Apparatus for use in conjunction with an intraosseous device comprises a skin engageable plate formed with an aperture adjoining a skin site to be penetrated by an intraosseous device and with a pointer which is unmistakenly indicative of a location of a prominent or protruding anatomical feature and which is sized such that a distance from a terminal end of the pointer to the site-adjoining aperture corresponds to patient-specific dimensions from the anatomical feature to the penetration site and an annular guide channel surrounding the site-adjoining aperture and protruding proximally from the skin engageable plate, for stabilizing a stylet which is introducible through the aperture to penetrate an adjoining anatomical structure along a confirmed path of penetration coinciding with the penetration site into a selected bone while producing a substantially uniform bore at the penetration site as it is advancing along the path of penetration.
