Format

Send to

Choose Destination
Small. 2018 Apr;14(16):e1703964. doi: 10.1002/smll.201703964. Epub 2018 Feb 26.

A Monolithic Force-Sensitive 3D Microgripper Fabricated on the Tip of an Optical Fiber Using 2-Photon Polymerization.

Author information

1
Hamlyn Centre for Robotic Surgery, Bessemer Building, Imperial College London, South Kensington, London, SW7 2AZ, UK.
2
Surgical Innovation Centre, Paterson Building, Department of Medicine, St. Mary's Hospital, Imperial College London, South Wharf Road, London, W2 1NY, UK.

Abstract

Microscale robotic devices have myriad potential applications including drug delivery, biosensing, cell manipulation, and microsurgery. In this work, a tethered, 3D, compliant grasper with an integrated force sensor is presented, the entirety of which is fabricated on the tip of an optical fiber in a single-step process using 2-photon polymerization. This gripper can prove useful for the interrogation of biological microstructures such as alveoli, villi, or even individual cells. The position of the passively actuated grasper is controlled via micromanipulation of the optical fiber, and the microrobotic device measures approximately 100 µm in length and breadth. The force estimation is achieved using optical interferometry: high-dimensional spectral readings are used to train artificial neural networks to predict the axial force exerted on/by the gripper. The design, characterization, and testing of the grasper are described and its real-time force-sensing capability with an accuracy below 2.7% of the maximum calibrated force is demonstrated.

KEYWORDS:

2-photon polymerization; compliant actuation; microgrippers; microrobots; optical force sensing

PMID:
29479810
DOI:
10.1002/smll.201703964
Free full text

Supplemental Content

Full text links

Icon for Wiley Icon for Spiral, Imperial College Digital Repository
Loading ...
Support Center