A safety syringe includes a barrel including a hollow cylindrical tip a needle assembly including a hollow needle hub on the tip a hinge including a bifurcated base and a moveable bifurcation on the needle hub, the movable bifurcation having two relaxation length of hinge ends pivotably secured to the base, a wall member formed with the bifurcation, and a V-shaped resilient member having two ends hingedly secured to the bifurcation and the base respectively and a needle protection housing including a grooved body and a latch releasably secured to the wall member. When the needle protection housing is pivoted about both the resilient member and the hinge ends, resilient energy is stored in the resilient member. When the resilient energy reaches a set value, the resilient member releases the resilient energy to pivot the needle protection housing toward a hypodermic needle until the hypodermic needle is lockingly concealed in the grooved body.
