Deep within the body, the small intestine has long resisted the reach of human instruments: some twenty feet of tightly folded, slippery tissue that doctors can examine only with difficult, time-consuming tools. Here, researchers from UT Southwestern and MIT have offered a quiet alternative, a soft robot that takes its cues from snakes and from the folded art of paper, and that moved through preclinical intestine with its camera, biopsy tool, and fluid channel intact. It is an early step, not yet a promise for patients, but it reflects a patient human impulse to make the hidden parts of the bo
Snake-Inspired Soft Robot Navigates Small Intestine in Preclinical Tests, Offering Gentler Alternative to Enteroscopy
Six feet of small intestine in about 11 minutes, with no visible tissue damage
Mark
Why does it matter that this thing moves like a snake?
Mimi
Because the small intestine is about 20 feet of slippery, folded tube. The robot stretches and bends with air-filled chambers, and bristly kirigami sleeves grip the lining without stretching it much.
Mark
And the current method?
Mimi
Double-balloon enteroscopy. It works, but it's hard to operate, takes extensive training, and is slow, so few patients get examined each day.
Luke
Let's be clear about the evidence, though. Six feet in about 11 minutes is one preclinical trial. That's well short of the full 20 feet.
Mimi
Right. Ying himself says longer-distance performance still needs evaluating.
Luke
And "no visible tissue damage" is an observation, not a safety study.
Mimi
Fair. Safety is on his own list of things to validate before human testing.
Mark
What about the autonomous navigation idea?
Luke
That's a belief of Ying's about the future. The lab is using AI to optimize the design, but nothing in the reporting shows autonomy has been demonstrated.
Mimi
Today a person steers it with a joystick. That's the confirmed part.
Mark
So what's the next real test?
Mimi
Direct comparison with double-balloon enteroscopy, and eventually clinically relevant settings. No human trial has been announced.
The Pulse
- The small intestine is nearly twenty feet of folded, slippery tissue, and current double-balloon enteroscopes are hard to operate and demand rare expertise.
- Only a handful of patients can be examined each day, leaving people with bleeding, Crohn's disease, and tumors waiting on a procedure few clinicians can perform.
- A snake-inspired robot with Kevlar-reinforced air chambers and kirigami sleeves grips the gut wall and inches forward with minimal distention.
- In a preclinical trial on real small intestine, BIOSENTER covered six feet in about eleven minutes with no visible tissue damage.
- No human testing is scheduled; longer-distance, safety, usability, and head-to-head comparison studies must come first.
Deep within the body, the small intestine has long resisted the reach of human instruments: some twenty feet of tightly folded, slippery tissue that doctors can examine only with difficult, time-consuming tools. Here, researchers from UT Southwestern and MIT have offered a quiet alternative, a soft robot that takes its cues from snakes and from the folded art of paper, and that moved through preclinical intestine with its camera, biopsy tool, and fluid channel intact. It is an early step, not yet a promise for patients, but it reflects a patient human impulse to make the hidden parts of the body easier to know and to heal.
The device is a hollow cylinder a little over three and a half inches long, and in a preclinical trial it crawled through six feet of small intestine in about eleven minutes. Along the way it carried a camera, a biopsy tool, and a fluid delivery system. When the researchers examined the tissue afterward, they found no visible damage.
The robot, called BIOSENTER, was developed in part by Binbin Ying at UT Southwestern, with Giovanni Traverso and colleagues at MIT. The work appeared in Science Robotics. It grew out of a problem of anatomy: the small intestine is about twenty feet long, tightly folded, and lined with slippery mucosa. Double-balloon enteroscopes can reach it, but they are difficult to run, require long training, and carry risks, so few physicians can use them and only a few patients can be examined each day.
Ying began the idea during his postdoctoral years at MIT and Brigham and Women's Hospital, and he carried it with him to UT Southwestern in 2025. The design borrows from snake skin and from kirigami. Pumped air fills Kevlar-reinforced chambers that lengthen and bend the body, while polyimide kirigami sleeves at the head and tail grip the mucosa and push the device forward without the heavy balloon inflation that conventional tools need. A central channel carries the instruments, and an operator steers with a joystick. Early tests used transparent pipes shaped like the intestine's turns; the latest run used real tissue.
