I wonder if a surgeon could bypass and isolate from the digestive tract a sufficiently large section of the upper intestine to allow for a person to 'breathe' s

I wonder if a surgeon could bypass and isolate from the digestive tract a sufficiently large section of the upper intestine to allow for a person to 'breathe' synthetically for a period of time. Ideally without overly disrupting the digestive process. Could be useful for people waiting for lung transplants or who otherwise can't breath conventionally for an extended period.