This is what I found on Web MD:
The world’s first complete 3D printer-generated heart, made using the patient’s own cells and materials, has been created in a lab. Until now, success has been limited to printing only simple tissues without blood vessels.
“This is the first time anyone anywhere has successfully engineered and printed an entire heart replete with cells, blood vessels, ventricles and chambers,” said team leader Tal Dvir.
The printer-generated heart is only about a third the size of an actual human heart — and it doesn’t actually work. But it’s a groundbreaking step toward engineering customized organs that can be transplanted with less risk of rejection.
“This heart is made from human cells and patient-specific biological materials,” said Dvir, a researcher at the Sagol Center for Regenerative Biotechnology at Tel Aviv University in Israel. “In our process these materials serve as the bio-inks, substances made of sugars and proteins that can be used for 3D printing of complex tissue models.”
Dvir noted that scientists have managed to print a 3D structure of a heart before, but not with cells or blood vessels. “Our results demonstrate the potential of our approach for engineering personalized tissue and organ replacement in the future,” he said in a university news release.
Information provided by Web MD.
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