44 MEDICAL APPARATUS-NAMELY, BLOOD OXYGENATORS, CARDIOTOMY RESERVOIRS, CARDIOTOMY RESERVOIR HOLDERS AND ADAPTER ARMS, TUBING, DISPOSABLE CONNECTORS AND LOCK NUTS FOR TUBING, PORT AND COVER CAP ASSEMBLIES, BLOOD PUMPS, BLOOD TRANSFUSION SYSTEMS COMPRISING A PUMP AND RESERVOIR CONNECTED BY TUBING, WATER SAFETY ASSEMBLIES, LOW BLOOD LEVEL ALARMS AND OXYGEN ANALYZERS AND DISPOSABLE PROBES FOR USE THEREWITH