Apparatus and method for intraluminal membrane oxygenation of internal organs. A catheter having a walled chamber is introduced to dispose the chamber against the lumen of an internal organ. The wall of the chamber is of a material which is freely permeable to gases, such as oxygen and carbon dioxide, and poorly permeable to liquid. Oxygen is introduced into the catheter and perfused through the walled chamber. Oxygen passes through the wall of the chamber to the organ while carbon dioxide from the organ passes through the wall of the chamber.
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