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Doctors Transplant Ear Of Human Cells, Made By 3-D Printer

Discussion in 'Otolaryngology' started by Mahmoud Abudeif, Jun 3, 2022.

  1. Mahmoud Abudeif

    Mahmoud Abudeif Golden Member

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    A 20-year-old woman who was born with a small and misshapen right ear has received a 3-D printed ear implant made from her own cells, the manufacturer announced on Thursday. Independent experts said that the transplant, part of the first clinical trial of a successful medical application of this technology, was a stunning advance in the field of tissue engineering.

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    The new ear was printed in a shape that precisely matched the woman’s left ear, according to 3DBio Therapeutics, a regenerative medicine company based in Queens. The new ear, transplanted in March, will continue to regenerate cartilage tissue, giving it the look and feel of a natural ear, the company said.

    “It’s definitely a big deal,” said Adam Feinberg, a professor of biomedical engineering and materials science and engineering at Carnegie Mellon University. Dr. Feinberg, who is not affiliated with 3DBio, is a co-founder of FluidForm, a regenerative medicine company that also uses 3-D printing. “It shows this technology is not an ‘if’ anymore, but a ‘when,’” he said.

    The results of the woman’s reconstructive surgery were announced by 3DBio in a news release. Citing proprietary concerns, the company has not publicly disclosed the technical details of the process, making it more difficult for outside experts to evaluate. The company said that federal regulators had reviewed the trial design and set strict manufacturing standards, and that the data would be published in a medical journal when the study was complete.

    3DBio’s success, seven years in the making, is one of several recent breakthroughs in the quest to improve organ and tissue transplants. In January, surgeons in Maryland transplanted a genetically modified pig’s heart into a 57-year-old man with heart disease, extending his life by two months. Scientists are also developing techniques to extend the life of donor organs so they do not go to waste; Swiss doctors reported this week that a patient who received a human liver that had been preserved for three days was still healthy a year later.

    United Therapeutics Corp., the company that provided the genetically engineered pig for the heart procedure, is also experimenting with 3-D printing to produce lungs for transplants, a spokesman said. And scientists from the Israel Institute of Technology reported in September that they had printed a network of blood vessels, which would be necessary to supply blood to implanted tissues.

    Companies have previously used 3-D printing technology to produce custom-fit prosthetic limbs made of plastic and lightweight metals. But the ear implant, made from a tiny glob of cells harvested from the woman’s misshapen ear, appears to be the first known example of a 3-D printed implant made of living tissues.

    The patient, who is from Mexico, was born with microtia, a rare birth defect that causes the auricle, or external part of the ear, to be small and malformed (it also can affect hearing in the ear). With more research, company executives said, the technology could be used to make many other replacement body parts, including spinal discs, noses, knee menisci, rotator cuffs and reconstructive tissue for lumpectomies. Further down the road, they said, 3-D printing could even produce far more complex vital organs, like livers, kidneys and pancreases.

    “This is so exciting, sometimes I have to temper myself a little bit,” said Dr. Arturo Bonilla, a pediatric ear reconstructive surgeon in San Antonio who performed the woman’s implant surgery. The trial was funded by 3DBio Therapeutics, but Dr. Bonilla does not have any financial stake in the company. “If everything goes as planned, this will revolutionize the way this is done,” he said.

    James Iatridis, who heads a spine bioengineering laboratory at Mount Sinai’s Icahn School of Medicine, said that other printed tissue implants were in the pipeline, but that he was unaware of any other products being tested in a clinical trial.

    “The 3-D ear implant is then a proof of concept to evaluate biocompatibility, and shape matching and shape retention, in living people,” Dr. Iatridis said.

    Still, the external part of the ear is a relatively simple appendage that is more cosmetic than functional, said Dr. Feinberg of Carnegie Mellon. He cautioned that the path toward solid organs — like livers, kidneys, hearts and lungs — was still a long one. “Just going from an ear to a spinal disc is a pretty big jump, but it’s more realistic if you’ve got the ear,” he said.

    The 3-D printing manufacturing process creates a solid, three-dimensional object from a digital model. The technology generally involves a computer-controlled printer depositing material in thin layers to create the precise shape of the object.

    The new ear implant from 3DBio Therapeutics integrates several proprietary technologies, executives said, beginning with a method for turning a small sample of a patient’s cells into billions of cells. The company’s 3-D printer uses a collagen-based “bio ink” that is safe in the body and that keeps all of the materials sterile.

    All of the research and manufacturing takes place under one roof, in a new, unassuming brick building in Queens equipped with hygienic “clean rooms” that are staffed by masked technicians wearing bunny suit coveralls, gloves and bootees.

    “It comes in as a biopsy from the patient, and it leaves a living ear,” Daniel Cohen, 3DBio’s chief executive and co-founder, explained during a tour of the facility last week.

    The patient who received the new ear was one of the first to have had a successful transplant as part of the clinical trial led by Dr. Bonilla. (Trial volunteers are also being enrolled at Cedars-Sinai Medical Center in Los Angeles.)

    The surgeon began by removing half of a gram of cartilage from the woman’s microtia ear remnant. He then shipped that, along with a 3-D scan of her healthy ear, from San Antonio to the 3DBio building in Long Island City, Queens.

    At the facility, the patient’s chondrocytes — cells responsible for cartilage formation — were isolated from the tissue sample and grown in a proprietary slurry of nutrients, proliferating into billions of cells.

    The living cells were then mixed with the company’s collagen-based bio-ink, “like chocolate chips mixed into cookie dough ice cream,” according to Nathaniel Bachrach, 3DBio’s chief scientific officer.

    The collagen was inserted through a syringe into the specialized 3-D bio-printer, which squirted out the material from a nozzle in a steady, thin stream, zipping around to create a small oblong shape that was a mirror replica of the patient’s healthy ear. The entire printing process lasted less than 10 minutes.

    The printed ear shape was then encased in a protective biodegradable shell and shipped overnight in cold storage to Dr. Bonilla. He then implanted the ear under the patient’s skin, just above her jawbone. When the skin was tightened around the implant, the shape of an ear emerged.

    Roughly 1,500 babies born in the United States each year have either microtia or a related condition, anotia, in which the entire external ear is missing. The clinical trial so far has included 11 volunteers, ages 6 to 25, who will be followed for five years to evaluate long-term safety and aesthetic outcomes.

    Another option for microtia reconstruction — which is often done while the patients are young so they aren’t subjected to bullying or ridicule when they start school — requires inpatient surgery to harvest cartilage from the patient’s ribs, which is then carved into an approximate shape of the ear, Dr. Bonilla said.

    But the new procedure can be done in a few hours, and outside of a hospital. 3DBio did not specify what it would charge for the implant, but a spokeswoman said the pricing would be in line with the cost of the current standard of care.

    “I’ve always felt the whole microtia world has been waiting for a technology where we wouldn’t have to go into the chest, and patients would heal from one day to the next,” Dr. Bonilla said.

    The patient, Alexa, who asked to be identified only by her first name because of privacy concerns, said she was excited about the new ear, even though it was still covered by a bandage. Though many children with microtia are teased by their peers, which can lead to anxiety, depression and hostility, Alexa said she was never very bothered by it until her teen years, when she became more self-conscious about her appearance.

    “You care a little more for your image when you’re a teenager,” she said. “Some people said things that were not thoughtful, and it started bothering me.”

    Alexa said she had perfected the art of covering her right ear by wearing her hair long and loose, and most people could not even tell that she was missing an ear. But now, she said, she is looking forward to having fun with her hair, putting it back in pigtails or up in a bun.

    “I think my self-esteem will go up,” she said.

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