MEDICAL DEVICE

The present disclosure pertains to medical device such as a dialysis device for performing a hemodialysis, and/or hemofiltration and/or hemodiafiltration. The medical device can include a first functional module and a second functional module, wherein an operating hours counter for counting the operating hours is provided in the first functional module, and wherein the first functional module is configured to store an operating hours value determined by the operating hours counter in a first storage of the first functional module. In some embodiments, a second storage is provided in the second functional module, wherein the second functional module is configured to store the operating hours value determined by the operating hours counter of the first functional module in the second storage.