A blood collection needle for collecting a blood sample in a medical examination process, comprising a needle and a needle bar, the needle is arranged on the head of the needle bar, and a sheath is slidably connected on the needle bar, and a sheath is arranged between the sheath and the needle bar There is a return spring and the initial position of the sheath is at the head of the needle and the needle bar. When the operator holds the needle to press the head of the blood collection needle on the limb of the patient, the sheath is retracted under the elastic force of the skin, causing the needle to protrude and penetrate the skin to cause minimally invasive, and the sheath is in the return spring after the blood collection needle is removed. Re-reset under action to cover the needle to avoid contamination of the needle or accidental puncture of the human body. When the blood collection needle is removed, the cavity enclosed by the needle tube and the skin gradually increases, forming an instantaneous negative pressure, which is favorable for the collection of blood samples.
Post time: Jul-24-2018