A medical device for use in the interior of a body lumen includes a balloon catheter and a radially expandable stent. The cylinderpiston unit is provided with a cylinder and with a piston which is guided therein and which is sealed off in a sterile manner by a rubber seal, the cylinder and the piston enclosing a chamber that can be filled at least temporarily with active substance, and the cylinder having at least one discharge element at its front end. A feed gas which comprises a DME-containing feedstock gas and an additive gas and further contains steam at a specific proportion is introduced into an olefin synthesis reactor to contact the feed gas with a zeolite catalyst, thereby producing a hydrocarbon product containing C2-C5 olefins. Thus, with the touch screen sensor, a user may navigate through the game service interface and supply gaming information required to obtain a game service.