An intraosseous device comprises a stylet (1) with a pointed end (103) for penetrating bone and a cannula (3) through which the stylet extends. The stylet (1) has a bent portion (10) which is engaged in a receiver (11) in a handle cover (7). The cannula (3) has an outwardly extending flare (20) which is engaged in a corresponding seat (21) in a hub (6). The handle and the hub have formations (41, 42) which interlock with one another when the tip (103) of the stylet (1) is aligned with the tip of the cannula (3). The interlock formations (41, 42) further assist torque transmission. The configuration ensures that the maximum manual torque can be applied to penetrate bone whilst ensuring that the stylet (1) and cannula (3) are aligned for maximum cutting efficiency and remain fixed to the handle (7) and the hub (6) respectively.
