Given that we can already replace the heart with an artificial pump, filter toxins from the blood with dialysis, and nutrify the blood with IV drips; could a human be kept alive indefinitely with these interventions?

:Edit:

To clarify, I'm talking about future versions of current technology, which could miniaturized, which perform all of the above functions, and enable a person to continue living indefinitely.

Would the actual cells just stop replicating after time and the human fall apart, or would the continual supply of nutrified, oxygenated and cleansed blood be sufficient to keep someone alive?