Oh, brace yourselves for the latest episode of “Honey, I Shrunk the Brain Gadget!” In this thrilling saga, our intrepid scientists have managed to cram a whole circus of deep brain stimulation (DBS) tech into a teeny-tiny hat for rats. Yes, you heard it right, folks—a fully implantable, battery-free DBS system that’s about as big as a peanut.

Crafted from the ever-so-chic liquid crystal polymer (LCP), which is not only biocompatible but also promises to stick around longer than your average reality TV star, this little wonder is the belle of the ball in the rodent rave. It’s got everything: a stimulator circuit, a receiver coil, and a 20 mm long electrode array that’s ready to party deep in the brain—all wrapped up in a dome-shaped package that’s a whopping 13 mm in diameter and 5 mm in height. Because size matters, right?

And because we’re living in the future, this device is powered wirelessly. No more leashes for our furry friends; they can now frolic freely while getting their neurons zapped. The eight-channel stimulation electrode array is like a tiny skyscraper of tech, microfabricated on an LCP substrate and sealed with a kiss under a domed LCP lid using what must be a magical spot-welding process.

But wait, there’s more! This isn’t just a fancy paperweight. No, it’s been tested in the wild—well, in vivo with rats suffering from neuropathic pain. And would you believe it, the little critters showed an increase in their mechanical withdrawal threshold. In layman’s terms, they didn’t flinch as much when poked, thanks to the microelectrical stimulation from their fancy new headgear.

So, hats off to the boffins for making rats’ lives a little less painful and a lot more futuristic. Who knew that the key to progress was making everything so small that you almost need a magnifying glass to see it?