An intravenous catheter assembly, comprising: a catheter comprising a proximal end and a distal end; a catheter adapter comprising an inner wall forming a lumen, wherein the proximal end of the catheter is coupled with the catheter adapter; a needle comprising an elongated shaft and distal tip, wherein the needle is disposed within the catheter when the needle is in a ready position, wherein the needle is movable between the ready position in which the distal tip is outside of the catheter adapter and a retracted position in which the distal tip is disposed within the lumen of the catheter adapter; a needle guard, comprising: first and second distal walls (48a, b) that overlap one another and form a distal barrier to the needle when the needle is in the retracted position; a proximal end wall comprising an opening for receiving the needle therethrough; and first and second resilient arms (40a, b) comprising first and second curved portions, respectively, wherein the first and second resilient arms extend between the first and second distal walls, respectively, and the proximal end wall, wherein the first and second curved portions are urged by the elongated shaft into retaining contact with the inner wall of the catheter adapter when the needle is in the ready position and during movement of the needle between the ready position and the retracted position, wherein when the needle is in the retracted position, the elongated shaft no longer biases the first and second resilient arms outwardly such that the retaining contact between the first and second curved portions and the catheter adapter is released; and a housing coupled to the needle guard, wherein the housing and the needle guard enclose the distal tip when the needle is in the retracted position, wherein the housing is disposed within the lumen, wherein the housing comprises a first shield element and a second shield element opposite the first shield element, wherein the first and second shield elements are spaced apart by a gap, wherein the first and second resilient arms are urged outwardly by the elongated shaft and extend through the gap when the needle is in the ready position, wherein an inner edge of the first shield element comprises a snap feature, wherein the snap feature contacts an outer surface of the first resilient arm when the needle is in the retracted position, wherein the snap feature is a first snap feature, wherein an inner edge of the second shield element comprises a second snap feature, wherein first snap feature extends more inwardly than the second snap feature such that the first resilient arm passes the second snap feature before the first snap feature when the needle moves from the ready position to the retracted position. a catheter comprising a proximal end and a distal end; a catheter adapter comprising an inner wall forming a lumen, wherein the proximal end of the catheter is coupled with the catheter adapter; a needle comprising an elongated shaft and distal tip, wherein the needle is disposed within the catheter when the needle is in a ready position, wherein the needle is movable between the ready position in which the distal tip is outside of the catheter adapter and a retracted position in which the distal tip is disposed within the lumen of the catheter adapter; a needle guard, comprising: first and second distal walls (48a, b) that overlap one another and form a distal barrier to the needle when the needle is in the retracted position; a proximal end wall comprising an opening for receiving the needle therethrough; and first and second distal walls (48a, b) that overlap one another and form a distal barrier to the needle when the needle is in the retracted position; a proximal end wall comprising an opening for receiving the needle therethrough; and first and second resilient arms (40a, b) comprising first and second curved portions, respectively, wherein the first and second resilient arms extend between the first and second distal walls, respectively, and the proximal end wall, wherein the first and second curved portions are urged by the elongated shaft into retaining contact with the inner wall of the catheter adapter when the needle is in the ready position and during movement of the needle between the ready position and the retracted position, wherein when the needle is in the retracted position, the elongated shaft no longer biases the first and second resilient arms outwardly such that the retaining contact between the first and second curved portions and the catheter adapter is released; and a housing coupled to the needle guard, wherein the housing and the needle guard enclose the distal tip when the needle is in the retracted position, wherein the housing is disposed within the lumen, wherein the housing comprises a first shield element and a second shield element opposite the first shield element, wherein the first and second shield elements are spaced apart by a gap, wherein the first and second resilient arms are urged outwardly by the elongated shaft and extend through the gap when the needle is in the ready position, wherein an inner edge of the first shield element comprises a snap feature, wherein the snap feature contacts an outer surface of the first resilient arm when the needle is in the retracted position, wherein the snap feature is a first snap feature, wherein an inner edge of the second shield element comprises a second snap feature, wherein first snap feature extends more inwardly than the second snap feature such that the first resilient arm passes the second snap feature before the first snap feature when the needle moves from the ready position to the retracted position.