Patent ID: 8192402

Claim:
An access device for placing a medical article within a body space, comprising: a needle having a needle body and an interior bore; a dilator coaxially disposed about the needle body and having a dilator shaft; a medical article coaxially disposed about the dilator; a plurality of openings extending through a side of at least one of the needle body and the dilator shaft; at least one opening in the other one of the needle body and dilator shaft, the plurality of openings being spaced about the one of the needle body or dilator shaft so that at least one of the plurality of openings at least partially overlaps the at least one opening in the other one of the needle body and dilator shaft when the needle body is rotationally clocked relative to the dilator shaft in a first position and in a second position, the second position being different than the first position; a viewing space disposed between the dilator and the medical article; at least one passageway connecting the viewing space with the interior bore of the needle body, the passageway being defined at least in part by the plurality of openings and the at least one opening; a lock member configured to move between a lock state and an unlock state, the lock member connecting the needle to the dilator so as to inhibit at least relative axial movement between at least a portion of the needle and at least a portion of the dilator when the lock member is in at least the lock state; and a guidewire configured to be coaxially disposed within at least a portion of the needle body, the guidewire comprising a release member separable from the lock member and configured to engage with the lock member so as to at least move the lock member from the lock state to the unlock state when the guidewire is coaxially advanced within the needle body.