Illuminant Surgical wants to give doctors x-ray vision.

Here is a strange fact about modern surgery: a surgeon operating on your spine spends a meaningful chunk of the procedure not looking at you. They are looking at a monitor mounted across the room, glancing back and forth between a glowing scan and the open field in front of them, doing the mental gymnastics of translating a flat, grayscale image into the three-dimensional body under their hands. It works. It has worked for decades. But it is, if you think about it, a slightly ridiculous way to do the most precise work a human being can do.

Illuminant Surgical's proposition is to delete the middleman. Instead of putting the imaging on a monitor and asking the surgeon to look away, put the imaging on the patient. The company's flagship system, Skylight, is essentially a smart surgical lamp: it takes a patient's medical imaging and projects the relevant anatomy directly onto their skin, aligned to their actual body, updating in real time. Co-founder and co-CEO Eldrick Millares describes it as displaying images on the skin "to tell you exactly what's underneath as you're cutting" - or, more vividly, as "a live tattoo that moves with the patient."

That phrase - a live tattoo - is worth sitting with, because it quietly names the genuinely hard part. Projecting an image onto a flat wall is a solved problem; any conference room can do it. Projecting an image onto a curved, breathing, occasionally bleeding human body, and keeping that image locked precisely to the anatomy beneath the surface as the body shifts, is not. That is a computer-vision problem, a depth-mapping problem, and a registration problem all at once. Skylight's answer comes in two named pieces, which we'll get to. The point for now is that the elegant idea - just put the picture on the patient - hides a stack of difficult engineering, and the difficult engineering is the moat.

Illuminant Surgical was founded in 2021 by Eldrick Millares and Dr. James Hu, who met as classmates at Stanford and now run the company as co-CEOs - one leaning engineering, one leaning medicine. That pairing matters in medical devices, where the failure mode is usually a beautiful piece of technology that no clinician can actually fit into a real operating room, or a clinically sound idea that no one can actually build.

The company's most quietly clever decision was geographic. It planted itself in Los Angeles - Culver City, specifically - not because LA is a traditional medtech hub, but because it is the world capital of a very specific and very relevant skill: projection. The people who make images dance across live performers, stadium floors and theme-park rides are exactly the people you want if your product is real-time projection mapping onto a moving body. One engineer on staff previously built projection technology for performers in the Disney Imagineering tradition; that same craft, pointed at a spine instead of a stage, becomes surgical navigation. The lesson is a good one for any founder: the hard technical problem in your field may already be solved cold in an industry that looks nothing like yours.

Hu is candid about where he thinks this all goes. "I think open surgeries are going to become more and more of a rare procedure, limited to extremely complex cases," he has said. The mechanism behind that claim is straightforward enough to be credible: better guidance makes small incisions safer, and safer small incisions make big ones unnecessary. Skylight starts with the spine, but the roadmap runs toward lung cancer biopsies and other percutaneous, image-guided access - anywhere a doctor needs to hit a target under the skin without a large opening to see it.