The artificial heart be invented various years ago and is still used today beside some?

The artificial heart was invented many years ago and is still used today with some (though not complete) nouns . Yet artificial versions of other organs, like liver for example, have never be produced, Why is that?
Answers:
The heart is a simple pump, not a complex organ like the liver, which is the metabolic center of the body.
You could call a dialysis machine an artificial kidney, and a cardiac bypass electrical device is a combined heart and lung machine. You may argue that they cannot be implanted, which is true, but the power source for the artificial heart remains external too.

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