Catheter system having a vent plug and related methods

A method of observing blood flashback to confirm placement of a catheter within a blood

• vessel, the method comprising:
• inserting a catheter system into a patient, wherein the catheter system comprises:
• a catheter adapter, comprising a distal end and a proximal end;
• a catheter extending distally from the distal end of the catheter adapter;
• an extension tube in fluid communication with the catheter adapter and the catheter;
• a connector proximal to the extension tube and in fluid communication with the extension tube, wherein the connector comprises a body and a septum disposed within the body;
• and
• a vent plug movable from a first position to a second position, wherein when the catheter system is inserted into the blood vessel, the vent plug is in the first position, wherein the vent plug comprises a venting pathway, wherein the venting pathway is permeable to air and not blood, wherein when the vent plug is in the first position, the septum seals the body such that the catheter system is a closed catheter system,
• after inserting the catheter system into the patient, moving the vent plug from the first position to the second position, wherein in response to movement of the vent plug from the first position to the second position, the vent plug penetrates the septum such that air is vented through the septum and the vent plug and the blood flashback is observed in the extension tube.