Introduction of blood collection needle

A blood collection needle used for collecting blood samples in the process of medical examination is composed of a needle and a needle rod, the needle is arranged at the head of the needle rod, the needle rod is sliding connected with a sheath, and a reset spring is arranged between the sheath and the needle rod, and the initial position of the sheath is located at the head of the needle and the needle rod. When the operator holds the needle in hand and presses the blood collection needle on the patient's limb, the sheath retracted under the elastic action of the skin to make the needle protrude and Pierce into the skin, resulting in minimally invasive injury. After the blood collection needle is removed, the sheath is reset under the action of the reset spring and the needle head is covered to avoid the contamination of the needle exposed or accidental stabbing of the human body. When the blood collection needle is removed, the cavity between the needle and the skin gradually increases, forming instantaneous negative pressure, which is conducive to the collection of blood samples.

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