An access device for placing a medical article within a body space, comprising: a needle including a needle body having a longitudinal axis with a distal tip and a needle hub from which the needle body extends; a dilator including a dilator shaft and a dilator hub, the dilator shaft being disposed on and slideable along the needle body with the dilator hub being disposed distal of the needle hub; and a medical article comprising a tubular section and a hub, the tubular section being disposed on and slideable along the dilator with the hub being disposed distal of the dilator hub; wherein the access device further comprises: a track extending from the dilator hub in a proximal direction; a locking mechanism operably disposed between the track and the needle so as to selectively inhibit proximal movement of the needle relative to the dilator; a guidewire, the needle body and the guidewire being coaxially disposed with the guidewire slideable through at least a portion of the needle body, wherein the guidewire comprises a wire and a hub, the hub being configured to engage with the needle hub; and a second locking mechanism operably disposed between the track and the guidewire hub, the second locking mechanism being configured to selectively release the guidewire hub from the track so as to allow the guidewire hub to move in a distal direction as the guidewire slides through the needle body. a needle including a needle body having a longitudinal axis with a distal tip and a needle hub from which the needle body extends; a dilator including a dilator shaft and a dilator hub, the dilator shaft being disposed on and slideable along the needle body with the dilator hub being disposed distal of the needle hub; and a medical article comprising a tubular section and a hub, the tubular section being disposed on and slideable along the dilator with the hub being disposed distal of the dilator hub; wherein the access device further comprises: a track extending from the dilator hub in a proximal direction; a locking mechanism operably disposed between the track and the needle so as to selectively inhibit proximal movement of the needle relative to the dilator; a guidewire, the needle body and the guidewire being coaxially disposed with the guidewire slideable through at least a portion of the needle body, wherein the guidewire comprises a wire and a hub, the hub being configured to engage with the needle hub; and a second locking mechanism operably disposed between the track and the guidewire hub, the second locking mechanism being configured to selectively release the guidewire hub from the track so as to allow the guidewire hub to move in a distal direction as the guidewire slides through the needle body. a track extending from the dilator hub in a proximal direction; a locking mechanism operably disposed between the track and the needle so as to selectively inhibit proximal movement of the needle relative to the dilator; a guidewire, the needle body and the guidewire being coaxially disposed with the guidewire slideable through at least a portion of the needle body, wherein the guidewire comprises a wire and a hub, the hub being configured to engage with the needle hub; and a second locking mechanism operably disposed between the track and the guidewire hub, the second locking mechanism being configured to selectively release the guidewire hub from the track so as to allow the guidewire hub to move in a distal direction as the guidewire slides through the needle body.