FIELD: medicine.SUBSTANCE: group of inventions refers to medical equipment and describes an injection device, a method for mixing a first ingredient and a second ingredient with using the injection device, and using the injection device. The injection device comprises an elongated mixing container extending along a first axis, a piston member and a mixer. The piston member is movable in the mixing container. The mixer comprises a mixing element, an elongated element parallel with a first axis, and a handle. The piston member comprises a head having a canal moving the elongated and comprising the mixer. The piston member also comprises a first lock flexibly connected to the head, extending in a first position, substantially parallel with the elongated element and interacting with the mixer so that the piston member travels in the first direction along the first axis with the mixer, and moving the mixer in the second position in relation to the mixing container without regard for the piston member. The method for mixing contains the following stages: providing the first and second ingredients in the mixing container； folding the lock into the second position wherein the mixer is movable in relation to the mixing container without regard for the piston member； mixing the first and second ingredients by moving the mixer along the first axis； moving the first lock into the first position, wherein the first lock extends substantially in parallel with the elongated element and interacts with the mixer so that the piston member moves in the first direction along the first axis with the mixer； and moving the mixer in the first direction.EFFECT: invention enables providing mixing the two ingredients in the sterile environment.14 cl, 12 dwgГруппа изобретений относится к медицинской технике и характеризует устройство для инъекций, способ смешивания первого компонента и второго компонента с использованием устройства для инъекций и применение устройства для инъекций. Устройство
