Abstract: A dialysis apparatus has a replenisher passage selectively connectable to an arterial side passage (pre-replenishment) or a venous side passage (post-replenishment) in a blood circuit. A supply side pressure sensor measures a pressure of a dialysate supply passage and a collection side pressure sensor measures a pressure of a dialysate collection passage. The connection passages each have one end communicating with the arterial side passage or the venous side passage of the blood circuit and another end connected to the dialysate collection passage. It is determined whether the replenisher passage is connected to the arterial side passage or the venous side passage, based on a differential pressure of pressures measured by the supply side pressure sensor and the collection side pressure sensor, in a state where a dialysate pump (liquid delivery device) causes dialysate to flow into the blood circuit from the replenisher passage.

Abstract: A reciprocating compressor 1A includes a compression part 2 compressing, by a piston 6, gas sucked into a cylinder 4 through a suction valve 36, and discharging the compressed gas through a discharge valve 51, a piston drive part 3 supplying a force to the piston 6 to reciprocate the piston 6 via a piston rod 9 coupled to the piston 6, and a housing 17 accommodating the compression part 2 and forming a vacuum region around the compression part 2.