Semi-automatic sample feeding needle

The invention discloses a semi-automatic sample feeding needle, which comprises a needle tube, a needle head and a cylinder-shaped body, wherein one end of the needle tube is connected with the needlehead, the other end of the needle tube is connected with the cylinder-shaped body, the outside of the cylinder-shaped body is connected with an upper quick pressing rod through a balance bracket, thequick pressing rod is arranged above the needle tube and the cylinder-shaped body and is parallel to the needle tube and the cylinder-shaped body, the front end of the quick pressing rod is providedwith a braking spring which acts downwards on the outer wall of the cylinder-shaped body, the rear end of the quick pressing rod is provided with a speed regulating guide rod, the lower end of the speed regulating guide rod acts on the inner side of the cylinder-shaped body, and the cylinder-shaped body is internally provided with a liquid quantity pull rod used for drawing liquid medicine. The needle is a semi-automatic sample feeding needle and can trigger a device to quickly feed samples after the needle is inserted, hands do not directly contact the tube wall, and the reagent can be prevented from expanding with heat and contracting with cold. The semi-automatic sample feeding needle can be used, by one researcher, to independently complete the fixed-point, positioning, fixed-speed andquantitative medicine feeding operation for an animal experiment body.