The document describes a device called the RDVT-01 Drawing Volume Tester, which tests vacutainer blood collection tubes. It works by using a double-ended needle attached to a plastic holder to puncture the rubber stopper of a vacutainer tube, allowing the vacuum inside the tube to draw a predetermined volume of blood or other liquid. The device is PLC-controlled, uses a touch screen interface, and includes an embedded vacuum pump to maintain a constant pressure and ensure testing accuracy.

1. RDVT-01 Drawing Volume Tester
Background
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 prior to
analytical testing.
Tubes are available with a safety-engineered stopper,
with a variety of labeling options and draw volumes. The
color of the top indicates the additives in the vial.
Description
Vacutainer needle are double ended, with one side being encased in a thin rubber coating for
safety. When the needle is screwed into the translucent plastic needle holder, the rubber
needle is inside the holder, and the exposed needle will be inserted into the vein.
When a vacutainer tube is inserted into the holder, its rubber cap is punctured by the inner
needle and the vacuum in the tube pulls blood through the needle and into the tube. The filled
tube is then removed and another can be inserted and filled the same way.
The amount of air evacuated from the tube predetermines how much blood will fill the tube
before blood stops flowing.
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Technical Features
It's a PLC controlled unit (industrial level stable) and HMI touch screen operated.
It is convenient in use, digital input, and the system will automatically keep constant pressure
in accordance with the change of liquid level in the tank, so as to guarantee the accuracy of
the test.
Vacuum pump embedded to save space and extra cost for user.
Data
Vacuum degree: 0~-40 KPa
(Similar to altitude 3600m)
Control: PLC and human machine interface
Power: 220V, 50/60Hz