Touchscreen-friendly fingertip system for tactile feedback in prosthetic hands
department or school: Applied Science, Faculty of
department or school: Biomedical Engineering, School of
data provider: DSpace
degree campus: UBCV
creator: Dupont, Bertille
issued: 2021-08-31T07:00:00Z
issued: 2020
related degree: Master of Applied Science - MASc
degree grantor: University of British Columbia
description: Today’s prostheses provide numerous intuitive features including several gripping patterns and movements guided by the user’s intentions. Nevertheless, users remain quite dependent on visual and auditory cues when trying to adjust grip forces, and are still unable to use their touchscreens with prosthetic fingertips. To approach this problem, researchers have proven that sensory feedback can help amputees to be faster and more accurate when accomplishing a task. However, there is still a need for a low-cost and adaptable sensory feedback add-on, requiring minimal modifications to the hand. This thesis presents the development of a low-cost sensory feedback system, including a stimulation device and a force sensing fingertip that comprises a capacitive sensor. The novelty of this research is the ability of the fingertip to activate touchscreens, and the full fingertip integration to the prosthetic hand, under the prosthetic glove – easy for the user to maintain. The glove integrated sensor capacitively detects forces over an area of 0.64 cm2. This detection is linear up to 1.6 N, with a resolution of 0.01 N. The second part of this thesis presents the implementation of shear detection, in addition to touch and pressure, using a modified sensor on a flexible printed circuit board. Able to detect touch, pressure, and shear simultaneously, the sensitive fingertip can send sensory feedback to the user. The last part of this thesis presents the implementation of two sensory feedback: one using an armband including a servo motor pushing on the user’s stump (mechanotactile feedback), and one using vibration motors hidden in the socket (vibrotactile feedback) – two feedbacks that are preferred based on a survey that we conducted. It was found that vibrotactile feedback would be more efficient due to its complete integration to the hand and its ability to send shear feedback. The next steps are the implementation of Bluetooth connections for wireless stimulation and the devel…
aggregated CHO: https://circle.library.ubc.ca/rest/handle/2429/75772
note: TOUCHSCREEN-FRIENDLY FINGERTIP SYSTEM FOR TACTILE FEEDBACK IN PROSTHETIC HANDS by Bertille Dupont B.Sc., University of Nevada, Reno, 2018 A THESIS SUBMITTED IN PARTIAL FULFILLMENT OF THE REQUIREMENTS FOR THE DEGREE OF MASTER OF APPLIED SCIENCE in THE FACULTY OF GRADUATE AND POSTDOCTORAL STUDIES (Biomedical Engineering) THE UNIVERSITY OF BRITISH COLUMBIA (Vancouver) August 2020 © Bertille Dupont, 2020 ii The following individuals certify that they have read, and recommend to the Faculty of Graduate and Postdoctoral Studies for acceptance, the thesis entitled: Touchscreen-friendly fingertip system for tactile feedback in prosthetic hands submitted by Bertille Dupont in partial fulfillment of the requirements for the degree of Master of Applied Science in Biomedical Engineering Examining Committee: John D. W. Madden, Electrical and Computer Engineering Supervisor Hendrik F. M. Van der Loos, Mechanical Engineering Supervisory Committee Member Karon MacLean, Computer Science Supervisory Committee Member iii Abstract Today’s prostheses provide numerous intuitive features including several gripping patterns and movements guided by the user’s intentions. Nevertheless, users remain quite dependent on visual and auditory cues when trying to adjust grip forces, and are still unable to use their touchscreens with prosthetic fingertips. To approach this problem, researchers have proven that sensory feedback can help amputees to be faster and more accurate when accomplishing a task. However, there is still a need for a low-cost and adaptable sensory feedback add-on, requiring minimal modifications to the hand. This thesis presents the development of a low-cost sensory feedback system, including a stimulation device and a force sensing fingertip that comprises a capacitive sensor. The novelty of this research is the ability of the fingertip to activate touchscreens, and the full fingertip integration to the prosthetic hand, under the prosthetic glove – easy for the user to maintai…
has type: Thesis/Dissertation
date issued: 2020-11
is shown at: 10.14288/1.0394086
language: eng
degree discipline: Biomedical Engineering
provider: Vancouver : University of British Columbia Library
publisher: University of British Columbia
rights: Attribution-NonCommercial-NoDerivatives 4.0 International
rights URI: http://creativecommons.org/licenses/by-nc-nd/4.0/
scholar level: Graduate
type: Text
identifier URI: http://hdl.handle.net/2429/75772