Distal end force sensing with optical fiber Bragg gratings for tendon-sheath mechanisms in flexible endoscopic robots

Accurate haptic feedback is a critical challenge for surgical robots, especially for flexible endoscopic surgical robots whose transmission systems are Tendon-Sheath Mechanisms (TSMs) with highly nonlinear friction profiles and force hysteresis. For distal end haptic sensing of TSMs, this paper, for...

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Main Authors: Lai, Wenjie, Cao, Lin, Xu, Zhilin, Phan, Phuoc Thien, Shum, Ping, Phee, Soo Jay
Other Authors: School of Electrical and Electronic Engineering
Format: Conference or Workshop Item
Language:English
Published: 2020
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Online Access:https://hdl.handle.net/10356/137867
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Institution: Nanyang Technological University
Language: English
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spelling sg-ntu-dr.10356-1378672023-03-04T17:07:11Z Distal end force sensing with optical fiber Bragg gratings for tendon-sheath mechanisms in flexible endoscopic robots Lai, Wenjie Cao, Lin Xu, Zhilin Phan, Phuoc Thien Shum, Ping Phee, Soo Jay School of Electrical and Electronic Engineering School of Mechanical and Aerospace Engineering 2018 IEEE International Conference on Robotics and Automation (ICRA) Center for Optical Fiber Technology Robotics Research Centre Engineering::Mechanical engineering::Robots Haptic Sensing Fiber Bragg Gratings Accurate haptic feedback is a critical challenge for surgical robots, especially for flexible endoscopic surgical robots whose transmission systems are Tendon-Sheath Mechanisms (TSMs) with highly nonlinear friction profiles and force hysteresis. For distal end haptic sensing of TSMs, this paper, for the first time, proposes to measure the compression force on the sheath at the distal end so that the tension force on the tendon, which equals the compression force on the sheath, can be obtained. A new force sensor, i.e., a nitinol tube attached with an optical Fiber Bragg Grating (FBG) fiber, is proposed to measure the compression force on the sheath. This sensor, with similar diameter and configuration (hollow) as the sheath, can be compactly integrated with TSMs and surgical end-effectors. In this paper, mechanics analysis and verification tests are presented to reveal the relationship between the tension force on the tendon and the compression force on the sheath. The proposed force sensor was calibrated in tests with a sensitivity of 24.28 pm/N and integrated with a tendon-sheath driven grasper to demonstrate the effectiveness of the proposed approach and sensor. The proposed approach and sensor can also be applied for a variety of TSMs-driven systems, such as robotic fingers/hands, wearable devices, and rehabilitation devices. NRF (Natl Research Foundation, S’pore) Accepted version 2020-04-17T01:33:56Z 2020-04-17T01:33:56Z 2018 Conference Paper Lai, W., Cao, L., Xu, Z., Phan, P. T., Shum, P., & Phee, S. J. (2018). Distal end force sensing with optical fiber Bragg gratings for tendon-sheath mechanisms in flexible endoscopic robots. Proceedings of 2018 IEEE International Conference on Robotics and Automation (ICRA), 5349-5355. doi:10.1109/ICRA.2018.8461090 9781538630815 https://hdl.handle.net/10356/137867 10.1109/ICRA.2018.8461090 2-s2.0-85059598019 5349 5355 en © 2018 IEEE. Personal use of this material is permitted. Permission from IEEE must be obtained for all other uses, in any current or future media, including reprinting/republishing this material for advertising or promotional purposes, creating new collective works, for resale or redistribution to servers or lists, or reuse of any copyrighted component of this work in other works. The published version is available at: https://doi.org/10.1109/ICRA.2018.8461090 application/pdf
institution Nanyang Technological University
building NTU Library
continent Asia
country Singapore
Singapore
content_provider NTU Library
collection DR-NTU
language English
topic Engineering::Mechanical engineering::Robots
Haptic Sensing
Fiber Bragg Gratings
spellingShingle Engineering::Mechanical engineering::Robots
Haptic Sensing
Fiber Bragg Gratings
Lai, Wenjie
Cao, Lin
Xu, Zhilin
Phan, Phuoc Thien
Shum, Ping
Phee, Soo Jay
Distal end force sensing with optical fiber Bragg gratings for tendon-sheath mechanisms in flexible endoscopic robots
description Accurate haptic feedback is a critical challenge for surgical robots, especially for flexible endoscopic surgical robots whose transmission systems are Tendon-Sheath Mechanisms (TSMs) with highly nonlinear friction profiles and force hysteresis. For distal end haptic sensing of TSMs, this paper, for the first time, proposes to measure the compression force on the sheath at the distal end so that the tension force on the tendon, which equals the compression force on the sheath, can be obtained. A new force sensor, i.e., a nitinol tube attached with an optical Fiber Bragg Grating (FBG) fiber, is proposed to measure the compression force on the sheath. This sensor, with similar diameter and configuration (hollow) as the sheath, can be compactly integrated with TSMs and surgical end-effectors. In this paper, mechanics analysis and verification tests are presented to reveal the relationship between the tension force on the tendon and the compression force on the sheath. The proposed force sensor was calibrated in tests with a sensitivity of 24.28 pm/N and integrated with a tendon-sheath driven grasper to demonstrate the effectiveness of the proposed approach and sensor. The proposed approach and sensor can also be applied for a variety of TSMs-driven systems, such as robotic fingers/hands, wearable devices, and rehabilitation devices.
author2 School of Electrical and Electronic Engineering
author_facet School of Electrical and Electronic Engineering
Lai, Wenjie
Cao, Lin
Xu, Zhilin
Phan, Phuoc Thien
Shum, Ping
Phee, Soo Jay
format Conference or Workshop Item
author Lai, Wenjie
Cao, Lin
Xu, Zhilin
Phan, Phuoc Thien
Shum, Ping
Phee, Soo Jay
author_sort Lai, Wenjie
title Distal end force sensing with optical fiber Bragg gratings for tendon-sheath mechanisms in flexible endoscopic robots
title_short Distal end force sensing with optical fiber Bragg gratings for tendon-sheath mechanisms in flexible endoscopic robots
title_full Distal end force sensing with optical fiber Bragg gratings for tendon-sheath mechanisms in flexible endoscopic robots
title_fullStr Distal end force sensing with optical fiber Bragg gratings for tendon-sheath mechanisms in flexible endoscopic robots
title_full_unstemmed Distal end force sensing with optical fiber Bragg gratings for tendon-sheath mechanisms in flexible endoscopic robots
title_sort distal end force sensing with optical fiber bragg gratings for tendon-sheath mechanisms in flexible endoscopic robots
publishDate 2020
url https://hdl.handle.net/10356/137867
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