What is a manmade heart commonly known as?

The term "artificial heart" is widely recognized and used to refer to a manmade device designed to replace the function of a biological heart. This term encompasses various forms of heart devices that assist or fully replicate the heart's pumping action when the natural heart is not able to do so effectively due to disease or failure.

The phrase "total artificial heart" refers specifically to a type of artificial heart that completely replaces the biological heart, rather than just assisting it. While this is an accurate definition of some devices, the broader category of devices that assist the heart falls under the term "artificial heart."

The term "mechanical heart" can sometimes be informally used, but it’s less specific and not as commonly accepted in clinical terminology. Similarly, "cardiac substitute" is not a widely recognized term and may cause confusion as it does not specifically denote a fully artificial heart or its purpose.

Using "artificial heart" effectively captures the essence of various devices designed to replace or support heart function, making it the correct and preferred answer in this context.