Biphasic foam blood mass transfer device

A blood oxygenator comprising:

• a housing;
• a body of hydrophilic, open-cell biphasic foam disposed within said housing;
• blood connection means connected to said housing for transporting blood into and out of said body;
• a first phase of said body including a first gas permeable membrane comprised of a first foam which creates first phase interconnected cells and unsealed cells;
• a second phase of said body including a second gas permeable membrane comprised of a second foam which creates second phase interconnected which are smaller than said first phase interconnected cells so that a gas distribution pathway is formed in the interstitial space between said first phase interconnected cells and said second phase interconnected cells, said second phase interconnected cells defining a channel within said body, said channel forming a blood pathway, wherein said second gas permeable membrane separates said blood pathway from said gas distribution pathway so that water from blood in said blood pathway wets said second gas permeable membrane such that oxygen within said gas pathway dissolves in the water, whereby oxygen is transferred across said second gas permeable membrane into the blood and carbon dioxide is transferred across said second gas permeable membrane out of the blood.