October 14, 2007
Originally Published MPMN October 2007
Thermoelectric Generator Converts Waste Heat into Energy
A thermoelectric generator from Nextreme can be embedded into implantable devices to provide localized temperature control for medical therapy.
A miniature, thin-film thermoelectric generator (TEG) converts heat directly into electricity and is suited for waste-heat conversion applications. Developed by Nextreme, the TEG can be integrated into implantable devices and has potential for reducing the effects of seizures, as well as for pain management, cancer treatment, and drug-delivery applications.
Providing power densities greater than 3 W/cm2, the TEG exceeds those achieved using bulk materials and delivers a form factor that can be as much as 20 times thinner than bulk-material alternatives, according to Nextreme.
The compact product can be embedded into such devices as probes, catheters, and surgical tools, where it provides precise localized heating or cooling to the applied area. It can also maintain local temperature. The area affected by the TEG can range from 0.3 × 0.3 up to 20 × 20 mm. Operating in a steady or cyclical manner, the device offers microscale thermal control at specific contained regions of the body.
“In environments where a lot of heat is available, we have demonstrated power levels of up to 300 mW with devices that are not much bigger than a piece of confetti,” says Seri Lee, Nextreme chief technology officer. “And, in low-grade thermal environments, we have demonstrated microwatts of power—enough thermal energy conversion to power remote sensors and other distributed devices.”
TEG devices generate electricity via the Seebeck Effect, in which electricity is produced from a temperature differential applied across the device. The product has demonstrated output power levels of greater than 100 mW at a temperature difference of 70 K, and greater than 300 mW at a temperature difference of 120 K. With modules measuring 3.5 × 3.5 mm, the TEG has output power densities of an estimated 1–3 W/cm2.
Nextreme, Research Triangle Park, NC
Copyright ©2007 Medical Product Manufacturing News
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