Research engineers are developing smart implants that can both monitor and promote healing in fractured bones. When installed at the fracture site, these implants, which are constructed using shape memory alloys, can stiffen or relax in a continuously controlled manner that optimizes bone healing.

As part of an EU-funded project, the researchers are miniaturizing the technology for use in thin intramedullary nails (IMNs), which provide internal support and stability during the healing process. It will also integrate data from an electronic nose — a passive sensor that monitors chemicals excreted from the skin or breath, which are rich in physiological data. This additional layer of information will enhance the device’s diagnostic capacity and provide an increasingly complete picture of a person’s health.

Two miniature actuators working in opposite directions are configured so that one of them pulls a rod with a conical head into the opening of a soft, elastically compliant sleeve. Once in position, the cone-shaped head is held securely in position and is later withdrawn from the sleeve by the second actuator. When the conical head is inserted into the interior of the elastomeric sleeve, the IMN stiffens at this point but does not expand in size. When the rod is later retracted from the sleeve, the IMN becomes softer again. (Image credit: Oliver Dietze)

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Topics:
Implants & Prosthetics Materials Medical Polymers

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