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In page Artificial heart:

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The soft total artificial heart (sTAH) is a silicone monoblock fabricated with the help of 3D bioprinting technology. It weighs 390g, has a volume of 679 cm3, and is operated through pressurized air. The stated goal of their sTAH is to "develop an artificial heart that is roughly the same size as the patient's own one and which imitates the human heart as closely as possible in form and function".[4] The sTAH fundamentally moves and works like a natural heart, but the prototype only performed for 3000 beats (about 30 to 50 minutes at an average heart rate)[5] in a hybrid mock circulation machine[citation needed] before the silicone membrane (2.3 mm thick) between the Left Ventricle and the Air Expansion Chamber ruptured.[6]