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Hypertension is not caused by the heart pumping too well, so this would not work for the purpose of curing hypertension. But if you could invent a durable heart replacement therapy, you'd save a lot of lives.

If the pressures in a system are too high (mechanical or biological) the pump is usually not the culprit.

See, ECMO. Although it can save one's life where perfusion is otherwise inadequate, it is extremely difficult to initiate and maintain.