The invention provides a medical device having a valve mechanism which has an effective sealing, is simple and cost-saving to produce and at the same time provides an improved pressure control. Additionally, an improved biocompatibility can be provided. The medical device comprises a channel and at least one valve element. The channel comprises at least two openings, and the valve element comprises at least one sealing area. The valve element can be brought in a closed state, such that the sealing area of the valve element seals one of the openings of the channel and the valve element is at least in part flexible, such that the valve element can be brought into an open state by the pressure of a medium inside the channel and the medium can exit the channel between the valve element and the channel.
