A needle shield device, comprising: a needle housing, comprising: an elongated body having a distal end, a proximal end, and a slot disposed between the distal end and the proximal end, wherein a distal portion of the slot is sealed; and a nose portion coupled to the distal end of the elongated body and configured to be inserted into a catheter adapter; and a needle assembly slideably coupled to the needle housing, comprising: an introducer needle comprising a sharp distal tip and a proximal end; a needle grip; and a needle hub having a protuberance, wherein the proximal end of the introducer needle is secured within the needle hub, wherein the protuberance is coupled to the needle grip, wherein the protuberance slideably fits within the slot, wherein the needle assembly is moveable between a distal position and a proximal position with respect to the needle housing, wherein in response to movement of the needle assembly to the proximal position, the sharp distal tip is disposed within the needle housing, characterized in that the nose portion comprises an elongated extension disposed outside of the elongated body and extending in a proximal direction from the distal end of the elongated body and configured to seal the distal portion of the slot. a needle housing, comprising: an elongated body having a distal end, a proximal end, and a slot disposed between the distal end and the proximal end, wherein a distal portion of the slot is sealed; and a nose portion coupled to the distal end of the elongated body and configured to be inserted into a catheter adapter; and an elongated body having a distal end, a proximal end, and a slot disposed between the distal end and the proximal end, wherein a distal portion of the slot is sealed; and a nose portion coupled to the distal end of the elongated body and configured to be inserted into a catheter adapter; and a needle assembly slideably coupled to the needle housing, comprising: an introducer needle comprising a sharp distal tip and a proximal end; a needle grip; and a needle hub having a protuberance, wherein the proximal end of the introducer needle is secured within the needle hub, wherein the protuberance is coupled to the needle grip, wherein the protuberance slideably fits within the slot, wherein the needle assembly is moveable between a distal position and a proximal position with respect to the needle housing, wherein in response to movement of the needle assembly to the proximal position, the sharp distal tip is disposed within the needle housing, characterized in that the nose portion comprises an elongated extension disposed outside of the elongated body and extending in a proximal direction from the distal end of the elongated body and configured to seal the distal portion of the slot. an introducer needle comprising a sharp distal tip and a proximal end; a needle grip; and a needle hub having a protuberance, wherein the proximal end of the introducer needle is secured within the needle hub, wherein the protuberance is coupled to the needle grip, wherein the protuberance slideably fits within the slot, wherein the needle assembly is moveable between a distal position and a proximal position with respect to the needle housing, wherein in response to movement of the needle assembly to the proximal position, the sharp distal tip is disposed within the needle housing, characterized in that the nose portion comprises an elongated extension disposed outside of the elongated body and extending in a proximal direction from the distal end of the elongated body and configured to seal the distal portion of the slot.