A two-part test cartridge for use in a centrifugal analyzer for measuring the concentration of different electrolytes in blood or blood serum samples has one part which is disposable and which is characterized by a sample entry port, one or more filled calibrant chambers, a waste chamber and passages...http://www.google.es/patents/US4940527?utm_source=gb-gplus-sharePatente US4940527 - Two-part test cartridge for centrifuge
