Vial cap for a liquid chromatography sample vial
A vial cap for a sample vial includes a cylindrical cap body defining a first circular opening at a first end. The vial cap also includes a cap lid extending radially inward from a second end of the cylindrical cap body. The cap lid defines a second circular opening. The vial cap also includes a septum located within the cylindrical cap body and in contact with the cap lid. The septum spans the second circular opening defined by the cap lid portion. The vial cap also includes a number of flexible threads extending from an internal surface of the cylindrical cap body.
1. A vial cap comprising:
a cylindrical cap body defining a first circular opening at a first end;
a cap lid portion extending radially inward from a second end of the cylindrical cap body, the cap lid portion defining a second circular opening;
a septum located within the cylindrical cap body and in contact with the cap lid portion, the septum spanning the second circular opening defined by the cap lid portion; and
a plurality of flexible threads extending from an internal surface of the cylindrical cap body, wherein each of the plurality of flexible threads defines an air pocket.
2. The cap of claim 1 , wherein the plurality of flexible threads includes at least two parallel threads.
3. The cap of claim 2 , wherein the at least two parallel threads are parallel to a plane in which the septum lies.
4. The cap of claim 2 , wherein the at least two parallel threads include two pairs of parallel threads displaced around the internal surface of the cylindrical cap body.
5. The cap of claim 2 , wherein the at least two parallel threads include more than two pairs of parallel threads displaced around the internal surface of the cylindrical cap body.
6. The cap of claim 2 , wherein the at least two parallel threads are configured to engage with external threads extending from a mouth of a vial when the first circular opening of the cylindrical cap body is positioned over the mouth of the vial.
7. The cap of claim 6 , wherein a spacing between parallel threads depends on a size of the external threads extending from the mouth of the vial.
8. The cap of claim 6 , wherein each of the plurality of flexible threads has a tapered cross sectional geometry as they extend radially inward, and an angle formed between a tapered surface of the plurality of flexible threads and the internal surface of the cylindrical cap body depends on a geometry of the external threads extending from the mouth of the vial.
9. The cap of claim 1 , wherein each of the plurality of flexible threads has a tapered cross sectional geometry as they extend radially inward.
10. The cap of claim 1 , wherein each of the plurality of flexible threads has a rounded cross sectional geometry.
11. The cap of claim 1 , wherein the septum and the plurality of flexible threads are formed from a single material.
12. The cap of claim 1 , wherein the plurality of flexible threads are formed from a material different from the septum.
13. The vial cap of claim 1 , wherein the septum is bonded to the internal surface of the cylindrical cap body.
14. The vial cap of claim 1 , wherein the septum comprises one or more slits.