| 摘要 |
An elongate, portable, hand-operated assembly adapted to create either a negative or positive pressure within the interior thereof, with the device being capable of having a hypodermic needle removably mounted on either end thereof. The assembly may be actuated to create a negative pressure to draw a liquid that may contain entrained particles of solid material into the interior of the assembly. After the assembly has introduced liquid therein in a desired volume, it may subject the liquid to positive pressure to separate particles of solid material such as protein, bacteria and viruses from the liquid.
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