Abstract: Safety drop infusion/transfusion set capable of preventing recovered hypodermic needle from being pushed out, including: a sleeve slidably fitted on an infusion/transfusion catheter, a locating flange being formed on inner face of the wall of bottom end of the sleeve; and a needle holder formed with an axial tunnel. A top section of the needle holder is formed as a seat body for fitting with a hypodermic needle. A bottom section of the needle holder is formed as a connecting section for tightly fitting with the infusion/transfusion catheter. When downward pulling the infusion/transfusion catheter, the needle holder is drivingly retracted and latched with the locating flange of the sleeve. The hypodermic needle along with the needle holder is retracted and hidden in the sleeve. Therefore, the hypodermic needle recovered in the sleeve is prevented from being again pushed out of the sleeve.

Abstract: A safety structure to prevent a socket from being over-heated in a lamp string, which comprises a separate lamp string made of a pre-determined number of sockets connected in series. The power-supply wire of the lamp string is connected in series with an additional socket to be plugged with a protective bulb. Two copper wires mounted in the glass tube of the protective bulb are fixed in place by means of a positioning bead. The tail ends of the two copper wires are connected with a fuse having a pre-determined power dissipation. In case of the fuse in the protective bulb being over-loaded, the fuse will be burned out automatically so as to prevent the sockets from being over heated to cause a hazard.