A needle safety device has a collar and a housing pivotally connected thereto. Cooperating locking members are provided at the collar and the respective lower sections of the housing so that, once the housing is pivoted to be in alignment with the collar, the locking members would coactingly mate with...http://www.google.co.uk/patents/US6582397?utm_source=gb-gplus-sharePatent US6582397 - Needle safety device with antiremoval protection