Ying is careful about what remains. His lab is using artificial intelligence to refine the kirigami structure, and he imagines someday autonomous navigation. He says the device still needs longer-distance, safety, and usability work, along with direct comparison to double-balloon methods. No human trial is planned yet, but the hope is to see whether it could one day complement the procedures patients already rely on.
The device at the center of this story is a hollow cylinder a little over 3.5 inches long. In preclinical testing, it crawled through 6 feet of small intestine in about 11 minutes, with a camera, a biopsy tool, and a fluid delivery system working along the way. When the researchers looked afterward, they saw no visible damage to the tissue.
The robot is called BIOSENTER, short for bioinspired soft enteroscopic robot. It was developed in part by Binbin Ying, Ph.D., an assistant professor of biomedical engineering and internal medicine in the Division of Digestive and Liver Diseases at UT Southwestern Medical Center. The findings appeared in Science Robotics. Giovanni Traverso, M.D., Ph.D., a professor of mechanical engineering at MIT and a gastroenterologist at Brigham and Women's Hospital, is the study's corresponding author, and several other MIT collaborators joined the work.
The problem it addresses is one of anatomy. The small intestine is about 20 feet long, tightly folded, and lined with slippery mucosa, which makes it among the hardest organs to reach. Doctors now examine it with double-balloon enteroscopes. Ying says the devices work, but they are difficult to operate, demand extensive training, and carry potential risks. Few physicians are trained to use them, and because the procedures take so long, only a few patients can be examined each day. A better tool could matter for people with gastrointestinal bleeding, Crohn's disease and other forms of inflammatory bowel disease, and tumors.
Ying began working on the idea during his postdoctoral training at MIT and Brigham and Women's Hospital, where he set out to improve enteroscope design. He brought the robot with him when he joined UT Southwestern in 2025, and he and colleagues in the Ying Lab have kept refining it.
The design borrows from two sources: the scaly skin of snakes and kirigami, the Japanese art of cutting and folding paper into three-dimensional shapes. Inside the body, Kevlar-reinforced inflatable chambers are filled with pumped air, which lengthens and bends the robot in a way similar to snake musculature. Kirigami sleeves made of polyimide form the head and tail. When air expands them, their bristly surfaces grip the mucosa and keep distention low while pushing the robot forward. In testing, the design produced enough anchoring force to propel the device without the extensive expansion that conventional balloons require. A central channel carries the tools for imaging, biopsy, and delivery of therapeutic agents, and operators steer with a joystick.
The team first tried BIOSENTER in transparent PVC pipes arranged to mimic the intestine's twists and turns. The 6-foot, 11-minute run came in the latest preclinical trial, which used actual small intestine.
The work is still early. Ying's lab is using artificial intelligence to optimize the kirigami structure and improve locomotion, and he believes enteroscopes built on this technology might one day navigate a patient's intestines autonomously. If the robot's capabilities can be folded into existing tools, he says, training barriers could fall and more patients could get small intestine exams and procedures. "While this remains early-stage, preclinical technology, we're encouraged by its ability to navigate challenging intestinal anatomy," Ying said.
He was candid about what remains. Before any human testing, he said, the device needs further engineering and validation, including performance over longer distances, safety, usability, and direct comparison with current double-balloon enteroscopy. No human trial is planned yet. If the technology matures, the hope is to test it in clinically relevant settings and see how it could complement existing endoscopic procedures.
Funding came from several sources, including the MIT Karl van Tassel (1925) Career Development Professorship, the MIT Department of Mechanical Engineering, the UT Southwestern Startup Fund, the Government of Canada Banting Postdoctoral Fellowship, and the MIT Samsung Semiconductor Fellowship, among others.
Notable Quotes
Further engineering development and validation will be needed before human testing, including longer distances, safety, usability, and direct comparison with double-balloon enteroscopy.— Binbin Ying, Ph.D., UT Southwestern Medical Center
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