Multilayered integral chemical analysis element for the blood

• US 4,256,693 A
• Filed: 06/06/1979
• Issued: 03/17/1981
• Est. Priority Date: 06/06/1978
• Status: Expired due to Term

• Current Assignee: Fuji Photo Film Co Limited (Fujifilm Holdings Corporation)
• Original Assignee: Fuji Photo Film Co Limited (Fujifilm Holdings Corporation)
• Inventors: Kitajima, Masao, Kondo, Asaji
• Primary Examiner(s): Marantz, Sidney
• Application Number:
  US06/046,125
• Time in Patent Office: 650 Days
• Field of Search: 422/56, 422/57, 435/805
• US Class Current: 422/422
• CPC Class Codes: G01N 33/525 Multi-layer analytical elements
• CPC Class Codes: Y10S 435/805 Test papers

Abstract

A multilayered integral chemical analysis element for the blood comprising a filter layer capable of removing formed components from the blood, a water-proof layer having at least one small opening therein, a porous spreading layer and a reagent layer laminated in this order.

Claims

1. A multilayered integral chemical analysis element for a blood sample, said element comprising a filter layer capable of removing formed components comprising leucocytes, erythrocytes and platelets in the blood, a water-proof layer having at least one small opening therein, a porous spreading layer, and a reagent layer laminated in this order.

2. The element of claim 1 which further comprises a support for maintaining the laminated state of said four layers.

3. The element of claim 1, wherein said small opening is circular or triangular, or is a cut in the form of *, +, or -.

4. The element of claim 1, wherein the number of said small openings is one per spot of blood sample, and said small opening is circular or triangular and ranges in size from about 30 μ

m to about 5 mm in diameter.

5. The element of claim 1, wherein two or more small openings ranging in size from about 30 μ

m to about 0.5 mm in diameter are provided per spot of blood sample, said small openings being circular or triangular and being arranged within a circle having a diameter of about 1 mm to 5 mm.