Test strip holder and method of use

• US 5,656,502 A
• Filed: 06/07/1995
• Issued: 08/12/1997
• Est. Priority Date: 06/07/1995
• Status: Expired due to Fees

• Current Assignee: Genzyme Corporation (Sanofi )
• Original Assignee: Diagnostic Chemicals Limited
• Inventors: Fredrickson, Robert A., MacKay, Dana H.
• Primary Examiner(s): ALEXANDER, LYLE
• Application Number:
  US08/476,036
• Time in Patent Office: 797 Days
• Field of Search: 422/56-58, 422/61, 436/169, 436/180
• US Class Current: 436/180
• CPC Class Codes: B01L 2300/0825 Test strips
• CPC Class Codes: B01L 2400/0406 capillary forces
• 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

A test strip holder includes an elongated hollow member having an open end and a closed end. A support is provided that positions a test strip within the elongated hollow member spaced from inner walls of the elongated hollow member. At least one vent is positioned between the open end and the closed end of the elongated hollow member. The distance from the open end to the at least one vent opening defines the maximum height of liquid able to enter the elongated hollow member from the open end other than by capillary action. The elongated member may be formed as a tubular conduit. Alternatively, the elongated member may include a test strip receiving part and a test strip covering part, wherein the test strip receiving part may or may not be hingedly connected to the test strip covering part.

Claims

1. A test strip holding apparatus, comprising:

an elongated hollow member having an open end and a closed end;

a support configured to hold a test strip within the elongated hollow member in a position spaced from inner walls of the elongated hollow member; and

at least one vent positioned between the open end and the closed end, said at least one vent being spaced from the open end and the closed end,

wherein said at least one vent vents the elongated hollow member at a distance from the closed end and by air pressure in the closed end limits a maximum height that a liquid can travel through said elongated hollow member from said open end toward said closed end other than by capillary force along a test strip when said open end is dipped into said liquid.

2. The apparatus according to claim 1, wherein the at least one vent comprises a plurality of vents.

3. An apparatus according to claim 1, wherein the elongated hollow member has a circular cross-section.

4. An apparatus according to claim 1, wherein the closed end is formed by walls of the elongated hollow member.

5. An apparatus according to claim 1, wherein the closed end is closed by a sealing plug.

6. An apparatus according to claim 1, wherein the open end includes a plug having a through passage inserted into the open end of the elongated hollow member.

7. An apparatus according to claim 6, wherein the plug defines at least a portion of the support.

8. An apparatus according to claim 6, wherein the through passage has a diameter substantially equivalent to the width of the test strip to frictionally support the test strip within the through passage of the plug, spaced from inner walls of the elongated hollow member.

9. An apparatus according to claim 1, further including a test strip held by the support.

10. An apparatus according to claim 1, wherein the elongated hollow member includes a test strip receiving part and a test strip covering part, wherein the test strip receiving part is connectable to the test strip covering part.

11. An apparatus according to claim 10, wherein the elongated hollow member includes a test strip receiving part, including a flat surface and a test strip covering part including another flat surface complimentary with the flat surface, wherein the flat surface and the another flat surface are sealed together.

12. An apparatus according to claim 10, wherein one of the test strip covering part and the test strip receiving part includes a groove and the other of the test strip covering part and the test strip receiving part includes a projection, the projection being configured to sealingly fit into the groove, wherein the groove and projection fit together to define the elongated hollow member.

13. An apparatus according to claim 10, wherein the test strip receiving part includes a test strip channel configured to receive the test strip, the support being located within the test strip channel.

14. An apparatus according to claim 13, further including a stop proximate the open end capable of maintaining the test strip within the test strip channel.

15. An apparatus according to claim 13, wherein the channel comprises a center planar support surface surrounded by raised side portions that constrain movement of a test strip.

16. An apparatus according to claim 10, wherein the at least one vent is formed in the test strip covering part.

17. A method of testing a liquid using a test strip within a test strip holder, the method comprising the steps of:

supporting a test strip within an elongated hollow member having an open end, a closed end and a sidewall with at least one vent in the sidewall between and spaced from the open end and the closed end, the test strip being spaced from inner walls of the elongated hollow member;

immersing the elongated hollow member into a liquid to be tested to at least a depth of the at least one vent, wherein said at least one vent vents the elongated hollow member at a distance from the closed end and by air pressure in the closed end limits a maximum height that said liquid travels through said elongated hollow member from said open end toward said closed end other than by capillary force along said test strip when said open end is dipped into said liquid; and

observing an effect of the liquid on the test strip above the at least one vent.

18. The method according to claim 17, wherein the step of supporting the test strip includes frictionally supporting the test strip at a portion of the hollow member where liquid enters.

19. The method according to claim 17, wherein the step of supporting the test strip includes supporting the test strip at a plurality of locations.

20. The method according to claim 17, wherein liquid travels up the test strip only by capillary action within the test strip.

21. A test strip holding apparatus, comprising:

means for supporting a test strip within and spaced from inner walls of means for receiving a test strip having an open end and a closed end;

means for venting the means for receiving between the open end and the closed end and at a distance from the closed end which by air pressure in the closed end limits a maximum height that a liquid can travel through said receiving means from said open end toward said closed end other than by capillary force along a test strip as the open end of the means for receiving is dipped into the liquid, said venting means being spaced from the open end and the closed end; and

means for observing the effect of the liquid on the test strip.

22. The apparatus according to claim 21, wherein the means for observing comprises a window in the means for receiving.

23. An apparatus according to claim 21, further including a test strip held by the supporting means.

24. A method for testing a liquid, comprising:

supporting a test strip within and spaced from inner walls of means for receiving a test strip having an open end and a closed end;

venting the means for receiving through means for venting between the open end and the closed end and at a distance from the closed end to limit, by air pressure in the closed end, a maximum height that a liquid can travel through said receiving means from said open end toward said closed end other than by capillary force along a test strip as the open end of the means for receiving is dipped into the liquid, the means for venting being spaced from the open end and the closed end; and

observing the effect of the liquid on the test strip.