Disposable sterile retracting blood taking needle

A disposable sterile retracting safe blood taking needle, which consists of an end cover, a protective sleeve, a needle guard, a needle, a needle hub, a core rod, an outer sleeve, a sheath and a blood taking needle, wherein a column on a proximal end of the core rod is arranged in a hole of the needle hub, the outer sleeve is set outside the core rod, a lug of the core rod is arranged in a second slot of the outer sleeve;

• wherein a third mesa of the outer sleeve is fitted on a boss column on the proximal end of the core rod to form an interference fit, a through-hole of the core rod consists of a path and a glue hole, the blood taking needle is arranged in the glue hole, glue is applied in the glue hole to tighten the connection between the blood taking needle and the core rod;
• the lug of the core rod is arranged on the boss column on the proximal end of the core rod, a column of the core rod, a first mesa of the core rod, a first slot of the core rod, a second mesa of the core rod, the first mesa and the second mesa are arranged on the two sides of the first slot, a tapered transition is applied at the joint of the first mesa and the column, as well as at the joint of the second mesa and the column;
• wherein the outer sleeve is a hollow cylinder, the second slot is arranged on the inner surface of the hollow cylinder, and the third mesa is a lug on the inner surface of the hollow cylinder, the third mesa is used for running into the first slot to prevent the relative movement between the core rod and the outer sleeve;
• during blood taking or before blood taking, the relative movement between the outer sleeve and the core rod is prevented by the friction force between the lug of the core rod and the second slot of the outer sleeve and the friction force between the boss column of the core rod and the third mesa of the outer sleeve;
• and further wherein the boss column on the proximal end of the core rod has a proximal end that coincides with a proximal end of the lug.