A Systematic Review of Low-Cost Actuator Implementations for Lower-Limb Exoskeletons: a Technical and Financial Perspective

1. Yagn, N: "Apparatus for Walking, Running, Jumping". United States of America Patent 420,179, (1890)

2. Vukobratovic, M., Hristic, D., Stojiljkovic, Z.: Development of active anthropomorphic exoskeletons. Med. Biol. Eng. 12(1), 66–80 (1974)

   Article  Google Scholar 

3. Specialty Materials Handling Products Operation General Electric Company, Hardiman I Prototype Project. (1968)

4. Zoss, A., Kazerooni, H. Chu, A.: "On the Mechanical Design of the Berkeley Lower Extremity Exoskeleton (BLEEX)," in IEEE/RSJ International Conference on Intelligent Robotics, pp. 3465–3472. (2005)

5. Sankai, Y.:"HAL: Hybrid Assistive Limb based on Cybernics," in Springer Tracts in Advanced Robotics, pp. 25–34. (2007)

6. Stoye, G., Zaranko, B.: "UK Health Spending," The Institute for Fiscal Studies. (2018)

7. Jones, A.: Interviewee, Ectron EksoNR cost. [Interview]. (2021)

8. Centers for Medicare & Medicaid Services: "National Health Expenditures 2019 Highlights," Centers for Medicare and Medicaid Services. (2019)

9. Gonzalez, A., Garcia, L., Kilby, J., McNair, P.: Robotic Devices for Paediatric rehabilitation: a review of design features. Biomed. Eng. Online 20(89), 1–33 (2021)

   Google Scholar 

10. Slucock, T.:"A Systematic Review of Lower-Cost Actuator Implementations for Lower-Limb Exoskeletons - Addendums". [Online]. Available: https://drive.google.com/drive/folders/1VbrkzbnWZbbhKiqB3QxtUqZAcasgIJnX?usp=sharing. (2021). Accessed 17 November 2021

11. Neuhaus, P. D., Noorden, J. H., Craig, T. J., Torres T., Kirschbaum, J., Pratt, J. E.: "Design and Evaluation of Mina a Robotic Orthosis for Paraplegics," in IEEE International Conference of Rehabilitation Robotics. (2011)

12. Moog: "BN34 Specifications," [Online]. Available: https://www.moog.com/content/dam/moog/literature/MCG/BN34-BrushlessDCMotorsDtS.pdf. Accessed 22 November 2021

13. Brundu, A.: Interviewee, Moog BN34–25EU-02 Servo Motor Costs. [Interview]. (2021)

14. Marian, P., Danut, I., Nirvana, P., Dorin, P.: "Engineered Devices to Support Stroke Rehabilitation," in 19th International Conference on Control Systems and Computer Science, pp. 289–295. (2013)

15. Omron: "SGDH Sigma-II servo Drive," [Online]. Available: http://www.farnell.com/datasheets/2923102.pdf. Accessed 2021 November 21

16. Omron: "Sigma-II rotary servo motors," [Online]. Available: https://assets.omron.eu/downloads/datasheet/en/v4/i47e_sgm_h-_sigma-ii_rotary_servo_motors_datasheet_en.pdf. Accessed 21 November 2021

17. Lerner, Z.F., Gasparri, G.M., Bair, M.O., Lawson, J.L., Luque, J., Harvey, T.A., Lerner, A.T.: An Untethered Ankle Exoskeleton Improves Walking Economy in a Pilt Study of Individuals With Cerebral Palsy. IEEE Trans. Neural Syst. Rehabil. Eng. 26(10), 1985–1993 (2018)

    Article  Google Scholar 

18. Maxon: "EC-4pole 22 Ø22 mm, brushless, 90 Watt | High Power," Maxon, [Online]. Available: https://www.maxongroup.com/maxon/view/product/323218. Accessed 21 November 2021

19. Baud, R., Ortlieb, A., Oliver, J., Bouri, M.: "HiBSO hip exoskeleton: Toward a wearable and autonomous design," in MESROB, pp. 185–195. (2016)

