withdrawn from the device when full the container 38 may simply be emptied and then re positioned in the device but more preferably the container is disposable and is replaced by a new unused container although not shown the container may have a lid for sealing the top opening and desirably the lid is difficult or impossible to remove once it has been affixed to the container this reduces the risk of contamination from the container contents subsequent to the removal of the container from the device the device is normally used as follows a hypodermic syringe having an attached needle or needle sheath combination is held by the barrel and the needle or needle sheath is partially or completely inserted into the hole 12 using a free hand the user then squeezes end 22 and projection 25 together to cause wheels 15 16 17 to grip the needle or needle sheath and to cause the motor 30 to start operating the wheels cause the needle or needle sheath to rotate relative to the syringe which is still held by the user and this rotation eventually makes it possible to move the syringe away from the device while leaving the needle or needle sheath in the device if the needle or needle sheath does not initially rotate.