Multifunctional syringe with safety slide sleeve

A multifunctional syringe with safety slide sleeve, comprising:

• a connecting tube including a tube body formed with a central axial through hole, an infusion tube connecting section being formed at a bottom end of the tube body, a needle connecting section being formed at a top end of the tube body, a latching groove being formed on the tube body near the top end thereof, at least one downward tapered guiding rib being formed on the tube body and axially downward extending from a lower side of the latching groove;
• an infusion tube serially connected with the infusion tube connecting section of the bottom end of the connecting tube;
• an injection needle serially connected with the needle connecting section of the top end of the connecting tube;
• and
• a safety slide sleeve including a sleeve section formed with a central axial fitting hole in which the connecting tube is fitted, a bottom end of the fitting hole being formed with an inward extending latching flange, whereby when the slide sleeve is slided upward, the latching flange is guided by and slided over the guiding rib to be latched in the latching groove of the connecting tube so as to totally enclose the injection needle in the fitting hole.