a combined needle and catheter assembly comprising a body in which is provided a plunger having the needle at one end with the catheter enclosing said needle with the tip exposed . a pusher is provided to move the plunger to the proximate end of the body to expose the needle with catheter and to lock the plunger in place against a spring which biases the plunger toward the distal position in the body . after use of the needle with the catheter moved into place , a release is employed to permit the plunger with needle to be driven back into the body , permitting the catheter to be separated from the body and ready for use .