An assembly includes at least two medical treatment units, each of which can be allocated to a patient and at least two peripheral devices, each of which can be allocated to a patient. The peripheral devices and the treatment units have means for allocating a peripheral device to a treatment unit and means for verifying the allocation of a peripheral device to a patient. To allocate a peripheral device to a treatment unit, the peripheral device is placed by operators in a receiving unit belonging to the treatment unit. Said receiving unit is preferably designed as a charging station for the battery of the peripheral device. In the event of a successful allocation of peripheral device and patient, confirmed by the receipt of physiological data of the patient, the operators verify the correct allocation of a peripheral device to the patient and must confirm the correct allocation by confirmation means. The peripheral device is only released if the operator has confirmed the correct allocation, preferably within a predefined time period.