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US 4,576,595 AGranted
Method and a closure cap for sealing a capillary tube
AssigneeRadiometer A/S
InventorsFlemming Aas, Borge Jeppesen
Life of this patent
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AssigneeRadiometer A/S
InventorsFlemming Aas, Borge Jeppesen
Estimating the term…
A capillary tube containing a sample is anaerobicly sealed by means of closure caps each comprising an end wall and a skirt portion. Each open end of the capillary tube is sealed by inserting the open tube end into the cap skirt portion, and in order to avoid that a volume of air is forced into the capillary tube, the space defined between the open tube end and the cap end wall is vented to the atmosphere through one or more venting passages defined in the walls of the closure cap or between the inner surface of the cap skirt portion and the adjacent outer peripheral surface of the capillary tube. The open tube end is brought into sealing engagement with sealing means on the cap end wall, and frictional engagement established between the inner surface of the cap skirt portion and adjacent outer peripheral surface parts of the capillary tube secures that said sealing engagement is maintained.
A closure cap for anaerobicly sealing an open end of a capillary tube having an inner and outer surface and being filled with a blood sample, said cap comprising an end wall having an inner surface and an annular skirt portion extending axially therefrom, the inner surface of said end wall comprising means for sealingly engaging with said open tube end the annular skirt having an inner surface of the skirt exceeding the cross section of the outer surface of the capillary tube thereby defining an annular space between the inner surface of the skirt portion and the outer surface of the capillary tube in the mounted position of the cap, said closure cap further comprising a skirt compression member having a passage defined therein for receiving said cap when mounted on said capillary tube, the cross section of said passage being sized so as to compress said skirt portion radially inwardly into frictional contact with the outer peripheral surface of the capillary tube when said cap skirt portion is inserted into said passage, whereby said end wall may be maintained in sealing engagement with said open tube end.
In a blood sampling set of the type having an open ended capillary tube and a pair of closure caps for anaerobicly sealing both tube ends, wherein the improvement comprises:
In a blood sampling set of the type having an open ended capillary tube and a pair of closure caps for anaerobicly sealing both tube ends, wherein the improvement comprises:
Dependencies are inferred from the claim text.