A syringe is disclosed for taking blood samples which includes a tubular body, a plunger, a sealing member and a needle. The plunger and sealing member in combination are slideably received in the tubular body with the plunger receiving the sealing member for rotational movement about its longitudinal...http://www.google.es/patents/US4206768?utm_source=gb-gplus-sharePatente US4206768 - Syringe device with means for selectively isolating a blood sample after removal of contaminates
Syringe device with means for selectively isolating a blood sample after ...
