An automatic needle retracting mechanism (1) for a hypodermic syringe (2) comprises a body (3) which slidingly supports a needle (27). A retainer (9) for an actuator (8) and the needle (27) is kept in a retaining position by a spacer (11), which after some time in contact with an injectant loses its...http://www.google.com.au/patents/US6716197?utm_source=gb-gplus-sharePatent US6716197 - Needle retracting mechanism, needle holder and hypodermic syringe
