In Penn State’s Materials Research Institute, an electrical engineer and a biomaterials engineer have joined their expertise to develop a flexible, biodegradable optical fiber to deliver light into the body for medical applications.
Currently, people are using glass fiber to get light into the biological tissue at depth, but glass is brittle and is not biodegradable. It can break and damage tissue if implanted. Researchers are beginning to look toward flexible polymer fibers as a solution. Yang previously invented a polymer based on citrate, a naturally occurring key ingredient in metabolism, that he developed as a general platform for biomedical applications, such as biodegradable bone screws for bone fixation, scaffolds for tissue engineering and nanoparticles for delivering time-released therapeutic drugs. Now, Yang is collaborating with Zhiwen Liu, Penn State professor of electrical engineering, on using Yang’s citrate-based polymer to create a step-index optical fiber for light delivery inside the body.