New results in feedback control of unsupported standing in paraplegia

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Gollee, H. ; Hunt, K.J. ; Wood, D.E. (2004)
  • Publisher: IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
  • Subject: R1

The aim of this study was to implement a new approach to feedback control of unsupported standing and to evaluate it in tests with an intact and a paraplegic subject. In our setup, all joints above the ankles are braced and stabilizing torque at the ankle is generated by electrical stimulation of the plantarflexor muscles. A previous study showed that short periods of unsupported standing with a paraplegic subject could be achieved. In order to improve consistency and reliability and to prolong the duration of standing, we have implemented several modifications to the control strategy. These include a simplified control structure and a different controller design method. While the reliability of standing is mainly limited by the muscle characteristics such as reduced strength and progressive fatigue, the results presented here show that the new strategy allows much longer periods (up to several minutes) of unsupported standing in paraplegia.
  • References (27)
    27 references, page 1 of 3

    [1] A. R. Kralj and T. Bajd, Functional Electrical Stimulation: Standing and Walking After Spinal Cord Injury. Boca Raton, FL: CRC, 1989.

    [2] L. A. Benton, L. L. Baker, B. R. Bowman, and R. L. Waters, “Functional electrical stimulation-A practical clinical guide,” Rancho Los Amigos Rehab. Eng. Center, Downey, CA, 1981.

    [3] N. Donaldson and C.-H. Yu, “A strategy used by paraplegics to stand up using FES,” IEEE Trans. Rehab. Eng., vol. 6, pp. 162-167, June 1998.

    [4] , “FES standing: Control by handle reactions of leg muscle stimulation (CHRELMS),” IEEE Trans. Rehab. Eng., vol. 4, pp. 280-284, Dec. 1996.

    [5] K. J. Hunt, M. Munih, and N. Donaldson, “Feedback control of unsupported standing in paraplegia. Part I: Optimal control approach. Part II: Experimental results,” Trans. IEEE Rehab. Eng., vol. 5, pp. 331-352, Dec. 1997.

    [6] D. E. Wood, V. Harper, F. M. D. Barr, P. N. Taylor, G. F. Phillips, and D. J. Erwins, “Experience in using knee angles as part of a closed loop algorithm to control FES assisted paraplegic standing,” in Proc. 6th Int. Workshop FES, Vienna, Austria, Sept. 1998, pp. 137-140.

    [7] D. Graupe and K. H. Kohn, Functional Electrical Stimulation for Ambulation by Paraplegics: Twelve Years of Clinical Observations and System Studies. Melbourne, FL: Krieger, 1994.

    [8] G. Khang and F. E. Zajac, “Paraplegic standing controlled by functional neuromuscular stimulation: Part I-Computer model and control-system design. Part II-Computer simulation studies,” IEEE Trans. Biomed. Eng., vol. 36, pp. 873-894, Sept. 1989.

    [9] R. J. Jaeger, “Design and simulation of closed-loop electrical stimulation orthoses for restoration of quiet standing in paraplegia,” J. Biomech., vol. 19, no. 10, pp. 825-835, 1986.

    [10] N. Donaldson, “Practical ankle controllers for unsupported standing in paraplegia,” in Proc. Ljubljana FES Conf., 1993, pp. 61-64.

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