Special Section Technical Briefs

Pneumatic Sleeve Orthosis for Lofstrand Crutches: Application of Soft Pneumatic FREE Actuator1

[+] Author and Article Information
Chenzhang Xiao, Ye L. Oo, Deen Farooq, Elizabeth T. Hsiao-Wecksler

Department of Mechanical Science and Engineering,
University of Illinois at Urbana-Champaign,
Champaign, IL 61820

Gaurav Singh, Girish Krishnan

Department of Industrial and Enterprise
Systems Engineering,
University of Illinois at Urbana-Champaign,
Champaign, IL 61820

DOI: 10.1115/1.4033249Manuscript received March 1, 2016; final manuscript received March 17, 2016; published online May 12, 2016. Assoc. Editor: William Durfee.

J. Med. Devices 10(2), 020959 (May 12, 2016) (2 pages) Paper No: MED-16-1177; doi: 10.1115/1.4033249 History: Received March 01, 2016; Revised March 17, 2016

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Slavens, B. A. , Frantz, J. , Sturm, P. F. , and Harris, G. F. , 2009, “ Upper Extremity Dynamics During Lofstrand Crutch-Assisted Gait in Children With Myelomeningocele,” Gait Posture, 30(4), pp. 511–517. [CrossRef] [PubMed]
Kaye, H. S. , Kang, T. , and LaPlante, M. P. , 2000, “ Mobility Device Use in the United States,” National Institute on Disability and Rehabilitation Research, U.S. Department of Education, Washington, DC, Disability Statistics Report No. 14.
Krishnan, G. , Bishop-Moser, J. , Kim, C. , and Kota, S. , 2015, “ Kinematics of a Generalized Class of Pneumatic Artificial Muscles,” ASME J. Mech. Rob., 7(4), p. 041014. [CrossRef]
Campion, E. E. , Hoffmann, D. C. , and Jepson, R. P. , 1971, “ The Effect of External Pneumatic Splint Pressure on Muscle Blood Flow,” Aust. N. Z. J. Surg., 41(2), pp. 154–157. [CrossRef]


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Fig. 4

(a) Overview of piston pump in tip of crutch. (b) Cross section view and air flow (into the accumulator) during pumping.

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Fig. 5

Reaction force per unit length versus actuation pressure in FREE actuator

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Fig. 3

Experimental setup with 3D-printed shells, FREE actuator, air bladder, and pressure meter

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Fig. 2

Model of pneumatic sleeve under (a) no pressure, and (b) actuation pressure of 30 psig

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Fig. 1

(a) and (b) Prototype of pneumatic sleeve. (c) Demonstration of pneumatic sleeve not limiting forearm movement.



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