NEEDLE FOR BLOOD COLLECTING TUBE

PROBLEM TO BE SOLVED: To provide a safe and efficient needle for a blood collecting tube preventing the counterflow of the blood in collecting it. SOLUTION: This needle for the blood collecting tube is so formed that, as shown in Figure, a needle 11 for the vein is installed in a hub 13 and a check valve 1 is installed in its inside. On the other hand, after a blood collecting needle 12 is attached to a hub 14 having a screw part in its circumference, the hub 14 is fitted in the hub 13 with the needle 11 for the vein. The fitting part E of the hub 13 is provided with an outer circumferential wall 14a and a space 18 in its inside. The outer circumferential wall 14a pushingly fixes the check valve 1 incorporated in the hub 13. The end face of a needle fixing member 15 installed in the opposite side in the needle for the vein, namely a face in contact with the check valve 1, has a shape corresponding to an opening part face of the check valve 1, and the face pushingly fixes the surface of needle side for the vein of the check valve. This pushing fixing eliminates the occurrence of strain to a counterflow pressure. COPYRIGHT: (C)2005,JPO&NCIPI