A disposable disease control syringe which reduces the frequency of accidental needle strikes to health care workers and prevents health-threatening reuse of the needle cannula by drug abusers. The syringe includes a cylinder having an open proximal end, a substantially closed distal end, and a retractable...http://www.google.es/patents/US4804370?utm_source=gb-gplus-sharePatente US4804370 - Disease control syringe having a retractable needle
Disease control syringe having a retractable needle
