Nylon strips for medical assay

• US 4,710,458 A
• Filed: 04/27/1981
• Issued: 12/01/1987
• Est. Priority Date: 09/17/1979
• Status: Expired due to Fees

• Current Assignee: R J Harvey Instruments Corporation
• Original Assignee: R J Harvey Instruments Corporation
• Inventors: Maines, Robert
• Primary Examiner(s): Turk, Arnold
• Application Number:
  US06/257,860
• Time in Patent Office: 2,409 Days
• Field of Search: 422/55, 422/56, 422/57, 435/4, 435/805, 435/14, 435/12, 435/19, 435/25, 435/28, 436/172
• US Class Current: 435/12
• CPC Class Codes: C12Q 1/00 Measuring or testing processes involving enzymes, nucleic acids or microorganisms measuring or testing apparatus with condition measuring or sensing means, e.g. colony counters, C12M1/34; Compositions therefor; Processes of preparing such compositions
• CPC Class Codes: G01N 21/03 Cuvette constructions
• CPC Class Codes: G01N 21/534 by measuring transmission alone, i.e. determining opacity
• CPC Class Codes: G01N 21/64 Fluorescence; Phosphorescence
• CPC Class Codes: G01N 21/643 non-biological material
• CPC Class Codes: G01N 33/52 Use of compounds or compositions for colorimetric, spectrophotometric or fluorometric investigation, e.g. use of reagent paper and including single- and multilayer analytical elements immunological elements G01N33/54386; involving labelled immunochemicals G01N33/58; for haemoglobin or occult blood G01N33/72
• CPC Class Codes: G01N 33/528 Atypical element structures, e.g. gloves, rods, tampons, toilet paper
• CPC Class Codes: Y10S 435/805 Test papers

Abstract

Photometric apparatus, for counting the particulate components in blood and for determining the degree of particulate agglutination is disclosed. The apparatus comprises a body provided with an absorbent well for holding the blood bearing solution. The body is further provided with a passage to allow communication between the well and a detector which is capable of detecting the response of the particulate material to stimulating radiation. The absorptive well has the characteristic of absorbing radiation at the wavelength which characterizes the response of the particulate material to stimulating radiation. The well advantageously prevents the detector from detecting radiation that would otherwise be reflected by the well, whereby the linearity of the response of the apparatus is greatly increased. Linearity is further enhanced by assuring full crenation of the cells with a specific reagent. Impregnation of the well walls with specific reagents and/or enzymes, such that the addition of water or solution will result in a working test solution for a variety of blood serum or urine analysis is further disclosed. Test strips impregnated with specific reagents and enzymes, which are adapted to produce a permanent record of the test color intensity, are also disclosed.

Claims

1. A test strip for quantitatively determining and permanently recording the concentration of analytes in solution, said test strip comprising a non-fibrous Nylon IV Strip having impregnated therein an enzyme and a plurality of test reagents, said enzyme and test reagents adapted to react with the analyte to produce a color, the intensity of which is indicative of said analyte concentration.

2. The test strip as recited in claim 1, wherein said enzyme is selected from the group consisting of glucose oxidase, lactate oxidase, pyruvate oxidase, glycerol oxidase, alcohol oxidase, urease, lipase and peroxidase.

3. The test strip as recited in claim 1, wherein said reagents are selected from the group consisting of 4-aminoantipyrine, 4-aminophenazone and the tetrazolium salts.

4. The test strip as recited in claim 1, wherein the Nylon IV strip has a thickness of about 0.25 mm to 2 mm.