FDM 임플란트가 Oreo의 걸음에 활기를 되찾아 줍니다.

Real solution.

“The tool we developed combines the two existing tools into a single unit,” says design engineer Richard Franks. “As the surgeon squeezes two handle pieces together, the ratchet tightens the screws.” The engineers produced a working polycarbonate ratchet strong enough to withstand testing on stainless steel set-screws and durable enough to survive an autoclave. In addition, says senior engineering manager Troy McDonald, “Surgeons are really rough on these prototypes while trying them out, so we have got to have tough material. FDM gave us the strength and durability we needed.”

To help Oreo, OIC obtained a donated patella that was used to generate a scaled digitized copy. A biomedical engineer then converted the file into a computer-aided design (CAD) model. X-ray radiographs of Oreo’s other patella were then used to modify the CAD design to match his femur.

 

“In Oreo’s case, we were able to produce a custom-tailored implant in only four days including design, analysis, physical testing, and manufacturing. As we move down the learning curve, it will probably be possible to produce similar implants in only a day or two.”

3D printed implant.

OIC built an artificial patella using FDM® technology, an additive manufacturing process that builds plastic parts layer-by-layer from CAD files, on its Stratasys® 3D printer using PC-ISO™ biocompatible polycarbonate (ISO 10993 USP Class VI). Physical testing was performed on the implant to validate its ability to provide the necessary mechanical strength. The implant was sterilized using ethylene oxide at 54°C (130°F) for one hour. During Oreo’s surgery, the implant was attached to the tendon and quadriceps using polypropylene sutures.