A conduit tube that communicates with an intracardiac blood inflow port and a liquid medicine injection port and allows blood from the intracardiac blood inflow port and a liquid medicine from the liquid medicine injection port to flow into a cardiotomy section is inserted from above downward in the cardiotomy section 2. The attenuator includes a divider to divide an input signal into two signals, a phase shifter to shift a phase of one of output signals of the divider, and a combiner to combine an output of the phase shifter with another of output signals of the divider. Further data corresponding to start menu interaction is received, and action is taken via based on the further interaction. The optical structure may also be used to produce more saturated colors for a wider display color gamut and also may be used to produce a brighter backlight structure through light recycling of the wider bandwidth light back into the optical structure.