Sampling method and device
Disclosed herein is test device and method for detection of sample analytes in which after sampling has occurred a closure is provided. Such a test device and method can be usefully employed to detect a variety of analytes including microorganisms.
1. A method for detecting an analyte in a sample, the method comprising:
a) providing an elongated test unit, the test unit comprising: (i) a hollow section having a first open end and second open end; (ii) a probe within the hollow section, the probe comprising a first probe end and a second probe end; (iii) a test unit cover, the cover adapted to enclose said first open end of the hollow section and positioned relative to the probe so that the longitudinal movement of the cover causes the longitudinal movement of the probe; (iv) a test vial extending from the second open end of the hollow section, and containing a reagent sealed therein by a frangible seal; (v) an o-ring surrounding the test unit and within an o-ring holder, the o-ring and o-ring holder configured so that the longitudinal movement of the cover secures the cover into the o-ring holder and in position so that the cover abuts the o-ring, said abutting of the o-ring by the cover forming a liquid barrier which barrier prevent liquid from leaking out of the test unit,
the test unit constructed and arranged to obtain a test sample on or within the second probe end and to provide admixture of the sample with the reagent within the test vial;
b) removing the probe from the test unit;
c) collecting a sample onto the probe to provide a sample-probe;
d) inserting the sample-probe into the test unit;
e) moving the sample-probe longitudinally through the frangible test vial seal to contact the reagent,
wherein moving the sample-probe longitudinally both ruptures a frangible seal and secures the cover within the o-ring holder wherein the cover abuts the o-ring.
2. The method of claim 1 wherein the test unit further comprises a plug, the plug attached to said sample-probe and configured so that the longitudinal movement of the sample-probe positions the plug so that the plug form a liquid seal between the peripheral wall of the plug and the inner diameter wall of the hollow section of the test unit, wherein said liquid seal prevents a liquid within the test unit from leaking out of the test unit.
3. The method of claim 2 further comprising providing a disinfectant tablet attached to the plug and positioned to be contacted by the reagent and the sample after testing.
4. The method of claim 1 wherein the probe comprises a shaft with a swab at the second probe end.
5. The method of claim 1 wherein the reagent comprises media for growth of a microorganism.
6. The method of claim 5 wherein said microorganism comprises a pathogen.
7. The method of claim 5 wherein said microorganism comprises Listeria monocytogenes.
8. The method of claim 5 wherein said microorganism comprises a phage.
9. The method of claim 1 wherein the reagent comprises media for growth of a microorganism and further comprise a colorimetric indicator of the presence or absence of said microorganism.
10. The method of claim 1 further comprising providing a removable sleeve, the sleeve surrounding the test unit and adapted to prevent the premature longitudinal movement of the probe.
11. The method of claim 1 further comprising providing a niblet within the test vial, the niblet containing a reagent to be combined with the reagent within the test vial.
12. The method of claim 1 wherein the first probe end is attached to the test unit cover.
13. An elongate test unit for detecting an analyte in a sample comprising:
a) a hollow section, the hollow section comprising a first open end and a second open end;
b) a probe within the hollow section, the probe comprising a first probe end and a second probe end the second probe end adapted for obtaining a test sample;
c) a test vial extending from the second open end of the hollow section, the test vial adapted to store a reagent and sealed by a frangible seal,
wherein when the probe is moved longitudinally the second probe end ruptures the frangible seal;
d) a test unit cover, the cover adapted to enclose said first open end of the hollow section and positioned relative to the first probe end so that the longitudinal movement of the cover causes the longitudinal movement of the probe, the longitudinal movement resulting in both the rupture of the frangible seal and the abutting of the cover with an o-ring within an o-ring holder, the o-ring holder and o-ring positioned on the outside wall of the test unit body,
the test unit constructed and arranged to obtain a test sample on the probe and to provide admixture of the sample on the probe with the reagent within the test vial and wherein the abutting of the cover with the o-ring prevents liquid from leaking out from the test unit.
14. The test unit of claim 13 further comprising a plug, the plug attached to said sample-probe and configured so that the longitudinal movement of the sample-probe positions the plug so that the plug forms a liquid seal between a peripheral wall of the plug and a inner diameter wall of the hollow section of the test unit, and further comprising a bore extending therethrough, the plug bore having an entrance end and an exit end, the plug bore being shaped to receive the probe and configured to form a liquid seal between the peripheral wall of the probe and the internal wall of the plug, wherein when the probe is moved longitudinally the second probe end ruptures the frangible seal and the plug forms the liquid seal between the peripheral wall of the plug and the inner diameter wall of the hollow section of the test unit.
15. The test unit of claim 14 wherein the liquid seal between the peripheral wall of the probe and the internal wall of the plug comprise an o-ring.
16. The test unit of claim 14 wherein the liquid seal between the peripheral wall of the plug and the internal wall of the hollow section of the test unit comprises an o-ring.
17. The test unit of claim 13 wherein the reagents comprise media for growth of a microorganism.
18. The test unit of claim 17 wherein said microorganism comprises a pathogen.
19. The test unit of claim 17 wherein said microorganisms comprises Listeria monocytogenes.
20. The test unit of claim 13 wherein said reagents comprise media for growth of a microorganism and further comprise a colorimetric indicator of the presence or absence of said microorganism.
21. The test unit of claim 13 further comprising providing a removable sleeve, the sleeve adapted to prevent the premature longitudinal movement of the probe.
22. The test unit of claim 13 wherein the second probe end comprises an absorbent tip configured to absorb a sample from a surface.