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See-Through Heating Pad Could Help Prevent Burns from Thermotherapy

February 23, 2017 By American Chemical Society

To soothe aches and pains, many people turn to heating pads, patches or creams.

Although a common practice, thermotherapy can cause burns.

Now researchers are developing a transparent heating pad that allows users to see through it to monitor their skin’s color and prevent such injuries. They report their approach in the journal ACS Applied Materials & Interfaces.

Thermotherapy pads help treat a range of conditions including rheumatoid arthritis. However, they’ve been known to cause burns, particularly among people who fall asleep with their heating pads on or among the elderly or others who might not be very sensitive to heat.

Part of the problem is that commercial heating pads are opaque, and users can’t see how their skin is reacting to the therapy. Other researchers have developed transparent alternatives, but they were ultimately too stiff, costly or brittle.

Wei Lan and colleagues wanted to address this problem by developing a flexible, see-through device.

To make their thermotherapy pad, the researchers embedded conductive silver nanowires in a thin polyvinyl alcohol film. They then enveloped the film and a copper electrode in biocompatible polydimethylsiloxane, a type of silicone, to insulate the heating element and protect a user’s skin.

Testing showed that the transparent device heated quickly when three volts were applied, which is the typical voltage of coin-cell batteries used in watches, remotes and other small electronics.

It was also very flexible and worked well even after being bent 10,000 times.

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