Technical Brief

Design and Development of a Wheel Chair Based Manual Self-Transfer Device for Elderly and Disabled

[+] Author and Article Information
R. Hari Krishnan

School of Mechanical Engineering,
SASTRA University,
Thanjavur, Tamil Nadu 613401, India
e-mail: harikrishnan@mech.sastra.edu

S. Pugazhenthi

School of Mechanical Engineering,
SASTRA University,
Thanjavur, Tamil Nadu 613401, India
e-mail: pugazhenthi@mech.sastra.edu

1Corresponding author.

Manuscript received May 19, 2015; final manuscript received February 15, 2016; published online May 12, 2016. Assoc. Editor: Carl Nelson.

J. Med. Devices 10(2), 024501 (May 12, 2016) (5 pages) Paper No: MED-15-1187; doi: 10.1115/1.4032867 History: Received May 19, 2015; Revised February 15, 2016

A novel and frugal self-transfer device has been developed for transferring a user, with disabilities in lower limbs, from a wheel chair to a toilet commode or any other surface. The device does not require any external power for the transfer operation, as it utilizes the available physical strength of the upper body of the user. It is designed to raise the user, turn, and place on top of a toilet seat. Lockable gas springs are employed for raising, while a turntable with epicyclic gear train facilitates rotary transfer. Trials were carried out to optimize the ergonomic aspects of the design. Overall acceptability of the system has also been studied, and the results show that the device is capable of transferring a subject from a wheel chair to another surface with less effort.

Copyright © 2016 by ASME
Topics: Design , Wheels
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Fig. 1

Conceptual design of manual self-transfer device showing stages of transfer motion

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Fig. 2

CAD model of manual self-transfer device attached to a wheel chair

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Fig. 3

Side view (a) and front view (b) of the manual self-transfer device

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Fig. 4

Process of transfer of a person from wheel chair to a stool

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Fig. 5

Various parameters under consideration: (a) wheel chair–transfer device distance, (b) handle location, (c) handle height, (d) optimal design configuration (all dimensions are in millimeter)

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Fig. 6

Comfort-convenient scores during each condition

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Fig. 7

Comfort levels during different motions of transfer



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