Scientists at Newcastle University have created the world’s first 3D-printed human cornea using stem cells. This medical breakthrough could help more than 10 million people across the globe who are at risk of going blind due to corneal diseases or injuries.
The research published in the journal Experimental Eye Research shows that it is possible to 3D-print a human cornea using a special gel that keeps the cells alive. This gel, known as bio-ink, is made from a mix of alginate and collagen, two natural materials that are both soft and strong. The stem cells used in the bio-ink were taken from a healthy human donor.
The printing process is fast and simple. In just 10 minutes, a low-cost 3D bio-printer can print a cornea in the exact shape and size needed. The printed structure was built in circular layers and shaped just like a real cornea.
Most importantly, the live stem cells inside the cornea remained healthy. Tests showed that 92 percent of the cells were alive after one day, and over 80 percent were still alive after one week.
Professor Che Connon, who led the research team, said many scientists around the world have been working to find the perfect bio-ink for printing tissues.
He explained, “Our unique gel, a combination of alginate and collagen keeps the stem cells alive while producing a material that is stiff enough to hold its shape but soft enough to be squeezed out of a 3D printer nozzle.”
This is not the first time Professor Connon and his team have worked on keeping cells alive in gels. But now, they have gone a step further by creating a ready-to-use bio-ink that can be used to print corneas right away, without needing to grow the cells separately.
The most exciting part of this technology is the ability to create corneas that are customized for each patient. By scanning the patient’s eye, doctors can collect the exact measurements and use them to print a cornea that fits perfectly. This approach could help solve the global shortage of donor corneas.
Professor Connon said, “We can now print a cornea using data taken from a patient’s own eye. This could change how we treat vision loss all around the world.”
The shortage of donated corneas is a serious problem. Around 10 million people need surgery to avoid losing their sight because of infections like trachoma, a disease that affects the eye. Another 5 million people are already blind due to scarring caused by burns, injuries, or disease.
In many parts of the world, it is difficult to find enough donors, and patients often have to wait a long time for a transplant. This 3D printing method could offer a new and faster way to give people their sight back.
Dr. Steve Swioklo, a researcher involved in the project, watched as the 3D printer carefully printed out the shape of a human cornea. He said, “It was amazing to see it happen in real-time. The printed cornea held its shape, and the cells stayed alive, which is very important for the success of tissue engineering.”
The research team is hopeful about the future, but they also know that more testing is needed. The printed corneas must be studied further to see if they can fully support the growth of other important cells in the eye. Scientists will also need to test whether the printed tissue can work as well as a real human cornea in the long term.
Professor Connon added, “Our 3D-printed corneas will now have to go through more tests. It will be a few years before we can use them in real transplant surgeries. But we have shown that it is possible to print corneas using patient-specific data, and that is a big step forward.”
