A safety device for a needle is provided. The device includes a spring biased sheath which acts to cover the needle before and after use. The safety device also includes a spring biased lock which is operable to lock the sheath in a safe position unless the biasing force of the lock is countered by a...http://www.google.es/patents/US7320682?utm_source=gb-gplus-sharePatente US7320682 - Safety device
