Medical connector with automatic sealing on disconnection

A first connector part comprising:

• an elongate base body with a lumen for conducting a fluid;
• a first threaded portion that is arranged at an outer side of the base body and that enables a releasable connection of the first connector part to a correspondingly matched second connector part;
• a sealing pin that has a lumen arranged in the lumen of the elongate base body so that fluid is capable of flowing through and/or around the sealing pin and the lumen of the elongate base body;
• and
• a second threaded portion that is arranged at an inner side of the elongate base body at a lumen side and that enables a releasable connection of the first connector part to the sealing pin that is correspondingly matched to the second threaded portion, wherein
• the thread pitch of the first threaded portion differs from the thread pitch of the second threaded portion,
• the sealing pin furthermore has a bounding element that restricts a rotation of the sealing pin to one direction, and
• the sealing pin has a fixing element at the end opposite the bounding element, wherein the sealing pin is capable of being releasably or non-releasably fixed to a closure element via a latched connection and/or via an undercut.