A needlestick prevention device for an injection device having a hollow needle(3) comprises a sheath (1) for attachment to the injection device. The sheath(1) has three positions. In a first, inoperative position the sheath (1) sealinglyencloses the needle (3). In a second operative position a first part (4) of thesheath (1) is removed, a second part (5) remains attached to the injection deviceand a third part (6) is pivoted about a hinge (16) to expose the needle. In a third,cover position the third part (6) is pivoted about the hinge (16) to cover at leastthe 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 to manufactureand use.
