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قديم 05-25-2020, 06:12 AM
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افتراضي Magnetic Tracking System for Flexible Surgical Robots

Magnetic Tracking System for Flexible Surgical Robots
Researchers at the University of California San Diego have developed a magnetic tracking system for surgical robots to operate with dexterity within the body. The technology does not require patient or clinician exposure to radiation, and is much less expensive that pre-existing monitoring techniques. A magnet is embedded in the tip of the robot and a series of sensors can track its location, while a neural network improves the accuracy of the tracking system.

“Continuummedical robots work really well in highly constrained environments inside thebody,” said Tania Morimoto, a researcher involved in the study. “They’reinherently safer and more compliant than rigid tools. But it becomes a lotharder to track their location and their shape inside the body. And so if weare able track them more easily that would be a great benefit both to patientsand surgeons.”

Current techniques to track such robots can involve X-ray exposure for medical staff and patients, and can be expensive. This new approach developed by Morimoto and her colleagues is much less expensive, clocking in at approximately $100 for the required components, and does not require radiation. The system relies on the magnetic field produced by a magnet embedded in the tip of a flexible surgical robot.

Four sensors can detect this magnetic field when they are placed at specific locations near where the robot is operating, and a computer model then predicts the location of the robot based on this sensor data. The computer system development involved using a neural network to determine the difference between the actual and theoretical sensor values, which helped the researchers to improve the accuracy of their system.

So far, theresearch team has tested the system using a specific type of soft robot thatcan navigate delicate areas in the body as it is flexible and applies verylittle pressure to the structures it encounters. “We worked with a growingrobot, which is a robot made of a very thin nylon that we invert, almost like asock, and pressurize with a fluid which causes the robot to grow,” said ConnorWatson, another researcher involved in the project. “Because the robot is softand moves by growing, it has very little impact on its surroundings, making itideal for use in medical settings.”

See a video about the technology below:


Study in IEEE Robotics and Automation Letters: Permanent Magnet-BasedLocalization for Growing Robots in Medical Applications

Via: University ofCalifornia San Diego


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