Abstract: A medical syringe has a tubular body extending along an axis and having a front end and a rear end, a plunger axially slidable in the body and carrying a stem projecting axially rearward out of the body from the plunger, and a free piston slidable in the body forward of the plunger and subdividing the body forward of the plunger into a front compartment at the front body end and a rear compartment between the plunger and the piston. The body is formed with a bypass passage forward of the piston in a starting position so the front compartment can hold a soluble medicament and the rear compartment can hold its solvent. Structure at the rear body end forms a radially inwardly open angularly limited cutout and at least two axially spaced, angularly offset, and radially outwardly projecting stop bumps on the stem are axially displaceable through the cutout in respective angularly offset positions of the stem.

Abstract: The invention relates to a method for creating a vein access, particularly on the human body, wherein at first the area of the skin surface (1) surrounding the vein access is disinfected, than the epiderm (3) is penetrated and the vein (4) opened and wherein finally a cannula part (5) is inserted in the vein (4). Further the invention relates to a device for implementing the method. Thereby the penetration of the epiderm (3) and/or the opening of the vein (4) are performed by a cutting device (6) operating with electromagnetic radiation.