Holding arm (1) for medical purposes, in particular for holding a surgical mechatronic assistance system and / or a surgical instrument, having a proximal end (2) for attaching the support arm (1) to a base and a distal end (4) for receiving a surgical mechatronic assistance system and / or surgical instrument； at least a first and a second arm segment (12, 14), wherein the first arm segment (12) is connected to a first joint (13) and the second arm segment (14) is connected to a second joint (15), each joint (13, 15) is releasable and lockable by means of a release device； an operating unit (28) for bringing the holding arm (1) into a desired pose； a control unit (74), which is coupled to the operating unit (28) and the enabling device for transmitting signals from the operating unit (28) to the enabling device, an interface (500) for receiving a key (510), and a detection means (522 , 524) for detecting an identity of the key (510), wherein the control unit (74) is adapted to control the enabling means in dependence on the identity of the received key (510) such that upon detection of a first identity of a first key (510) 510) a first plurality of restrictions is provided for the holding arm (1), and in that upon detection of a second identity of a second key a second plurality of restrictions is provided for the holding arm (1).Buluş tıbbi amaçlar, bilhassa mekatronik bir cerrahi yardımcı sistemi ve/veya cerrahi aleti tutmak için bir tutma koluna ilişkin olup şunları içerir: tutma kolunu bir tabana sabitlemek için yakın bir uç ve mekatronik cerrahi yardımcı sistemi ve/veya cerrahi aleti almak için uzak bir uç； en az birinci bir ve ikinci bir kol segmenti, birinci kol segmenti birinci bir mafsala ve ikinci kol segmenti ikinci bir mafsala bağlıdır； bir serbest bırakma düzeneği, mafsalların her biri serbest bırakma düzeneği vasıtasıyla serbest bırakılabilir ve kilitlenebilir； tutma kolunu istenen bir poza getirmek için bir kumanda birimi； kumanda biriminden serbest
