Researchers at Harvard University report a small robot arm that folds like origami and moves when exposed to a controlled magnetic field. The device has no battery and no wire. Power comes from an external coil that creates a magnetic field, which induces tiny electric currents inside the robot. Those currents heat special coils made of shape memory alloy, a metal that changes shape when heated, so the arm bends and a small gripper opens and closes with precise, repeatable motion.
Because it uses folding joints and external power, the arm can be built at very small sizes. This approach could support future tools for minimally invasive surgery, where smaller instruments help reduce tissue damage and speed recovery. It also fits lab tasks that need gentle micromanipulation, such as handling single cells or delicate tissues.
The work shows a path toward surgical tools that are lighter, simpler, and easier to scale down than robots that carry motors and batteries. Later prototypes from the same research ecosystem also demonstrated compact, teleoperated manipulators for delicate surgical tasks. However, these systems remain research platforms. Clinical use will require proven biocompatible materials, sterilization methods, reliable control inside the body, and regulatory approval.
The device is an origami-inspired robotic manipulator controlled by magnetic fields, not a humanlike robot.

Science Robotics – Addressable wireless actuation for multijoint folding robots and devices – 2017
The authors show how to power and control folding, multi joint origami devices without batteries by using resonant circuits and an external magnetic field. They demonstrate addressable control of joints and a small robotic arm with a gripper, indicating potential for miniature medical and industrial tools.
Wyss Institute at Harvard University – No battery, no wire, no problem – 2017
Institute news release explaining the battery free, magnetically powered origami robots. It details the use of shape memory alloy “muscles”, frequency selective control, and a proof of concept folding robot arm and gripper.
Wyss Institute at Harvard University – Cutting surgical robots down to size – 2020
Press release on a later miniature remote center of motion manipulator that improves precision in teleoperated surgical tasks. It highlights compact design inspired by origami mechanisms and its potential to make surgical robots smaller and more practical.
TechXplore – Miniaturized origami inspired robot combines micrometer precision with high speed – 2018
Research news on the milliDelta, a millimeter scale, high precision robot from the Harvard microrobotics group, relevant as a companion line of work for microsurgery and microassembly that shows how scaling down robotic mechanisms can increase speed and precision.
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