INJECTION NEEDLE ASSEMBLY AND DRUG INJECTION DEVICE Russian patent published in 2015 - IPC A61M5/32 

FIELD: medicine.

SUBSTANCE: group of inventions refers to medical equipment, namely to injection needle assemblies and to drug injection devices. The injection needle assembly comprises a needle tube, a needle sleeve and an elastic member. The needle tube has a needle point for skin needling. The needle sleeve comprises the first member that retains the needle tube, and the second member, wherein a syringe outlet is inserted. The elastic member is integrated inside the second member to create a liquid-tight close contact with the inner surface of the second member. The elastic member has an insert opening, wherein the needle tube is inserted. The elastic member has a stop surface which leans against a distal end of the syringe outlet. The elastic member has an end surface which is opposed to the stop surface and a spaced surface on the side of the end surface, which forms the insert opening on the end surface and which is spaced from an outer peripheral surface of the needle tube. According to the second version of the injection needle assembly, the elastic member has a flange portion clamped between the first member and second member. According to the third version of the injection needle assembly, the elastic member is provided with a portion of a valve member on the side of the needle, which is pressed to the outer peripheral surface of the needle tube under pressure exerted by the liquid drug released from the syringe outlet. A drug injection device comprises a syringe having the outlet and injection needle assembly configured in accordance with any of the above versions.

EFFECT: invention reduces a post-injection amount of the drug when using the structure, wherein the fine adjustment of the main end of the needle tube in relation to the needle sleeve is not necessary.

47 cl, 9 dwg, 1 tbl