Safety cannula assembly

A safety cannula assembly, comprising:

• a cannula configured to puncture human or animal tissue, wherein the cannula includes a distal end portion including a tip;
• a sliding body including a distal end portion connected to the cannula and a proximal end portion connected to a flexible tube, wherein a flow connection extends through the sliding body between the tip of the cannula and a proximal end of the flexible tube;
• a main body in which the sliding body is displaceable from an operating position, where the tip of the cannula is located outside the main body to a safety position, where the tip of the cannula is located inside the main body, wherein a stop surface of the sliding body contacts a stop surface of the main body in the safety position, so that further axial displacement of the sliding body relative to the main body in the proximal direction is prevented;
• an actuation element arranged between the main body and the sliding body and configured to displace the sliding body from the operating position to the safety position;
• and
• a trigger mechanism arranged at the main body and configured to trigger the displacement of the sliding body from the operating position to the safety position, wherein the trigger mechanism includes at least one trigger member loadable by a radially oriented compressive force or loadable with a torque relative to the main body about a longitudinal axis of the main body, and a locking element displaceable from a locking position, where the locking element engages the sliding body and locks the sliding body in the operating position, to a trigger position, where the locking element is disengaged from the sliding body so that the sliding body moves into the safety position;
• a rotation blocking device which prevents a rotation of the sliding body arranged in the operating position about its longitudinal axis inside the main body, wherein the rotation blocking device includes at least one rotation blocking body of the sliding body and at least one rotation blocking body of the main body that cooperates with the at least one rotation blocking body of the sliding body,
• wherein the stop surface of the sliding body is arranged at the at least one rotation blocking body of the sliding body.