The vacuum blood collection tube needs to be used in conjunction with the venous blood collection needle. The human venous blood is drawn into the blood sample container through the blood collection needle under the pre-formed negative pressure inside the vacuum blood collection tube. Corresponding to the specifications of the container and the degree of vacuum). After one end of the blood collection needle is pierced into a human vein, the other end is inserted into the rubber plug of the vacuum blood collection tube. The end sleeve has a self-sealing rubber sleeve, which can realize multi-tube collection without leakage under one venipuncture.
Common blood collection needles have two types: hard-connected and soft-connected. The volume of the internal cavity of the hard-connected lancet is small, and the effect on the blood volume can be ignored, but the probability of reversal is relatively higher. The hard-connected lancet needs to be used in conjunction with the needle holder. The probability of the soft-connected lancet has a reverse flow It is relatively small, but the volume of the inner cavity is larger, which will consume a part of the vacuum of the blood collection tube, thereby reducing its collection volume.
