Sample collection
Sample collection apparatus and methods of sample collection are provided, for example saliva collection apparatus and methods of saliva collection. Said apparatus conveniently comprises a filter assembly and an interface for delivering material from the apparatus to an assay unit.
1. A sample collection apparatus comprising a filter assembly to filter samples of saliva collected therein, the filter assembly comprising:
a first filter element arranged to separate relatively large particulate matter from a sample, by action of gravity drawing the relatively smaller particulate matter and liquid components through the first filter element,
the first filter element comprises an upwardly angled conical or frustoconical first filter surface, arranged with a wall, to pool the sample in a corner region between the first filter surface and the wall;
wherein the filter assembly comprises a second filter element; and
wherein the first and second filter elements are arranged in the filter assembly such that the output side of the first filter element is in fluid communication with the input side of the second filter element, and wherein the second filter element is arranged to separate relatively small particulate matter from a sample, by action of gravity drawing the liquid component through the second filter element such that only particulate matter below a predetermined threshold remains with the filtered liquid component.
2. The filter assembly according to claim 1 , wherein the filter assembly is arranged with a buffer volume between the output side of the first filter element and the input side of the second filter element.
3. The filter assembly according to claim 1 , wherein the first filter surface is provided as part of an upwardly extending first filter element.
4. The filter assembly according to claim 1 , wherein the first filter element comprises a plurality of discrete filter holes.
5. The filter assembly according to claim 1 , wherein the first filter surface comprises a first group of holes arranged relatively closer to the corner, and a second group of holes arranged relatively further from the corner.
6. The filter assembly according to claim 1 , wherein the first filter element is provided as an insert arranged in a container in which the sample is provided.
7. The filter assembly according to claim 1 , wherein the first filter element and the container are arranged, such that inserting the first filter element into the container to an inserted position causes retention of the first filter element in the container.
8. The filter assembly according to claim 1 , wherein the wall is provided, at least in part, by an opposed portion of the first filter element, providing an upwardly angled surface that extends from the corner region away from the first filter surface.
9. The filter assembly according to claim 1 , wherein the wall is provided, at least in part, by the container in which the sample has been collected.
10. The filter assembly according to claim 1 , wherein the second filter element is made of a fibrous material.
11. The filter assembly according to claim 1 , wherein the second filter element is provided as an insert arranged in a container in which the sample is provided.
12. The filter assembly according to claim 1 , wherein the first filter element, second filter element and container are arranged, such that inserting the first filter element into the container to an inserted position causes retention of the second filter element in the container.
13. A method of filtering saliva in a sample collection apparatus, the method performed using a filter assembly of the sample collection apparatus comprising
a first filter element arranged to separate relatively large particulate matter from a sample, by action of gravity drawing the relatively smaller particulate matter and liquid components through the first filter element, and
a second filter element arranged such that the output side of the first filter element is in fluid communication with the input side of the second filter element and the second filter element is arranged to separate relatively small particulate matter from the sample, by action of gravity drawing the liquid component through the second filter element such that such that only particulate matter below a predetermined threshold remains with the filtered liquid component,
the method comprising collecting a sample of saliva, and characterised by pooling the collected sample in a corner region between an upwardly angled conical or frustoconical first filter surface of the first filter element and a wall.
14. The method of filtering according to claim 13 , the method performed using the filter assembly provided in a container, the method comprising arranging the container to rest on a level surface with the first filter surface as an upwardly angled first filter surface, and/or the wall extending generally upwards vertically.