Orbital rim fractures refer to injury to the bony outer edges of the eye socket and it takes a great deal of force to make them occur, such as in car accidents. Blowout fractures happen when the rim stays intact, but a crack forms in the very thin bone that makes up the floor of the eye socket. A direct orbital floor fracture means the rim fractures have extended into the “floor” of the eye socket.
Every year in the United States, some 2.5 million traumatic eye injuries occur and that number includes orbital fractures, and males are about four times more likely than females to sustain such fractures. They’re usually caused by a blunt object striking the eye socket, and they can result in blurry, decreased, or double vision, among a host of other problems.
In the case of smaller fractures, treatment with an ice pack, antibiotics, and decongestants can be enough to let the eye socket to heal on its own.
But for larger, more complicated fractures, ophthalmologists may be forced to perform surgical procedures to repair the fracture.
In the past, ophthalmic surgeons created those implants with a titanium mesh, a thin piece of polyethylene, or sometimes both, but they were required to form the structures by hand.
Doctors at the Hong Kong Polytechnic University’s Industrial Center are now using 3D printed models meant to improve orbital implant surgery by reducing operating times and building more accurate implants which are custom tailored to each patient.
Taking information derived from each patient’s CT scan and X-ray data, the team in Hong Kong reconstruct the “orbital floor” of a patient’s eye socket with CAD software, and then 3D prints two layered molds – an upper and lower – into which they press a thin titanium sheet.
Using PC-ISO, a bio-compatible thermoplastic which can be used to print heat-resistant, bio-compatible surgical parts that can be sterilized, the surgeons can then implant the necessary structures.
“Surgeons would only need to sterilize the mold and form the implant shape by pressing the two parts together, resulting in an accurate, customized implant,” says Louis Sze, a PhD Candidate in Orthopedics and Traumatology at Hong Kong Polytechnic University.
The Hong Kong Polytechnic University Industrial Center currently supplies a range of customized surgical guides for orbital implants, orthopedic pre-surgery models, and dental models. The various parts, built with the Fortus 3D Production System, are also used as instruments to allow doctors and students to better train using these accurate anatomical models and implants.
Do you know of any other processes in the medical field which rely on 3D printing to make them more accurate or safer? Let us know in the Orbital Eye Socket Fractures forum thread on 3DPB.com.
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