Reaction chamber unit for test strips

• US 3,884,641 A
• Filed: 06/07/1973
• Issued: 05/20/1975
• Est. Priority Date: 10/11/1972
• Status: Expired due to Term

• Current Assignee: Friedrich Kraffczyk, Roland Helger
• Original Assignee: Friedrich Kraffczyk, Roland Helger
• Inventors: Kraffczyk, Friedrich, Helger, Roland
• Primary Examiner(s): Scovronek, Joseph
• Application Number:
  US05/367,951
• Time in Patent Office: 712 Days
• Field of Search: 23/253R,253TP,254R,259,292 312/31.1,31.3,33R 220/41 206/305,42 195/127,139US
• US Class Current: 435/287.9
• CPC Class Codes: B01L 2300/045 whereby the whole cover is slidable
• CPC Class Codes: B01L 2300/0825 Test strips
• CPC Class Codes: B01L 9/52 Supports specially adapted for flat sample carriers, e.g. for plates, slides, chips
• CPC Class Codes: G01N 33/48742 Determining urea by measuring the volume of a gas in general G01N7/14 - G01N7/18
• CPC Class Codes: Y10S 435/805 Test papers
• CPC Class Codes: Y10S 435/807 Gas detection apparatus

Abstract

A reaction chamber unit for test strips having one or more reaction and indicator zones for the analytical determination of reactions involving gas evolution, consisting of a slide tray which is open at the top and at one end for receiving the test strip, and a housing which is open at one end and the bottom to receive the slide tray, the tray and housing having inclined guide means to facilitate positioning the slide tray tightly against the inner upper surface of the housing and produce a receptacle for the test strips of defined volume and spacing between the tray bottom and the opposite surface of the cover. At least the housing is formed of clear plastic to permit viewing the indicator zone without disturbing the test strip.

Claims

1. A REACTION CHAMBER UNIT FOR TEST STRIPS, COMPRISING A SLIDE TRAY WHICH IS OPEN AT THE TOP AND AT ONE END, AND HAS A PLANAR LOWER SURFACE FOR RECEIVING THE TEST STRIP, A HOUSING FOR SAID TRAY FORMED OF A CLEAR PLASTIC WHICH IS OPEN AT THE BOTTOM AND AT ONE END FOR RECEIVING SAID TRAY, THE INNER UPPER SURFACE OF SAID HOUSING BEING PLANAR, PARALLEL TO SAID PLANAR LOWER SURFACE OF SAID TRAY, SAID PLANAR SURFACES HAVING A PRECISE, PREDETERMINED DISTANCE OF SEPARATION OF ABOUT 2-10 MM. WHEN SAID TRAY IS PROPERLY POSITIONED IN SAID HOUSING,. AND GUIDE MEANS FOR GUIDING SAID TRAY INTO A PRECISE FIT IN SAID HOUSING, SAID GUIDE MEANS COMPRISING A PAIR OF DIAGONALLY EXTENDING SHOULDERS ON THE OUTSIDE SURFACE OF THE SIDE WALLS OF SAID TRAY AND A PAIR OF COOPERATIVELY ENGAGING CORRESPONDING DIAGONAL SHOULDERS ON THE INSIDE FACE OF THE SIDE WALLS OF SAID HOUSING, WHEREBY SAID PLANAR SURFACES ARE AUTOMATICALLY DRAWN INTO PRECISE SPATIAL RELATIONSHIP BY THE ENTRY IF SAID TRAY INTO SAID HOUSING.

2. A reaction chamber unit according to claim 1, wherein said slide tray is open at the same end as said housing.

3. A reaction chamber unit according to claim 1, wherein said slide tray extends beyond said housing when fully inserted therein for facilitating the gripping of the tray.

4. A reaction chamber unit according to claim 1, wherein said housing has a plurality of downward projecting sides joined to a common top forming, when a corresponding number of trays are inserted therein, a plurality of parallel positioned reaction chamber units.

5. A reaction chamber unit for test strips, comprising a slide tray which is open at the top and at one end, and has a planar lower surface for receiving the test strip, a housing for said tray formed of a clear plastic which is open at the bottom and at one end for receiving said tray, the inner upper surface of said housing being planar, parallel to said planar lower surface of said tray, said planar surfaces having a precise, predetermined distance of separation when said tray is properly positioned in said housing, and guide means for guiding said tray into a precise fit in said housing, said guide means comprising a pair of diagonally extending shoulders on the outside surface of the side walls of said tray and a pair of cooperatively engaging corresponding diagonal shoulders on the inside face of the side walls of said housing, whereby said planar surfaces are automatically drawn into precise spatial relationship by the entry of said tray into said housing, said slide tray being open at the same end as said housing, and wherein said slide tray has a portion extending beyond said housing when fully inserted therein, and said extending portion is serrated for facilitating the gripping of the tray.

6. A reaction chamber unit for test strips, comprising a slide tray which is open at the top and at one end, and has a planar lower surface for receiving the test strip, a housing for said tray formed of a clear plastic which is open at the bottom and at one end for receiving said tray, the inner upper surface of said housing being planar, parallel to said planar lower surface of said tray, said planar surfaces having a precise, predetermined distance of separation when said tray is properly positioned in said housing, and guide means for guiding said tray into a precise fit in said housing, said guide means comprising a pair of diagonally extending shoulders on the outside surface of the side walls of said tray and a pair of cooperatively engaging corresponding diagonal shoulders on the inside faces of the side walls of said housing, whereby said planar surfaces are automatically drawn into precise spatial relationship by the entry of said tray into said housing and wherein said housing has a plurality of downward projecting sides joined to a common top forming, when corresponding trays are inserted therein, a plurality of parallel positioned reaction chamber units, and wherein each of said slide trays is open at the same end as said housing, and wherein said slide trays have portions extending beyond said housing when fully inserted therein, and said extending portions are serrated for facilitating the gripping of the trays.