A medical appliance for extracorporeal blood treatment, having - a housing component, a cover and a pivot bearing arrangement (25, 25a) by means of which the cover is mounted on the housing component and so as to be pivotable about a pivot axis relative to the housing component, - wherein the cover is pivotable at least between a covering position, in which the cover covers the housing component, and a release position, in which the cover releases the housing component, - and wherein the pivot bearing arrangement (25, 25a) has at least two pivot bearings (25, 25a) arranged spaced apart from one another along the pivot axis, - characterized in that the pivot bearings (25, 25a) each have a bearing element (26, 26a) and a bearing element receptacle (27, 27a), - wherein the bearing elements (26, 26a) engage in the respective bearing element receptacle (27, 27a) and are pivotable about the pivot axis and linearly movable to a limited extent along the pivot axis, relative to said bearing element receptacle, - as a result of which the cover can be shifted in a linearly movable manner along the pivot axis relative to the housing component between a removal position, in which at least one of the bearing elements (26, 26a) is not in engagement with the respective bearing element receptacle (27, 27a), and a bearing position, in which the two bearing elements (26, 26a) are in engagement with the respective bearing element receptacle (27, 27a), - and wherein a spring arrangement is provided by means of which the cover is mounted resiliently along the pivot axis and is elastically pretensioned relative to the housing component in the direction of the bearing position. - a housing component, a cover and a pivot bearing arrangement (25, 25a) by means of which the cover is mounted on the housing component and so as to be pivotable about a pivot axis relative to the housing component, - wherein the cover is pivotable at least between a covering position, in which the cover covers the housing component, and a release position, in which the cover releases the housing component, - and wherein the pivot bearing arrangement (25, 25a) has at least two pivot bearings (25, 25a) arranged spaced apart from one another along the pivot axis, - characterized in that the pivot bearings (25, 25a) each have a bearing element (26, 26a) and a bearing element receptacle (27, 27a), - wherein the bearing elements (26, 26a) engage in the respective bearing element receptacle (27, 27a) and are pivotable about the pivot axis and linearly movable to a limited extent along the pivot axis, relative to said bearing element receptacle, - as a result of which the cover can be shifted in a linearly movable manner along the pivot axis relative to the housing component between a removal position, in which at least one of the bearing elements (26, 26a) is not in engagement with the respective bearing element receptacle (27, 27a), and a bearing position, in which the two bearing elements (26, 26a) are in engagement with the respective bearing element receptacle (27, 27a), - and wherein a spring arrangement is provided by means of which the cover is mounted resiliently along the pivot axis and is elastically pretensioned relative to the housing component in the direction of the bearing position.