Exploring How Electronic Tattoos Function

Sounds incredible, right?

Picture futuristic bikers showing off glowing bicep skulls, or the electric hum of beachside tramp stamps. Maybe the future is filled with dazzling electronic dolphin tattoos and neon crosses on our backs.

If that’s where your imagination is headed, here’s the reality check: These aren't the electronic tattoos you’re thinking of. But the technology discussed here is even more mind-blowing – it could save countless lives and eventually become a core part of medical practices. In the future, it might even redefine what it means to be human.

What we're discussing here are epidermal electronics: ultra-thin, flexible rubber patches embedded with equally flexible electrical components -- silicon wires that are only nanometers thick [source: Hamzelou].

This thin elastic technology is essentially a temporary tattoo -- similar to those peel-off tattoos you used to get from bubblegum wrappers. While those tattoos used glue and ink to transfer designs, epidermal electronics attach to the skin differently. They mold to the skin's contours, staying securely in place for several days.

However, an electronic tattoo doesn’t resemble a fierce dragon; instead, it looks more like a delicate circuitry-laden sticker. It also won’t make your classmates think you spent the summer in a Chinese street gang. Instead, it tracks your vital signs -- listening to the signals from your body and transmitting that information to doctors who help keep you alive.

So, how’s that for a bit of ink?

I Sing the Tattoo Electric

You can say what you like about modern medicine, but there’s no part of the human body that technology can’t examine with precision. Whether it’s brain scans or blood tests, you’re just a needle prick, a skull cap, and a few electrodes away from a flood of results. But this is also the reason extended monitoring outside a hospital is difficult.

After all, a police informant wouldn’t enter a dangerous meeting with a bulky audio recorder, would he? No, he’d go for a discreet wire, something unobtrusive that wouldn’t attract attention or disrupt his look. Similarly, no one wants to carry around a heavy battery pack and deal with skin-irritating suction cups for everyday health tracking.

This is where epidermal electronics have the potential to revolutionize things, enabling continuous health monitoring in real-world situations without the usual drawbacks.

Dr. John A. Rogers from the University of Illinois at Urbana-Champaign saw the potential of electronic tattoos back in 2008 and founded his 'electronics everywhere' (and he really means everywhere) company MC10. With expertise in both applied physics and chemical engineering, Rogers aimed to bridge the divide between man and machine in healthcare by making electronics more organic. In short, he sought to create technology that adapts to the dynamic, unpredictable, and sometimes uncomfortable nature of our bodies in motion.

Silicon posed the first major challenge in the world of skin-friendly cybernetics. Surprisingly, this material doesn’t come from Hollywood breast implants but from a raw, gray crystal pulled from the Earth. From this, we fashion the fragile computer chips that power much of our modern, tech-driven lives.

How do you make this rigid, inflexible technology bend and stretch? Rogers and his team devised a clever solution by arranging tiny silicon wires into spiraling patterns and embedding them in thin rubber patches. These coils expand, contract, and connect all the device's components, including sensors, antennas, and LED lights.

Need an EEG to track your brain waves? Simply stick a patch on your forehead, spray some over-the-counter liquid bandage, and go back to enjoying your day at the beach. The patch collects solar energy, monitors your vitals, and sends the data to an external device. Earlier versions required a wired connection between the patch and the computer, but Rogers' team is working on enhancing wireless transmission systems — including WiFi and network compatibility.

Early electronic tattoos were designed to track muscle, heart, and brain activity. From there, the developers branched out into monitoring pregnancy in humans and even stimulating muscle movement in rats. Rogers has also introduced the technology beneath the skin, using stretchable electronics inserted into the human heart through a balloon catheter.

And if you think all of this sounds futuristic, just wait until you hear about what Rogers has in store for the future.

The Future of Electronic Tattoos

While electronic tattoos might not be on the shelves at your local hospital just yet, Dr. John A. Rogers and his team at MC10 are already dreaming up a future shaped by epidermal electronics.

More than just passive monitors of the human body, Rogers envisions electronic tattoos as active participants in rehabilitation. By stimulating muscle contractions, these patches could assist patients in regaining the ability to walk after long periods of immobility. The technology could also revolutionize prosthetic limb use, acting as a critical bridge between biology and machines.

For example, one of Rogers' researchers attached an epidermal electronic device to his neck and used muscle movements to control a video game. He spoke a word, and the virtual world responded. From this, the researchers foresee a future where these patches detect muscle movements from speech, enabling the mute to communicate and allowing secret military personnel to silently transmit messages to their base [source: Gonzalez].

From this moment on, it's easy to envision not just enhanced prosthetic limbs and robotic exoskeletons, but a complete fusion of man and machine. Biological signals govern machine actions, while electronic pulses guide movements in the human body. In this way, humanity could evolve into a true cyborg race — not one where humans are broken down to fit the rigid demands of technology, but rather where technology is shaped to fit the flexible, nuanced nature of the human form.

Of course, this could also mean some seriously cool video game controllers for everyone. But before we reach that stage, where the line between human and Mario fades completely, Rogers aims to "eliminate the need for surgical interventions in the first place" [source: Ornes].

Now, don’t you think that sounds a bit more impressive than a glowing pectoral flag tattoo?