The use of a structure with a remote fixed point around which a mechanism can rotate is called remote centre of motion (RCM). The technique is widely used in minimally invasive surgery to avoid excess force on the incision site during the robot’s motion. Here we describe the design, fabrication and characterization of an origami-inspired miniature RCM manipulator for teleoperated microsurgery (the mini-RCM has mass 2.4 g and size 50 mm × 70 mm × 50 mm), which is actuated by three independently controlled linear actuators with concomitant sensing (each mini-LA has mass 0.41 g and size 28 mm × 7 mm × 3.6 mm). The mini-RCM has a payload capacity of approximately 27 mN and attains a positional precision of 26.4 μm. We demonstrate its potential utility as a precise tool for teleoperated microsurgery by performing 0.5-mm-square tracing and micro-cannulation teleoperated microsurgical procedures under a microscope. Teleoperation using the mini-RCM reduced the deviation from the desired trajectory by 68% compared to manual operation. In addition, the mini-RCM allows gravity compensation and back drivability for safety. Its compact, simple structure facilitates manufacture.
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The source data for the figures presented in this paper can be found in the Supplementary information. Source data are provided with this paper.
Motion control code is available from the corresponding authors upon reasonable request.
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We acknowledge the advice and discussions about fabrication techniques from G. Freeburn, P. York, D. Lee and all members of the Harvard Microrobotics Laboratory for their help and assistance.
The authors declare no competing interests.
Publisher’s note Springer Nature remains neutral with regard to jurisdictional claims in published maps and institutional affiliations.
a, The rail-unit. b, The runner-unit.
The signal from the function generator can be modified through the multiplier IC according to the output signal from the D/A. We can adjust the speed and motion direction of the runner-unit using the output signal of the D/A. The signal, generated by a proportional controller, is amplified and transmitted to the mini-LA. The displacement is measured and sampled by the mini-LA and a reference laser displacement sensor simultaneously.
Experimental determination of the mini-RCM’s motion range.
Supplementary Tables 1–5
Pop-up book assembly
Fail-safe Power outage
Source files of the collected data (.m .csv files).
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Suzuki, H., Wood, R.J. Origami-inspired miniature manipulator for teleoperated microsurgery. Nat Mach Intell 2, 437–446 (2020). https://doi.org/10.1038/s42256-020-0203-4
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