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In page Artificial heart:

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The working life of a more recent prototype, using various polymers instead of silicone,[citation needed] was still limited, according to reports in early 2018, with that model providing a useful life of 1 million heartbeats, roughly ten days in a human body.[7] At the time, Cohrs and his team were experimenting with CAD software and 3D printing, striving to develop a model that would last up to 15 years, though Cohrs noted a timeline on the process was hard to predict.[citation needed]