Abstract: An oxygenator may include a housing extending from a first end to a second end, and a bundle of hollow gas exchange fibers extending between the first end and the second end. At least a portion of the housing may be configured to selectively move radially with respect to the bundle of hollow gas exchange fibers. An oxygenator may include a rigid housing extending from a first end to a second end, a flexible housing disposed within the rigid housing, and a bundle of hollow gas exchange fibers extending between the first end and the second end within the flexible housing. At least a portion of the flexible housing may be configured to selectively move radially with respect to the bundle of hollow gas exchange fibers.

Abstract: An oxygenator may include a housing extending from a first end to a second end along a central longitudinal axis, a first end cap, a second end cap, and a bundle of hollow gas exchange fibers extending between the first end and the second end. The first end cap and the second end cap may each be rotatable about the central longitudinal axis. An oxygenator may include a bundle of hollow gas exchange fibers extending from the first end cap to the second end cap. An oxygenator may include a housing including a first axially expandable portion, a second axially expandable portion, and a rigid tubular portion disposed between and fixedly attached to the first and second axially expandable portions. An oxygenator may include a bundle of hollow gas exchange fibers may be axially movable relative to the housing.

Abstract: A paracorporeal respiratory assist lung is configured with an annular cylindrical hollow fiber membrane (fiber bundle) that is rotated at rapidly varying speeds. Fluid (for example, blood) is introduced to the center of the device and is passed radially through the fiber bundle. The bundle is rotated at rapidly changing velocities with a rotational actuator (for example, a motor or magnetic coupling). The rotation of the fiber bundle provides centrifugal kinetic energy to the fluid giving the device pumping capabilities and may create Taylor vortexes to increase mass transfer. Rotation of the fiber bundle increases the relative velocity between the fluid and the hollow fibers and increases the mass transfer. The porosity of the fiber bundle may be varied to enhance gas exchange with the blood. Alternatively, a rotating core may be used with a stationary fiber bundle.