and e. observing the presence or absence of gelation reaction in the amebocyte lysate.
Claim 3
Dependent Claim
49 words
The process of claim 1 wherein said amebocyte lysate in contact with the synthetic plastic polymer of (c) is incubated at a temperature within the range of from about 30° C. to about 40° for a time period within the range of from about 60 to about 90 minutes.
Claim 4
Dependent Claim
11 words
The process of claim 1 wherein said biological fluid is blood.
Claim 5
Dependent Claim
28 words
The process of claim 3 wherein the synthetic plastic polymer previously contacted with the blood is washed with a pyrogen-free liquid prior to contact with said amebocyte lysate.
Claim 6
Dependent Claim
79 words
The process of claim 1 wherein said non-ionogenic hydrophobic non-polar aliphatic synthetic plastic polymer capable of adsorbing endotoxin is a polymer selected from the group consisting of a substantially crystalline non-polar aliphatic hydrocarbon thermoplastic polymer, a substantially crystalline non-polar aliphatic thermoplastic fluorocarbon polymer, a cross-linked aliphatic silicone elastomeric polymer and mixtures thereof, said synthetic plastic polymer being previously intimately contacted with said biological fluid whereby endotoxin present in said biological fluid is adsorbed onto the surface of said polymer.
Claim 7
Dependent Claim
14 words
The process of claim 5 wherein said synthetic plastic polymer is a poly-α-olefin polymer.
Claim 8
Dependent Claim
15 words
The process of claim 5 wherein said synthetic plastic polymer is a thermoplastic fluorocarbon polymer.
Claim 9
Dependent Claim
14 words
The process of claim 5 wherein said synthetic plastic polymer is a cross-linked poly(alkyl-siloxane).
References Cited (Backward Citations)
US3794584A
Cited
US3770631A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1979-03-16 | 1979-09-15 | 1980-03-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-03-16 | 1983-09-15 | 1984-03-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-03-16 | 1987-09-15 | 1988-03-16 | $7700.00 | Window Closed / Lapsed |