A Dexterous Tip-extending Robot with Variable-length Shape-locking

Soft, tip-extending "vine" robots offer a unique mode of inspection and manipulation in highly constrained environments. For practicality, it is desirable that the distal end of the robot can be manipulated freely, while the body remains stationary. However, in previous vine robots, either the shape of the body was fixed after growth with no ability to manipulate the distal end, or the whole body moved together with the tip. Here, we present a concept for shape-locking that enables a vine robot to move only its distal tip, while the body is locked in place. This is achieved using two inextensible, pressurized, tip-extending, chambers that "grow" along the sides of the robot body, preserving curvature in the section where they have been deployed. The length of the locked and free sections can be varied by controlling the extension and retraction of these chambers. We present models describing this shape-locking mechanism and workspace of the robot in both free and constrained environments. We experimentally validate these models, showing an increased dexterous workspace compared to previous vine robots. Our shape-locking concept allows improved performance for vine robots, advancing the field of soft robotics for inspection and manipulation in highly constrained environments.

[1]  Karim Abdel-Malek,et al.  Synthesis and analysis of a flexible elephant trunk robot , 2006, Adv. Robotics.

[2]  Jenny Dankelman,et al.  Polymer Rigidity Control for Endoscopic Shaft-Guide ‘Plastolock’ — A Feasibility Study , 2010 .

[3]  Allison M. Okamura,et al.  Helical actuation on a soft inflated robot body , 2018, 2018 IEEE International Conference on Soft Robotics (RoboSoft).

[4]  Joseph D. Greer,et al.  A Soft, Steerable Continuum Robot That Grows via Tip Extension. , 2019, Soft robotics.

[5]  S. M. Hadi Sadati,et al.  Stiffness Control of Soft Robotic Manipulator for Minimally Invasive Surgery (MIS) Using Scale Jamming , 2015, ICIRA.

[6]  Robert J. Webster,et al.  Concentric Tube Robots as Steerable Needles: Achieving Follow-the-Leader Deployment , 2015, IEEE Transactions on Robotics.

[7]  Allison M. Okamura,et al.  Series pneumatic artificial muscles (sPAMs) and application to a soft continuum robot , 2017, 2017 IEEE International Conference on Robotics and Automation (ICRA).

[8]  Mehran Armand,et al.  A continuum manipulator with phase changing alloy , 2016, 2016 IEEE International Conference on Robotics and Automation (ICRA).

[9]  Ian D. Walker,et al.  Continuous Backbone “Continuum” Robot Manipulators , 2013 .

[10]  Wenzeng Zhang,et al.  The Fluid-Skeleton Elastic Manipulator (FSEM): A novel solution for highly maneuverable robotic arms , 2016, 2016 IEEE International Conference on Robotics and Biomimetics (ROBIO).

[11]  Kaspar Althoefer,et al.  Shrinkable, stiffness-controllable soft manipulator based on a bio-inspired antagonistic actuation principle , 2014, 2014 IEEE/RSJ International Conference on Intelligent Robots and Systems.

[12]  A Menciassi,et al.  A bioinspired soft manipulator for minimally invasive surgery , 2015, Bioinspiration & biomimetics.

[13]  Wenzeng Zhang,et al.  ET Arm: Highly Compliant Elephant-Trunk Continuum Manipulator , 2014, ICIRA.

[14]  D. Rus,et al.  Design, fabrication and control of soft robots , 2015, Nature.

[15]  Allison M. Okamura,et al.  Dynamically Reconfigurable Discrete Distributed Stiffness for Inflated Beam Robots , 2020, 2020 IEEE International Conference on Robotics and Automation (ICRA).

[16]  Karl Iagnemma,et al.  A Novel Layer Jamming Mechanism With Tunable Stiffness Capability for Minimally Invasive Surgery , 2013, IEEE Transactions on Robotics.

[17]  Karl Iagnemma,et al.  Design and Analysis of a Robust, Low-cost, Highly Articulated manipulator enabled by jamming of granular media , 2012, 2012 IEEE International Conference on Robotics and Automation.

[18]  Allison M. Okamura,et al.  A soft robot that navigates its environment through growth , 2017, Science Robotics.

[19]  Daniel J. Inman,et al.  Engineering Mechanics: Statics , 1998 .

[20]  Allison M. Okamura,et al.  Vine Robots: Design, Teleoperation, and Deployment for Navigation and Exploration , 2019, IEEE Robotics & Automation Magazine.

[21]  Ian D. Walker,et al.  Kinematics for multisection continuum robots , 2006, IEEE Transactions on Robotics.

[22]  Tianmiao Wang,et al.  A novel soft manipulator based on beehive structure , 2015, 2015 IEEE/RSJ International Conference on Intelligent Robots and Systems (IROS).

[23]  Elliot W. Hawkes,et al.  Simple, Low-Hysteresis, Foldable, Fabric Pneumatic Artificial Muscle , 2020, IEEE Robotics and Automation Letters.

[24]  Paul E. Glick,et al.  Eversion and Retraction of a Soft Robot Towards the Exploration of Coral Reefs , 2019, 2019 2nd IEEE International Conference on Soft Robotics (RoboSoft).

[25]  Christopher C. Pagano,et al.  Continuum robot arms inspired by cephalopods , 2005, SPIE Defense + Commercial Sensing.

[26]  Allison M. Okamura,et al.  Obstacle-Aided Navigation of a Soft Growing Robot , 2018, 2018 IEEE International Conference on Robotics and Automation (ICRA).

[27]  W. F. Riley,et al.  Engineering Mechanics: Statics , 1993 .

[28]  Robert J. Webster,et al.  Design and Kinematic Modeling of Constant Curvature Continuum Robots: A Review , 2010, Int. J. Robotics Res..

[29]  B. Gartner.  Structural stability and architecture of vines vs. shrubs of poison oak, Toxicodendron diversilobum , 1991 .