ACCESS SYSTEM FOR A MEDICAL DEVICE FOR DRAWING A MEDICAL LIQUID, MONITORING SYSTEM COMPRISING SUCH AN ACCESS SYSTEM, AND MEDICAL TREATMENT DEVICE COMPRISING SUCH A MONITORING SYSTEM

The invention relates to an access system 1 for a medical device, which system has a housing body 21 in which an inner pipe portion 22 for transporting a medical fluid is formed, which portion is enclosed by an outer pipe portion 24 so as to form an empty space 23 for receiving a disinfectant fluid, the housing body 21 having an opening 25 that can be closed by a closure element. The access system 1 according to the invention is characterised in that a measuring electrode 30 and at least one counter electrode 31, 32 are arranged in the housing body 21 such that the measuring electrode 30 interacts with the counter electrode via the empty space 23. The measuring electrode 30 allows an electrical signal to be input such that a current flowing between the measuring electrode and the counter electrode or a voltage applied between the measuring electrode and the counter electrode can be evaluated. On the basis of the evaluation of the current or voltage, the presence or absence of a fluid or moisture in the empty space 23 can be inferred and/or a conclusion can be made as to whether a particular fluid is present in the empty space 23. The invention also relates to a monitoring system 2 having such an access system 1, to a medical treatment device 1 having such a monitoring system 2, and to a method for monitoring an access system for a medical device.