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His Neuralink company is creating implantable brain–computer interfaces, but it isn't the only one.

“A virtual model of our hearts is still closer to a human heart than that of a dog, cow, sheep, or pig, which tends to be what they use for implantable device studies,” she says.

It's a computer-generated heart, or digital twin, used to test implantable cardiovascular devices, like stents, and prosthetic valves that, once confirmed they are safe, will eventually be used on real people.

Northwestern University scientists have designed a new implantable device that can monitor fluctuating levels of proteins within the body in real time.

The researchers built an implantable microdevice with the electrode and sensors inside a thin microneedle, the width of just three human hairs.