Baby’s life saved with 3D printed device to restore breathing
May 24, 2013
A bioresorbable splint used for first time, successfully stopped life-threatening tracheobronchomalacia, a case featured in New England Journal of Medicine.
Every day, a baby, Kaiba, stopped breathing, his collapsed bronchus blocking the crucial flow of air to his lungs. Parents April and Bryan Gionfriddo watched helplessly.
They found hope at the University of Michigan, where a new, bioresorbable device that could help Kaiba was under development. Kaiba’s doctors contacted Glenn Green, M.D., associate professor of pediatric otolaryngology at the University of Michigan.
Green and his colleague, Scott Hollister, Ph.D., professor of biomedical engineering and mechanical engineering and associate professor of surgery at U-M, obtained emergency clearance from the Food and Drug Administration to create and implant a tracheal splint for Kaiba made from a biopolymer called polycaprolactone.
On February 9, 2012, the specially-designed splint was placed in Kaiba at C.S. Mott Children’s Hospital. The splint was sewn around Kaiba’s airway to expand the bronchus and give it a skeleton to aid proper growth. Over about three years, the splint will be reabsorbed by the body. The case is featured in the New England Journal of Medicine (open access).
“It was amazing. As soon as the splint was put in, the lungs started going up and down for the first time and we knew he was going to be OK,” says Green.
Green and Hollister were able to make the custom-designed, custom-fabricated device using high-resolution imaging and computer-aided design. The device was created directly from a CT scan of Kaiba’s trachea/bronchus, integrating an image-based computer model with laser-based 3D printing to produce the splint.
Kaiba was off ventilator support 21 days after the procedure, and has not had breathing trouble since then.
“The material we used is a nice choice for this. It takes about two to three years for the trachea to remodel and grow into a healthy state, and that’s about how long this material will take to dissolve into the body,” says Hollister.
“Kaiba’s case is definitely the highlight of my career so far. To actually build something that a surgeon can use to save a person’s life? It’s a tremendous feeling.”
The image-based design and 3D biomaterial printing process can be adapted to build and reconstruct a number of tissue structures. Green and Hollister have already utilized the process to build and test patient specific ear and nose structures in pre-clinical models. In addition, the method has been used by Hollister with collaborators to rebuild bone structures (spine, craniofacial and long bone) in pre-clinical models.
Severe tracheobronchomalacia is rare. About 1 in 2,200 babies are born with tracheomalacia and most children grow out of it by age 2 or 3, although it often is misdiagnosed as asthma that doesn’t respond to treatment.
Severe cases, like Kaiba’s, are about 10 percent of that number. And they are frightening, says Green. A normal cold can cause a baby to stop breathing. In Kaiba’s case, the family was out at a restaurant when he was six weeks old and he turned blue.
“Severe tracheobronchomalacia has been a condition that has bothered me for years,” says Green. “I’ve seen children die from it. To see this device work, it’s a major accomplishment and offers hope for these children.”
Before the device was placed, Kaiba continued to stop breathing on a regular basis and required resuscitation daily.
“Even with the best treatments available, he continued to have these episodes. He was imminently going to die. The physician treating him in Ohio knew there was no other option, other than our device in development here,” Green says.
Kaiba is doing well and he and his family, including an older brother and sister, live in Ohio.