Abstract: The present invention comprises an improved medical introducer device that comprises a releasably locking dilator and circumscribing sheath as well as a tactile indicator to conveniently inform a user of the device whether the dilator/sheath assembly is in a locked or unlocked position. In preferred aspects, the introducer device also includes a visual indicator to provide visual indication to a device user that the dilator and sheath are either in a locked or unlocked position, and a lead-in section at the sheath proximal end to facilitate insertion of a dilator, guide wire, catheter, etc. through the device.