A new "bioprosthetic" device takes the concept of an artificial heart to a new level with its ability to sense and respond to a patient's level of exertion. The design by France's Carmat includes two chambers that are each divided by a membrane holding hydraulic fluid on one side. Blood flows through the other side of each membrane, with the blood-facing side made of tissue from a cow's heart, rendering it more biocompatible.

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