Device and method for whole blood separation and analysis

• US 4,678,757 A
• Filed: 04/11/1985
• Issued: 07/07/1987
• Est. Priority Date: 04/11/1985
• Status: Expired due to Term

• Current Assignee: Smithkline Diagnostics, Inc. (GlaxoSmithKline PLC)
• Original Assignee: Smithkline Diagnostics, Inc. (GlaxoSmithKline PLC)
• Inventors: Rapkin, Myron C., Van Rysselberghe, Pierre C., Schoengold, Ronald J., Shockey, David R.
• Primary Examiner(s): Richman, Barry S.
• Assistant Examiner(s): KRYZA, LYNN M
• Application Number:
  US06/722,231
• Time in Patent Office: 817 Days
• Field of Search: 436/169, 436/170, 436/177, 436/178, 422/56-58, 422/101, 435/13, 435/805
• US Class Current: 436/169
• CPC Class Codes: G01N 33/523 the element being adapted for a specific analyte
• CPC Class Codes: Y10S 435/805 Test papers
• CPC Class Codes: Y10T 436/25375 Liberation or purification of sample or separation of material from a sample [e.g., filtering, centrifuging, etc.]
• CPC Class Codes: Y10T 436/255 including use of a solid sorbent, semipermeable membrane, or liquid extraction

Abstract

A method and device for separating blood into fluid and cellular fractions for diagnostic tests. The whole blood is introduced to a carrier containing a layer of carbohydrate which results in the rapid separation of the fluid from the cellular fractions. In a preferred embodiment, the device is fabricated in a sandwich design containing layers of carbohydrate and reagent material between two layers of plastic.

Claims

1. A test device for separating the fluid portion from whole blood and detecting soluble components in whole blood which comprises a first impermeable carrier having applied thereon a sugar and a second impermeable carrier having incorporated thereon a test reagent specifically reactable with a component to be detected, said first and second carriers being affixed to one another substantially along their entire juxtaposed peripheral edges defining an opening there-between and so layered that the sugar and reagent are in contiguous facing relationship, wherein said opening and carriers permit capillary and longitudinal transport of the blood.

2. The device of claim 1 wherein the first carrier is a polyester and the second carrier is a polycarbonate.

3. The device of claim 1 wherein the first carrier is opaque and the second carrier is transparent.

4. The device of claim 1 wherein the sugar is mannitol.

5. A method for separating whole blood into fluid and cellular fractions which comprises applying the blood to the device of claim 1 whereby the cellular fraction remains in close proximity to the site of contact and the fluid fraction migrates in a longitudinal fashion away from said site.

6. The method of claim 5 wherein the sugar is mannitol.