A catheter system, comprising: a catheter adapter, comprising a distal end, a proximal end, and a wall forming a lumen, wherein the wall comprises a slot; a catheter extending distally from the distal end of the catheter adapter; a needle assembly coupled to the catheter adapter, the needle assembly comprising: an introducer needle, comprising a distal tip and a bump feature, wherein the distal tip is disposed distal to the catheter in a first position; a housing, comprising: a distal opening; a proximal opening, wherein a diameter of the proximal opening is less than an outer diameter of the bump feature; and a side opening, wherein a proximal end of the side opening is distal to a proximal end of the slot; and a spring clip disposed within the housing, wherein the spring clip comprises a first end and a second end, wherein the first end comprises a U-shaped portion partially disposed within the slot, wherein the proximal end of the side opening is disposed within the U-shaped portion to bias the U-shaped portion outwardly, wherein the U-shaped portion does not contact the introducer needle, wherein in response to withdrawal of the distal tip proximally from the first position to a second position, the bump feature contacts the proximal opening, wherein in response to withdrawal of the distal tip proximally from the second position to a third position, the housing and the proximal end of the side opening move proximally, the U-shaped portion is released and moves inwardly, and the spring clip blocks the distal opening. a catheter adapter, comprising a distal end, a proximal end, and a wall forming a lumen, wherein the wall comprises a slot; a catheter extending distally from the distal end of the catheter adapter; a needle assembly coupled to the catheter adapter, the needle assembly comprising: an introducer needle, comprising a distal tip and a bump feature, wherein the distal tip is disposed distal to the catheter in a first position; a housing, comprising: a distal opening; a proximal opening, wherein a diameter of the proximal opening is less than an outer diameter of the bump feature; and a side opening, wherein a proximal end of the side opening is distal to a proximal end of the slot; and a spring clip disposed within the housing, wherein the spring clip comprises a first end and a second end, wherein the first end comprises a U-shaped portion partially disposed within the slot, wherein the proximal end of the side opening is disposed within the U-shaped portion to bias the U-shaped portion outwardly, wherein the U-shaped portion does not contact the introducer needle, wherein in response to withdrawal of the distal tip proximally from the first position to a second position, the bump feature contacts the proximal opening, wherein in response to withdrawal of the distal tip proximally from the second position to a third position, the housing and the proximal end of the side opening move proximally, the U-shaped portion is released and moves inwardly, and the spring clip blocks the distal opening. an introducer needle, comprising a distal tip and a bump feature, wherein the distal tip is disposed distal to the catheter in a first position; a housing, comprising: a distal opening; a proximal opening, wherein a diameter of the proximal opening is less than an outer diameter of the bump feature; and a side opening, wherein a proximal end of the side opening is distal to a proximal end of the slot; and a distal opening; a proximal opening, wherein a diameter of the proximal opening is less than an outer diameter of the bump feature; and a side opening, wherein a proximal end of the side opening is distal to a proximal end of the slot; and a spring clip disposed within the housing, wherein the spring clip comprises a first end and a second end, wherein the first end comprises a U-shaped portion partially disposed within the slot, wherein the proximal end of the side opening is disposed within the U-shaped portion to bias the U-shaped portion outwardly, wherein the U-shaped portion does not contact the introducer needle, wherein in response to withdrawal of the distal tip proximally from the first position to a second position, the bump feature contacts the proximal opening, wherein in response to withdrawal of the distal tip proximally from the second position to a third position, the housing and the proximal end of the side opening move proximally, the U-shaped portion is released and moves inwardly, and the spring clip blocks the distal opening.