Cardiopulmonary Bypass System Pre-bypass filter HB (Cardiopulmonary Bypass System Priming and Recirculation filter) Filter for system priming and recirculation prior to cardiopulmonary bypass. ■Pore Size : 0.2μm ■Membrane Area : 1,000㎠ ■Priming Volume : 46mL ■Dual Port Connector : 3/8 and 1/4 inch tubes