The invention relates to a negative pressure device for a treatment of a lower part of a patient’s body, comprising: - a pressure chamber, comprising a first opening configured to introduce the lower part of the patient’s body into the interior of the pressure chamber, - a closure element arranged around the periphery of the first opening, wherein the closure element is configured to provide an airtight sealing around a patient’s body, and - a bed comprising a first bed element having a first lying surface and a second bed element having a second lying surface with a gap between them to allow the closure element to be moved between the first bed element and the second bed element. The bed is at least partially movable between a treatment position, in which the first bed element is outside the pressure chamber and the second bed element is inside the pressure chamber, and an access position, in which the first bed element is further spaced from the pressure chamber and the second bed element is at least partially moved out of the interior of the pressure chamber through the first opening, The bed comprises a frame element, wherein the frame element is fixedly connected to both the first bed element and the second bed element and that the frame element extends through a second opening from outside into the interior of the pressure chamber.
