A needlestick prevention device for an injection device having a hollow needle(3) comprises a sheath (1) for attachmentto the injection device. The sheath (1) has three positions. In a first,inoperative position the sheath (1) sealingly enclosesthe needle (3). In a second operative position a first part (4) of the sheath(1) is removed, a second part (5) remains attached to theinjection device and a third part (6) is pivoted about a hinge (16) to exposethe needle. In a third, cover position the third part (6)is pivoted about the hinge (16) to cover at least the tip of the needle (3)and is retained in position by retaining means (19) actingbetween the second part (5) and the third part (6). The device is simple tomanufacture and use.
