There is disclosed various embodiments of an implantable anchor for permanently anchoring a medical lead or catheter. Capacitance C1 is short-circuited by the TFTs. Image information captured of the user during this process can be used to correlate the user’s eye position in the image with the corresponding gaze location on the device, in order to calibrate the gaze tracking in a way that is substantially transparent to the user. The arresting element can be actuated by a bimetallic adjusting element, which can be heated by a heating element, and by an actuator system that, at the same time, is actively connected to the turning catch in a direct manner. AR to AR transmit the Router Advertisement RA generated by MAP to MN in communication.