Medical apparatus and instruments; medical syringes including but not limited to disposable medical syringes; medical syringe needles; disposable plastic containers especially made for medical syringes; containers especially adapted for the disposal of medical instruments, syringes and other contaminated medical waste; needles and syringes for medical purposes; disposable hypodermic syringes and needles for medical and surgical use; disposable needles and syringes for dental, medical, and surgical purposes; cases, covers, and containers specially adapted for medical apparatus and equipment including needles and syringes; surgical, medical, dental and veterinary apparatus and instruments, artificial limbs, eyes and teeth; orthopaedic articles; suture materials; parts and fittings adaptable to a hypodermic needle, syringe, blood collection needle, blood collection tube holder (for medical use), namely, a mechanism comprising a plastic hinged cover which is placed over a needle after use and contains two locking clips inside the cover to lock over a needle and two locking mechanisms at the base of the cover to provide additional locking support