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. <；Figure 18>；
