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3-D Printer Creates Implant to Keep Mich. Baby Breathing

Liz Szabo, @LizSzabo, USA TODAY

05/29/2013

Researchers at the University of Michigan have used a 3-D printer to create a custom-made, lifesaving implant for a baby boy, they report in a letter in The New England Journal of Medicine.

The baby, Kaiba Gionfriddo, suffered from a rare disorder in which one of the airways in his lungs collapsed when he exhaled. The problem caused him to stop breathing and turn blue when he was only 6 weeks old. Even with a mechanical ventilator, Kaiba stopped breathing virtually every day, requiring doctors to perform emergency resuscitations.

"We'd recently had a child in the hospital who died of this, and I said, 'There has got to be a solution that we can find for these kids,'" says co-author Glenn Green, Kaiba's doctor and an associate professor of otolaryngology.

So Green and his Michigan colleagues tried something new.

Using a 3-D printer, they custom-built a tiny, flexible splint that will grow with Kaiba. Researchers used a special material designed to be absorbed by Kaiba's body in about three years, says co-author Scott Hollister, a professor of biomedical and mechanical engineering.

The porous splint is made from the same material as dissolvable stitches, Green says.

Instead of making a cast of Kaiba's airway with plaster, they used a CT scanner, which gave them a 3-D blueprint.

Like a vacuum-cleaner hose, the C-shaped splint is flexible enough to move when Kaiba breathes. But it's also firm enough to prevent his air tube from flopping shut, Green says.

Kaiba was able to come off the ventilator three weeks after his surgery in February 2012. "Our prediction is that this will be a cure for him," Green says. "The splint will go away and the process will be done."

About one in 2,200 babies are born with Kaiba's condition, called tracheobronchomalaci. Most grow out of it by age 2 or 3.

Now 19 months old, Kaiba is breathing well, although he still has a tracheostomy tube, which allows air into his windpipe, says his mother, April Gionfriddo of Youngstown, Ohio.

"We're really relieved and happy that he's not turning blue anymore," says Gionfriddo, noting that Kaiba has battled multiple complex health problems, including a hernia, asthma and anatomic defects in several blood vessels. He also had surgery to treat hydrocephalus, in which fluid presses on the brain.

Other surgeons praised the Michigan team's ingenuity.

"It's hugely fascinating," says Sidhu Gangadharan, chief of thoracic surgery at Beth Israel Deaconess Medical Center in Boston, who wasn't involved with Kaiba's care. "They had a really unique problem and they came up with a unique solution."

Gangadharan says his hospital probably will follow this example in designing medical devices with 3-D printers. Because Kaiba's life was in immediate jeopardy, the Food and Drug Administration gave doctors emergency clearance to produce the device. The 3-D printer allowed doctors to produce the splint quickly, Hollister says. The printers work somewhat like inkjet printers. But instead of squirting out layers of ink, they lay down layers of a biopolymer.

The same technology could be used to custom-engineer a variety of implants, such as facial bones, Hollister says. He and Green already have built ears and noses based on patient scans, although these have not yet been transplanted into people.

Scientists also are using 3-D printers to build "scaffolds" for tissue engineering, with the aim of making blood vessels and other replacement body parts, says Anthony Atala, director of the Wake Forest Institute for Regenerative Medicine in North Carolina.