A syringe device (10) which is not reusable after the first delivery stroke. The syringe has a hollow body (11) slidably containing a plunger (12) in fluid sealing relationship. The plunger (12) has a plunger rod (13) which includes a guide arrangement (17) receiving and guiding a locking member (18)....http://www.google.com.au/patents/US5290235?utm_source=gb-gplus-sharePatent US5290235 - Non-reusable syringe
