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16 Feb 2023 - 18 Feb 2023

Screen-Printed Wearable Electronics Can Be Used for Health Monitoring in Hospitals

By HospiMedica International staff writers
Posted on 13 Jan 2023
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Image: A set of screen-printed electrodes (Photo courtesy of Washington State University)
Image: A set of screen-printed electrodes (Photo courtesy of Washington State University)

New research has shown that the same technology used to print rock concert t-shirts can also help to create the glittering, serpentine structures which power wearable electronics.

In a study led by Washington State University (Pullman, WA, USA), researchers demonstrated that it is possible to make electrodes using just screen printing by creating a stretchable, durable circuit pattern which can be transferred to fabric and worn directly on the human skin. These wearable electronics can be used for monitoring the health of patients admitted in hospitals or being treated at home. Currently, commercial manufacturing of wearable electronics involves expensive processes that require clean rooms. Screen printing is used by some for parts of the process, although the new method relies completely on screen printing, making it advantageous for manufacturers and consumers.

In their study, published in the ACS Applied Materials and Interfaces journal, the researchers have detailed the electrode screen-printing process and demonstrated how the produced electrodes can be used for electrocardiogram monitoring, or ECG. Using a multi-step process to layer polymer and metal inks, the researchers created snake-like structures of the electrode. The resulting thin pattern looks delicate, although the electrodes are not fragile. The study demonstrated that the electrodes can be stretched by 30% and bent to 180 degrees.

Multiple electrodes are printed onto a pre-treated glass slide, allowing them to be easily peeled off and transferred onto fabric or other material. After printing the electrodes, they were transferred onto an adhesive fabric which was worn directly on the skin by the subjects. The researchers found that the wireless electrodes accurately recorded heart and respiratory rates, and transmitted the data to a mobile phone. The main focus of the study was on ECG monitoring, although the screen-printing process can be utilized to make electrodes for different applications, including those with functions similar to those of smart watches or fitness trackers, according to the researchers. The team is currently working on expanding the technology for printing different electrodes as well as entire electronic chips and even potentially, whole circuit boards.

“We wanted to make flexible, wearable electronics in a way that is much easier, more convenient and lower cost,” said corresponding author Jong-Hoon Kim, associate professor at the WSU Vancouver’s School of Engineering and Computer Science. “That’s why we focused on screen printing: it’s easy to use. It has a simple setup, and it is suitable for mass production.”

Related Links:
Washington State University

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