urinary flow post surgery

My DH had back surgery on Monday, followed by a stroke on Tuesday. The doctors/nurses were amazing, performed a procedure where they went into the groin, up to his brain, and plucked out the clot. His right side was coming back in use within 2 hours. BUT, he's having trouble getting his "plumbing" back in working order. Both the stroke location (front lobe left side) and the surgery have placed a double whammy on his bladder and colon. He's taking Flomax with small success. Any suggestions to avoid having a catheter reinserted? Thanks so much.