COMPOSITE SAFETY NEEDLE Russian patent published in 2007 - IPC A61M5/32 

FIELD: medical equipment, in particular, needle for liquid injections.

SUBSTANCE: composite safety needle has cylindrical casing with lower surface, needle bearing cannula fixed on lower surface, sleeve telescopically movable relative to casing, spring, and retaining member. Spring positioned within casing urges sleeve to move in direction providing covering of needle distal end, and retaining member also positioned within casing is movable simultaneously with sleeve during injection and automatically locks sleeve in position wherein acute end of needle is closed to thereby irreversibly block movements of composite safety needle.

EFFECT: reduced number of parts used in needle, relatively low allowance requirements with regard to these parts, and limited force applied by spring.

9 cl, 16 dwg