A needle shielding system, comprising: a needle having a tubular shaft with an outer diameter and a distal end and a proximal end, a needle tip at the distal end, and an interlocking feature near the needle tip; an inner tube having an inner diameter greater than the outer diameter of the needle, the inner tube also having an outer diameter; a safety clip preventing the needle tip from extending distally beyond the clip after the needle tip is withdrawn proximally past the clip, by engaging or closing in a manner that prevents the needle tip from reentering the clip, a barrier within the inner tube coming into contact with the interlocking feature when withdrawing the interlocking feature and tip of the needle from the clip, wherein the inner tube includes a proximal end, the barrier being at the proximal end, and a section capable of housing the needle tip and interlocking feature between the safety clip and the barrier when the interlocking feature is adjacent the barrier, the barrier halting the progression of the interlocking feature in a proximal direction, an outer tube having an inner diameter greater than the outer diameter of the inner tube, the outer tube also having an outer diameter; and a catheter housing having an inner diameter greater than the outer diameter of the outer tube; wherein the inner tube is coaxial with and telescopes within the outer tube, wherein the outer tube includes a longitudinal axis and an outer surface characterized in that the outer tube further comprises an interlock formed on the outer surface of the outer tube, and includes multiple slits formed along at least a portion of the outer tube along the longitudinal axis, forming a plurality of flexible fingers able to flex inwardly, the outer tube is advanceable from a proximal end of the catheter housing towards a distal end of the catheter housing until the interlock of the outer tube engages with an interlock mate on the inner surface of the catheter housing, and the interlock of the outer tube includes multiple annular end flanges at a distal end that extend radially outwardly from the longitudinal axis and from the distal ends of the multiple fingers and are adapted to engage the interlock mate of the catheter housing. a needle having a tubular shaft with an outer diameter and a distal end and a proximal end, a needle tip at the distal end, and an interlocking feature near the needle tip; an inner tube having an inner diameter greater than the outer diameter of the needle, the inner tube also having an outer diameter; a safety clip preventing the needle tip from extending distally beyond the clip after the needle tip is withdrawn proximally past the clip, by engaging or closing in a manner that prevents the needle tip from reentering the clip, a barrier within the inner tube coming into contact with the interlocking feature when withdrawing the interlocking feature and tip of the needle from the clip, wherein the inner tube includes a proximal end, the barrier being at the proximal end, and a section capable of housing the needle tip and interlocking feature between the safety clip and the barrier when the interlocking feature is adjacent the barrier, the barrier halting the progression of the interlocking feature in a proximal direction, an outer tube having an inner diameter greater than the outer diameter of the inner tube, the outer tube also having an outer diameter; and a catheter housing having an inner diameter greater than the outer diameter of the outer tube; wherein the inner tube is coaxial with and telescopes within the outer tube, wherein the outer tube includes a longitudinal axis and an outer surface characterized in that the outer tube further comprises an interlock formed on the outer surface of the outer tube, and includes multiple slits formed along at least a portion of the outer tube along the longitudinal axis, forming a plurality of flexible fingers able to flex inwardly, the outer tube is advanceable from a proximal end of the catheter housing towards a distal end of the catheter housing until the interlock of the outer tube engages with an interlock mate on the inner surface of the catheter housing, and the interlock of the outer tube includes multiple annular end flanges at a distal end that extend radially outwardly from the longitudinal axis and from the distal ends of the multiple fingers and are adapted to engage the interlock mate of the catheter housing.