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Monday, February 26, 2024
Feb. 26, 2024

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Engineers build robot to perform surgery sans doctor

STAR would be used to perform sutures in patients

2 Photos
A team of mechanical engineers from Johns Hopkins University are developing a SMART robot (Smart Tissue Autonomous Robot) that can perform soft tissue surgeries. This is a detail of the robot's suturing arm working on simulated blood vessels.
A team of mechanical engineers from Johns Hopkins University are developing a SMART robot (Smart Tissue Autonomous Robot) that can perform soft tissue surgeries. This is a detail of the robot's suturing arm working on simulated blood vessels. (Barbara Haddock Taylor/Baltimore Sun/TNS) (Barbara Haddock Taylor/Baltimore Sun) Photo Gallery

BALTIMORE — In a high-tech lab on Johns Hopkins University’s Homewood campus in Baltimore, engineers have been building a robot that may be able to stitch back together the broken vessels in your belly and at some point maybe your brain, no doctor needed.

The robot has a high-tech camera on one arm and a high-tech sewing machine on a second arm. It’s already reattached halves of a pig’s intestines.

“It’s like park-assist in a car,” said Axel Krieger, an assistant professor of mechanical engineering in Hopkins’ Whiting School of Engineering. “Performs the procedure autonomously.”

This kind of suturing is performed more than a million times a year in surgeries around the country, said Krieger, part of a team developing the robot and senior author on a recent paper describing the technology in Science Robotics.

The goal is to develop in the next several years a robot that makes the intricate and delicate work of suturing more consistent. Missing a stitch or doing one awkwardly could cause a catastrophic complication for a patient. The robotic procedure is also less invasive as it’s performed laparoscopically, through small holes in the skin rather than a large opening.

The Hopkins engineers expect the robot to be cheaper than existing robotic technology and more portable. They want to develop a mobile version that eventually could be used on an ambulance or in the field for emergencies, such as stitching up a major artery to stop bleeding.

The robot would advance technology currently in wide use in operating rooms. The U.S. Food and Drug Administration calls them robotically assisted surgical devices.

The best known is the da Vinci robot federally approved for general laparoscopic surgical use in 2000. The device has a console where a surgeon can see a 3D image and move several arms with surgical instruments, essentially becoming an extension of the doctor.

“The device is not actually a robot because it cannot perform surgery without direct human control,” the FDA says.

The da Vinci robot is now commonly used in gallbladder removal, hysterectomies and prostate removals because it works best on “complex tasks in confined areas,” according to the FDA.

Other robotic machines assisted in surgery before da Vinci was developed but required far larger incisions.

The new robot being developed by Hopkins engineers along with collaborators at the Children’s National Hospital in Washington, D.C., known as Smart Tissue Autonomous Robot, or STAR, is different. It does have computer monitors that offer a 3D view, but it doesn’t have a joystick or other controls.

The STAR is run by a highly advanced, and adaptable-on-the-fly computer program. The algorithm “sees” and “feels” through cameras that create 3D images with lasers and sensors that detect pressure from breathing, bleeding and soft tissue.

The robot completes about a stitch a minute, a conservative pace slightly slower than a human surgeon. The tests so far have shown more consistency than the humans.

That’s been an issue with robotic technology now in the operating rooms. The current robotic-assisted technology is better at some surgical tasks than others. And outcomes aren’t always an improvement even if things appear to go smoothly.

Such machines also add significantly to the expense of surgery because the cost of the equipment reaches into the millions, though some of that can be made up through shorter hospital stays and fewer complications. But many smaller hospitals and those in less affluent regions or other countries can’t afford upfront expenditure.

Jin Kang, another STAR developer and a professor in the Hopkins department of electrical and computer engineering, said the STAR requires less machinery and would be cheaper, though the ultimate cost is not determined.

It was designed with input from surgeons, who often choose to use technology because it can help them withstand the rigors of their job. Long hours of traditional surgery can cause human hands to twitch and fatigue.

He said surgeons and other surgical staff still would perform procedures, such as removing diseased tissue, before handing off to STAR, and would stay in the room in case of an emergency as the robot reconnected intestines or other vessels.

“Doctors are not being replaced,” Kang said.

Dr. Michael Awad, the director of the Barnes-Jewish Hospital Comprehensive Robotics Program in St. Louis, was not involved in STAR’s development but has been following the work at Hopkins. He did his surgical residency at Johns Hopkins Hospital and trained on the first generation of da Vinci robot there.

Awad said it’s still early in the process, but he believes autonomous robots are inevitable in the operating room and the Hopkins researchers work could be a big step forward.

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