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These tubes are manufactured with a specific volume of gas removed from the sealed tube. When a needle from a hub or transfer device is inserted into the stopper, the tube's vacuum automatically pulls in the required volume of blood. [citation needed] The basic Evacuated Tube System (ETS) consists of a needle, a tube holder, and the evacuated ...
A range of Vacutainer tubes containing blood. A vacutainer blood collection tube is a sterile glass or plastic test tube with a colored rubber stopper creating a vacuum seal inside of the tube, facilitating the drawing of a predetermined volume of liquid. Vacutainer tubes may contain additives designed to stabilize and preserve the specimen ...
Evacuated tube collector Direct flow evacuated tube Heat pipe evacuated tube An array of evacuated tube collectors on a roof. Evacuated tube collectors are the most common solar thermal technology in the world. [7] They make use of a glass tube to surround the absorber with high vacuum and effectively resist atmospheric pressure.
The Keidel vacuum tube was a type of blood collecting device, first manufactured by Hynson, Wescott and Dunning in around 1922. [1] This vacuum was one of the first evacuated systems, predating the more well known Vacutainer. [1] Its primary use was to test for syphilis and typhoid fever. [2]
Heat absorbed by the evacuated tube causes some of the volatile liquid in the copper tube to evaporate and pass to the header. At the header the gas then condenses, releasing heat there, and the liquid runs back down inside the tube. Since the evacuated tubes themselves do not contain water, they are not vulnerable to frosting.
Finally, the nearly evacuated gas collecting tube is allowed to suck in an outgassed liquid, usually previously heated water, which is offered under atmospheric pressure . The gas collecting tube is weighed for a third and last time containing the liquid yielding the value m c o n t a i n i n g l i q u i d {\displaystyle m_{containingliquid}} .
This connector attaches to another device: e.g. syringe, vacuum tube holder/hub, or extension tubing from an infusion pump or gravity-fed infusion/transfusion bag/bottle. Newer models include a slide and lock safety device slid over the needle after use, which helps prevent accidental needlestick injury and reuse of used needles, which can ...
These tubes should be used with care when measuring drug or hormone levels because the drug or hormone may diffuse from the serum into the gel, causing a reduction in measured level. The gel in SST II tubes (which appears slightly less opaque) is supposed [weasel words] to have less effect on drug levels in serum. [citation needed]