A delivery system for placement of a leadless pacemaker device in a human body

A delivery system for placement of a leadless pacemaker device in a human body, the delivery system comprising:

• a catheter device for insertion into a human body, said catheter device having a lumen and a distal end region to be inserted into the human body, the lumen being configured to receive a leadless pacemaker device in the distal end region of the catheter device;
• and
• a first mapping electrode and a second mapping electrode disposed in the distal end region of the catheter device for sensing, in a mapping mode, a mapping signal between the first mapping electrode and the second mapping electrode;
• wherein the first mapping electrode is arranged on a mapping extension that protrudes from a sidewall of the distal end region of the catheter device towards a central axis of the catheter device, the central axis extending in a longitudinal extension direction of the catheter device;
• wherein the mapping extension is movable with respect to the sidewall of the distal end region of the catheter device between a non-mapping position and a mapping position, wherein an angle between the mapping extension and a virtual plane extending perpendicular to the central axis is bigger than 5° in the non-mapping position and lies in a range of from 0° to 5° in the mapping position;
• and
• wherein the second mapping electrode is arranged on an outside of the sidewall in the distal end region of the catheter device.