Device and method for completing a fluidic circuit which employs a liquid expandable piece of bibulous material

• US 5,135,873 A
• Filed: 11/27/1989
• Issued: 08/04/1992
• Est. Priority Date: 11/27/1989
• Status: Expired due to Term

• Current Assignee: Dade Behring Marburg GmbH (Siemens AG)
• Original Assignee: Syntec Incorporated (Atos SE)
• Inventors: Patel, Rajesh D., Kurn, Nurith, Ullman, Edwin F., Becker, Martin
• Primary Examiner(s): Lacey, David L.
• Assistant Examiner(s): Snay, Jeffrey R.
• Application Number:
  US07/441,665
• Time in Patent Office: 981 Days
• Field of Search: 422/56, 422/57, 422/58, 422/61, 422/100, 436/161, 436/165, 436/169, 436/170, 436/180, 436/807, 436/810, 436/514, 435/4, 435/805, 435/808, 435/810
• US Class Current: 436/180
• CPC Class Codes: B01L 2300/0672 Integrated piercing tool
• CPC Class Codes: B01L 2300/0825 Test strips
• CPC Class Codes: B01L 2400/0406 capillary forces
• CPC Class Codes: B01L 2400/0633 with moving parts
• CPC Class Codes: B01L 2400/0661 shape memory polymer valves
• CPC Class Codes: B01L 2400/0683 mechanically breaking a wall or membrane within a channel or chamber
• CPC Class Codes: B01L 3/5023 with a sample being transported to, and subsequently stored in an absorbent for analysis
• CPC Class Codes: Y10T 436/2575 Volumetric liquid transfer

Abstract

Disclosed are methods and devices for permitting capillary flow of liquid between two or more pieces of bibulous material which, prior to actuation, are in a non-capillary flow relationship. In particular, the device is actuated and a capillary flow relationship is initiated between the two or more pieces of bibulous material in non-capillary flow relationship by utilizing a liquid expandable piece of bibulous material.

Claims

1. A device for permitting capillary flow of a liquid between two or more pieces of bibulous material which prior to actuation are in a non-capillary flow relationship to each other which comprises:

(a) a housing have a compressible member confined therein;

(b) a liquid expandable piece of bibulous material within said housing; and

(c) two or more pieces of bibulous material, affixed to said compressible member, in a non-capillary flow relationship with each other and with said liquid expandable piece of bibulous material, said liquid expandable piece of bibulous material being positioned in said housing such that upon expansion said compressible member is compressed and said two or more pieces of bibulous material are brought into capillary flow relationship with each other.

2. The device according to claim 1 wherein said liquid expandable piece of bibulous material is affixed to said compressible member.

3. The device according to claim 1 wherein said liquid expandable piece of bibulous material is affixed to said housing.

4. The device according to claim 1 wherein said liquid expandable piece of bibulous material expands when wetted and thereby results in two of said pieces of bibulous material directly physically contacting one another in such a manner so as to achieve said capillary flow relationship between said two or more pieces.

5. The device according to claim 1 comprising two pieces of said bibulous material in a non-capillary flow relationship to each other wherein upon expansion of said liquid expandable piece of bibulous material, said two pieces of bibulous material directly physically contact each other thereby creating said capillary flow relationship.

6. The device according to claim 1 comprising three pieces of said bibulous material in a non-capillary flow relationship to each other wherein upon expansion of said liquid expandable piece of bibulous material, one of said three pieces of bibulous material directly physically contacts said remaining two other pieces thereby creating a capillary flow relationship among all three pieces.

7. The device according to claim 1 wherein said two or more pieces of bibulous material are paper strips.

8. A method for creating a capillary flow relationship between two or more pieces of bibulous material which prior to actuation are in a non-capillary flow relationship to each other which comprises:

(a) providing a device which comprises (i) a housing have a compressible member confined therein; and

(ii) two or more pieces of bibulous material affixed to said compressible member in a non-capillary flow relationship to each other; and

(iii) a liquid expandable piece of bibulous material within said housing which is in a non-capillary flow relationship with said two or more pieces of bibulous material and which is positioned in said housing such that upon expansion said compressible member is compressed and said two or more pieces of bibulous material are brought into a capillary flow relationship;

(b) contacting said liquid expandable piece of bibulous material with a sufficient quantity of a liquid to wet said liquid expandable piece of bibulous material and cause it to expand.

9. The method according to claim 8 wherein said liquid expandable piece of bibulous material is affixed to said compressible member.

10. The method according to claim 8 wherein said liquid expandable piece of bibulous material is affixed to said housing.

11. The method according to claim 8 wherein two of said pieces of bibulous material directly physically contact one another in such a manner so as to achieve said capillary flow relationship between said two or more pieces when said liquid expandable piece is contacted with said liquid.

12. The method according to claim 8 wherein said device comprises two pieces of said bibulous material in a non-capillary flow relationship to each other wherein upon expansion of said liquid expandable piece of bibulous material, said two pieces of bibulous material directly physically contact each other thereby creating said capillary flow relationship between said pieces.

13. The method according to claim 8 wherein said device comprises three pieces of said bibulous material in a non-capillary flow relationship to each other wherein upon expansion of said liquid expandable piece of bibulous material, one of said three pieces of bibulous material directly physically contacts said remaining two other pieces thereby creating a capillary flow relationship among all three pieces.

14. The method according to claim 8 wherein said two or more pieces of bibulous material are paper.

15. The method according to any one of claims 11, 12 and 13 wherein upon expansion of said liquid expandable piece of bibulous material, said compressible member compresses thereby permitting said contact.