Release date: 2016-03-08 Scientists are increasingly approaching the use of 3D bioprinters to print human organs. This sounds like a science fiction movie, but it is approaching reality. Not long ago, Tiangong Society reported that the Institute of Regenerative Medicine at Wake Forest University in North Carolina had created a 3D printer that could make organs, tissues and bones. Today, researchers at the University of Denver use a bio-based 3D printer to print an artificial heart valve. According to BioBots, the maker of the 3D bioprinter, the machine enables researchers to create custom replicas of organs, tissues and other parts. Source: Tiangongshe
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The significance of this matter is that scientists at the University of Denver use a much simpler biological 3D printer, BioBot 1, which is one of the cheapest 3D bioprinters on the market and sells for only $10,000. Moreover, this machine comes from a 3D printing shop outside the Denver University. 
Scientists at the University of Denver primarily print 3D copies of heart valves based on patient MRI and CT scan data. The project's graduate assistant, Ben Stewart, created a sample in just 22 minutes. "It exactly matches the shape of the patient's heart valve." Stewart said, after printing the finished product, it was a small elastic cylinder.
But Stewart said that in order to function in the human body, it needs to be placed in a container called a bioreactor, in which scientists inject human cells. Ideally, these cells will attach to a replica of the heart valve, which then grow into a tissue or structure of similar shape. The printed replica of the heart valve is broken down in the process, and Stewart likens it to a scaffolding that builds a heart valve.
“These are native fibers and native cells that replace the entire “scaffoldingâ€, leaving only natural, real blood vessels,†he said.
However, scientists nowadays 3D prints the simplest part of the heart - the valve, 3D prints a really beating heart, they still have a long way to go, but this is where the scientists aim . Even now, this technology is valuable for children who need to replace heart valves because they now have to rely on prostheses.
"The kind of (prosthetic) valve can't grow with the child's growth," said Dr. Ali Azadani, director of the Heart Biomechanics Laboratory at the University of Denver. "So those patients usually have to undergo multiple surgeries and constantly change their aorta." Valves. This is very harmful to their body. By designing a tissue-engineered valve, we are able to implant a heart valve that can grow with the children."