US 4,018,653 A · Instrument for the detection of Neisseria gonorrhoeae without culture

Abstract

A non-culture method and instrument for a rapid presumptive test for gonorrhea in which a specimen of exudate from a suspected case is placed in direct contact with a pledget containing a compound which reacts with Neisseria gonorrhoeae to produce a color change. The pledget, before the test, is in a dry condition and is activated by a wetting agent such as saline, when placed in contact with the pledget. The chemical compound used and incorporated into the pledget is selected from a group consisting of phenylenediamines. The instrument used consists of a flexible tube containing a fluid-filled frangible ampul at one end and the chemically impregnated pledget disposed immediately above same. A separate sterile swab is supplied for taking the specimen. The swab containing the specimen is inserted into the flexible tube. The flexible tube is then squeezed at the ampul portion, releasing the wetting agent by breaking the frangible ampul. The wetting agent when thus released activates the reagents in the pledget. A downward pressure of the swab containing the specimen places it in direct contact with the activated pledget. If gonorrhea is present in the specimen on the swab, a distinctive coloration of the specimen takes place within two minutes.

Claims4

Dependent claims

A swabbing instrument for use in the rapid detection of Neisseria gonorrhoeae without gram-staining and without culture by providing an initial distinctive color change on the swab of the instrument after collecting an inoculum on the swab, said instrument consisting essentially of:

a stick for the swab used to collect the inoculum;
a sterile swab mounted on said stick for obtaining a clinical specimen of said Neisseria from the penis as an exudate and the only inoculum of bacteria at the collection site from the patient;
a tube of transparent plastic having flexible side walls and a closed end into which the swab and inoculum are inserted by the stick;
A dry substantially colorless pledget disposed in said tube which is impregnated with a dilute colorless solution of N, N, N' N' tetramethyl-p-phenylenediamine dihydrochloride in alcohol which has been dried;
a frangible ampul containing a wetting activating agent for said tetramethyl-p-phenylenediamine compound in said tube;
said dry pledget placed above said ampul and reacting when wetted after breaking of said ampul to wet said swab without coloration but to react with Neisseria gonorrhoeae in the inoculum on said swab to produce a distinctive initial color change;
said wetting activating agent constituting the sole liquid agent to activate said dry pledget and said agent being selected from the group consisting of water, physiological saline, and aqueous buffer solutions at pH 6.5 to 7.2;
and,
said initial distinctive color change being a purple shade produced on the inoculum on said swab at the site of collection of the bacteria, after said clinical specimen of exudate is taken from the patient and the swab is placed on the wetted pledget, wetted with said activating agent, and within two minutes to be directly indicative of Neisseria gonorrhoeae bacteria in said specimen.

6 more elements

a stick for the swab used to collect the inoculum;
a sterile swab mounted on said stick for obtaining a clinical specimen of said Neisseria from the penis as an exudate and the only inoculum of bacteria at the collection site from the patient;
a tube of transparent plastic having flexible side walls and a closed end into which the swab and inoculum are inserted by the stick;
a dry substantially colorless pledget disposed in said tube which is impregnated with a dilute colorless solution in alcohol of a phenylenediamine agent selected from the group consisting of p-amino dimethylaniline oxalate, N, N-dimethyl-p-phenylenediamine dichloride, N, N-dimethyl-p-phenylene-diamine oxalate, N, N-dimethyl-p-phenylenediamine monohydrochloride and N, N, N' N' tetramethyl-p-phenylenediamine dihydorchlide which has been dried:
a frangible ampul containing a wetting activating agent for said phenylenediamine agent in said tube;
said dry pledget placed above said ampul and reacting when wetted after breaking of said ampul to wet said swab without coloration but to react with Neisseria gonorrhoeae in the inoculum on said swab to produce a distinctive initial color change;
said wetting activating agent constituting the sole liquid agent to activate said dry pledget and said agent being selected from the group consisting of water, physiological saline, and aqueous buffer solutions at pH 6.5 to 7.2;
and,
said initial distinctive color change being a purple shade produced on the inoculum on said swab at the site of collection of the bacteria, after said clinic specimen of exudate is taken from the patient and the swab is placed on the wetted pledget, wetted with said activating agent, and within two minutes to be directly indicative of Neisseria gonorrhoeae bacteria in said specimen.

6 more elements

Dependencies are inferred from the claim text.

Instrument for the detection of Neisseria gonorrhoeae without culture

Life of this patent

Instrument for the detection of Neisseria gonorrhoeae without culture

Life of this patent

Abstract

Claims4