A patient device includes a case and a user interface for interaction between a patient and the patient device. The case may include a projection unit which projects information onto a surface separate from the case. The user interface may include a display unit for displaying information relating to the patient device integrated into the case and an additional display unit for displaying information relating to the patient device, which is external to the case. The externally provided display unit may be coupled to the case such that it can be at least one of folded, tilted, pulled out or unrolled relative to the case.