A device for a hypodermic needle comprises a connector for connecting to a hypodermic needle, a sheath (22) which in use surrounds the hypodermic needle and a biasing device (24) between the connector and the sheath. The sheath is moveable between a first position into which it is biased by the biasing device and a second retracted position against the force of the biasing device, so that in use, the tip of the hypodermic needle is covered in the first position but a defined length of the hypodermic needle is exposed in the second position. The device also sets the position of the angle of the hypodermic needle and locks the sheath over the needle after use.
