Self-Powered Smart Implants for Spinal Fusion Surgery Monitor Healing

Spinal fusion - fusing two vertebrae together - can treat a wide variety of spinal disorders. Often, surgeons will use a cage to provide support where the disk once was between the vertebrae. But what if those cages could support the spine’s healing in more ways than one? Now, researchers are creating patient-specific 3D-printed smart metamaterial implants that double as sensors to monitor spinal healing.

Researchers at the University of Pittsburgh (Pittsburgh, PA, USA) have developed a new class of multifunctional mechanical metamaterials, which act as their own sensors, recording and relaying important information about the pressure and stresses on its structure. The so-called “meta-tribomaterials” a.k.a. self-aware metamaterials, generate their own power and can be used for a wide array of sensing and monitoring applications.

The material is designed such that under pressure, contact-electrification occurs between its conductive and dielectric microlayers, creating an electric charge that relays information about the condition of the material matrix. In addition, it naturally inherits the outstanding mechanical tunability of standard metamaterials. The power generated using its built-in triboelectric nanogenerator mechanism eliminates the need for a separate power source, and a tiny chip records data about the pressure on the cage, which is an important indicator of healing. The data can then be read noninvasively using a portable ultrasound scanner.

Not only is the proposed cage unique in its sensing capabilities, but it’s also made of a highly tunable material that can be customized to the patient’s needs. The researchers have successfully tested the device in human cadavers and are looking to move on to animal models next. Because the material itself is incredibly tunable and scalable, the smart sensor design could be adapted to many other medical applications in the future, like cardiovascular stents or components for knee or hip replacements.

“Spinal fusion cages are being widely used in spinal fusion surgeries, but they’re usually made of titanium or PEEK polymer materials (a semi-crystalline, high-performance engineering thermoplastic) with certain mechanical properties,” said Amir Alavi, assistant professor of civil and environmental engineering at the University of Pittsburgh. “The stiffness of our metamaterial interbody cages can be readily tuned. The implant can be 3D-printed based on the patient’s specific anatomy before surgery, making it a much more natural fit.”

“This is a first-of-its-kind implant that leverages advances in nanogenerators and metamaterial to build multifunctionality into the fabric of medical implants,” added Alavi. “This technological advancement is going to play a major part in the future of implantable devices.”

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