Abstract: An oxygenator that inhibits or prevents bubbles in blood from exiting through a blood outlet includes an oxygenator part which performs gas exchange on blood and a heat exchanging part which performs heat exchange on the blood. The oxygenators part has a housing that is generally in a rectangular parallelepiped form, with a hollow fiber membrane bundle positioned in the housing. The hollow fiber membrane bundle is formed by a multiplicity of hollow fiber membranes adapted to perform gas exchange. Blood flows along a blood passage comprised of gaps between the hollow fiber membranes and contacts the surface of the hollow fiber membranes where gas exchange occurs with gas flowing through the lumens of the hollow fiber membranes. In addition, a filter member is arranged on a downstream side of the hollow fiber membrane bundle so that bubbles present in the blood are caught by the filter member.

Abstract: An artificial lung includes a housing, a tubular hollow yarn film bundle contained in the housing and providing a multiplicity of hollow yarn films having a gas exchange function, a gas inflow port and a gas outflow port communicating with each other through hollow portions of the hollow yarn films, and a blood inflow port and a blood outflow port through which blood is distributed. The tubular hollow yarn film bundle has a cylindrical overall shape, and a filter member having a bubble-trapping function is provided on an outer peripheral portion of the tubular hollow yarn film bundle.

Abstract: A delivery blood storing member-equipped blood reservoir tank has a blood reservoir tank portion, and a delivery blood storing member that communicates with a blood outlet formed in the blood reservoir tank portion. The delivery blood storing member allows blood to flow out of an interior thereof when pressed from outside. The delivery blood storing member reserves amounts of blood in accordance with the height of liquid surface in the blood reservoir tank portion if the amount of blood in the blood reservoir tank portion becomes equal to or less than a predetermined value. The delivery blood storing member includes a body part that is formed from a hard material, and a flexible diaphragm whose peripheral end is fixed to the delivery blood storing member body part. The diaphragm produces substantially no self-restoring force against deformation.

Abstract: A blood reservoir includes a blood tank, a blood accumulator connected in fluid communication with an outlet of the tank for receiving blood from the tank, and a pumping device for driving the accumulator to displace blood out of the accumulator. The accumulator typically in the form of a flexible bag is adapted to store blood in an amount proportional to the volume of blood in the tank when the volume of blood in the tank is reduced below a predetermined value. The pumping device is operated for intermittent blood delivery and can regulate the amount of blood displaced out of the accumulator.