An extravascular system for accessing the vasculature of a patient, comprising: a catheter adapter having a distal end supporting a catheter, and further comprising a proximal opening, the catheter adapter having a lumen; an introducer needle comprising a sharpened tip and a needle feature; a blood control septum valve including a plurality of grooves forming air channels on an outer circumferential surface of the septum valve, said septum valve being the only valve disposed within the lumen of the catheter adapter and dividing the lumen into a proximal fluid chamber and a distal fluid chamber, the plurality of grooves communicating between the proximal and distal fluid chambers; a septum activator movably positioned within the proximal fluid chamber, the septum activator having a base and a probe end; and a needle shield removably coupled to the proximal opening of the catheter adapter and comprising a safety clip, wherein the safety clip is biased away from a distal aperture of the needle shield when the needle is disposed within the distal aperture, characterized in that: in response to the sharpened tip of the needle being withdrawn into the needle shield beyond the distal aperture, the safety clip is released from the biased position and blocks the distal aperture thereby preventing the sharpened tip from exiting a distal end of the needle shield, and the needle shield further comprises a washer, wherein the washer comprises an aperture configured to prevent passage of the needle feature. a catheter adapter having a distal end supporting a catheter, and further comprising a proximal opening, the catheter adapter having a lumen; an introducer needle comprising a sharpened tip and a needle feature; a blood control septum valve including a plurality of grooves forming air channels on an outer circumferential surface of the septum valve, said septum valve being the only valve disposed within the lumen of the catheter adapter and dividing the lumen into a proximal fluid chamber and a distal fluid chamber, the plurality of grooves communicating between the proximal and distal fluid chambers; a septum activator movably positioned within the proximal fluid chamber, the septum activator having a base and a probe end; and a needle shield removably coupled to the proximal opening of the catheter adapter and comprising a safety clip, wherein the safety clip is biased away from a distal aperture of the needle shield when the needle is disposed within the distal aperture, characterized in that: in response to the sharpened tip of the needle being withdrawn into the needle shield beyond the distal aperture, the safety clip is released from the biased position and blocks the distal aperture thereby preventing the sharpened tip from exiting a distal end of the needle shield, and the needle shield further comprises a washer, wherein the washer comprises an aperture configured to prevent passage of the needle feature. in response to the sharpened tip of the needle being withdrawn into the needle shield beyond the distal aperture, the safety clip is released from the biased position and blocks the distal aperture thereby preventing the sharpened tip from exiting a distal end of the needle shield, and the needle shield further comprises a washer, wherein the washer comprises an aperture configured to prevent passage of the needle feature.