Before revision: After each use, a heparin lock is made by injecting a small amount of heparinized saline (an anticoagulant) into the device, preventing development of clots within the port or catheter.
After revision: After every cycle of chemotherapy, the port should be flushed with 1:10 diluted heparin (5000 IU/ml) to prevent clot formation within the port or catheter.