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Home Health

Smart implants monitor spinal fusion healing

by Francesco Mazzagatti
June 28, 2022
in Health
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New research introduces self-Powered smart implants to monitor spinal fusion healing

Source: Credit: University of Pittsburgh

The Intelligent Structural Monitoring and Response Testing (iSMaRT) Lab has 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.

“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,” explained Alavi. “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.”

The team has 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.

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

A paper detailing the work was published in Advanced Functional Materials.

Source: University of Pittsburgh

Source: Healthcare in Europe

Tags: 3d printingsmart metamaterialspinal fusion healing

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