Medical device having a housing , having electrical and/or electronic components arranged inside the housing , and having a user interface , wherein the medical device also has a first receiving apparatus of a first communication interface (106-108), which receiving apparatus is accessible from outside the housing and is intended to receive a proximal end of a medium conducting communication signals, wherein a distal end of the medium conducting communication signals is provided for connection to a second receiving apparatus which is connected to a second communication interface that does not belong to the medical device via a communication network that does not belong to the medical device , wherein a communication path between the communication network and electrical components of the medical device which are inside the device and are communicatively connected to the first communication interface has at least two segments, and wherein at least one of the segments transmits communication signals in an electrically non-conductive manner and has electrical isolation between the input and the output or the output and the input of the segment with a predefined first dielectric strength, wherein the at least one segment of the communication path which transmits communication signals in an electrically non-conductive manner is arranged inside the housing of the medical device , and wherein a first circuit for converting electrical signals into optical signals and/or for converting optical signals into electrical signals is provided on or in the device , characterized in that the first circuit is supplied with electrical energy by a voltage supply (138; SR) arranged outside the medical device, wherein the voltage provided is below a predetermined maximum voltage which is considered to be safe. wherein the medical device also has a first receiving apparatus of a first communication interface (106-108), which receiving apparatus is accessible from outside the housing and is intended to receive a proximal end of a medium conducting communication signals, wherein a distal end of the medium conducting communication signals is provided for connection to a second receiving apparatus which is connected to a second communication interface that does not belong to the medical device via a communication network that does not belong to the medical device , wherein a communication path between the communication network and electrical components of the medical device which are inside the device and are communicatively connected to the first communication interface has at least two segments, and wherein at least one of the segments transmits communication signals in an electrically non-conductive manner and has electrical isolation between the input and the output or the output and the input of the segment with a predefined first dielectric strength, wherein the at least one segment of the communication path which transmits communication signals in an electrically non-conductive manner is arranged inside the housing of the medical device , and wherein a first circuit for converting electrical signals into optical signals and/or for converting optical signals into electrical signals is provided on or in the device , characterized in that the first circuit is supplied with electrical energy by a voltage supply (138; SR) arranged outside the medical device, wherein the voltage provided is below a predetermined maximum voltage which is considered to be safe. <EOS>