| 摘要 |
A drug injection syringe includes an injection needle assembly and a syringe body. The injection needle assembly includes an injection needle, a needle hub, an elastic body, and a fitting sleeve. The fitting sleeve accommodates the needle hub and the elastic body and has a fitting hole formed in a female taper shape. The syringe body includes an outer tube and a drug discharge tube formed in a male taper shape. The syringe body is attached to the injection needle assembly by pushing the drug discharge tube into the fitting hole by a press fitting. The elastic body couples the drug discharge tube and the injection needle in a liquid-tight manner by compressively deforming, due to the press fitting, at a protruding portion disposed on a periphery of the pocket and stretching against an inner wall of the fitting hole. |
| 主权项 |
1. A drug injection syringe comprising:
an injection needle assembly comprising:
an injection needle,a needle hub supporting the injection needle,an elastic body disposed on the needle hub, wherein the injection needle is disposed in the elastic body, anda fitting sleeve accommodating the needle hub and the elastic body, and including a fitting hole formed in a female taper shape having a diameter that decreases toward a needle tip; and a syringe body comprising:
an outer tube configured to contain a drug sealed by a gasket disposed in the outer tube, anda drug discharge tube provided on a front end side of the outer tube, wherein the drug discharge tube has a male taper shape configured to fit in the female taper shape of the fitting sleeve,wherein the syringe body is configured to be attached to the injection needle assembly by pushing the drug discharge tube into the fitting hole by press fitting, wherein the elastic body comprises a pocket that opens to a contact surface configured to make contact with a distal end of the drug discharge tube, and wherein the elastic body is configured to couple the drug discharge tube and the injection needle in a liquid-tight manner by compressively deforming, due to the press fitting, at a protruding portion disposed on a periphery of the pocket and stretching against an inner wall of the fitting hole. |