20. Maxon: "RE 30 Ø30 mm, Graphite Brushes, 60 Watt," [Online]. Available: https://www.maxongroup.com/medias/sys_master/root/8881622155294/EN-21-148.pdf. Accessed 21 November 2021

21. Maxon: "Screw Drive GP 22 S Ø22 mm, Metric spindle, M6 x 1," [Online]. Available: https://www.maxongroup.com/maxon/view/product/363826. Accessed 08 December 2021

22. Vouga, T., Baud, R., Fasola, J., Bouri, M., Bleuler, H.: "TWIICE - A Lightweight Lower-Limb Exoskeleton for Complete Paraplegics," in IEEE International Conference on Rehabilitaiton Robotics, pp, 1639–1645. (2017)

23. Sonceboz: "Brushless - DC Motors 5612," [Online]. Available: https://pdf.directindustry.com/pdf/sonceboz/brushless-dc-motors-5612/14206-588571.html. Accessed 22 November 2021

24. Yang,W., Yang, C.-J., Wei, Q.-X.: "Design of an Anthropomorphic Lower Extremity Exoskeleton with Compatible Joints," in IEEE International Conference on Robotics and Biomimetics, pp. 1374–1379. (2014)

25. Maxon; "EC 90 flat Ø90 mm, brushless, 90 Watt, with Hall sensors," [Online]. Available: https://www.maxongroup.com/maxon/view/product/323772. Accessed 21 November 2021

26. Zhang, T., Tran, M., Huang, H.: Design and Experimental Verification of Hip Exoskeleton With Balance Capacities for Walking Assistance. IEEE/ASME Trans. Mechatron. 23(1), 274–285 (2018)

    Article  Google Scholar 

27. Minhyung, L., Kim, J., Hyung, S., Lee, J., Seo, K., Park, Y.J., Cho, J., Choi, B.-K., Shim, Y., Choi, H.: A Compact Ankle Exoskeleton With a Multiaxis Parallel Linkage Mechanism. IEEE/ASME Trans. Mechatron. 26(1), 191–202 (2021)

    Article  Google Scholar 

28. Maxon: "DCX 32 L Ø32 mm, Graphite Brushes, ball bearings," [Online]. Available: https://www.maxongroup.com/maxon/view/product/motor/dcmotor/DCX/DCX32/DCX32L01GBKL470. Accessed 22 November 2021

29. Taylor, G.: Interviewee, ABSSAC SG0504 Costs. [Interview]. (2021)

30. Walsh, C. J., Paluska, D., Pasch, K., Grand, W., Valiente, A., Herr, H.: "Development of a lightweight, underactuated exoskeleton for load-carrying augmentation," in IEEE International Conference on Robotics and Automation, pp. 3485–3491 (2006)

31. Maxon: "RE 40 Ø40 mm, Graphite Brushes, 150 Watt," [Online]. Available: https://www.maxongroup.com/maxon/view/product/motor/dcmotor/re/re40/148866. Accessed 21 November 2021

32. Colombo, G., Jorg, M., Schrier, R., Dietz, V.: Treadmill training of paraplegic patinets using a robotic orthosis. J. Rehabil. Res. Dev. 37(6), 693–700 (2000)

    Google Scholar 

33. Michimizos, K. P., Krebs, H. I.: "Assist-as-needed in Lower Extremity Robotic Therapy for Children with Cerebral Palsy," in IEEE International Conference on Biomedical Robotics and Biomechatronics, pp. 1081–1086 (2012)

34. "EC-4pole 22 Ø22 mm, brushless, 90 Watt | High Power," [Online]. Available: https://www.maxongroup.com/maxon/view/product/327739. Accessed 21 November 2021

35. Kardan, I., Akbarzadeh, A.: Robust output feedback assistive control of a compliantly actuated knee exoskeleton. Robot. Auton. Syst. 98, 15–29 (2017)

    Article  Google Scholar 

36. Ortlieb, A., Bouri, M., Baud, R., Bleuler, H.:"An Assistive Lower Limb Exoskeleton for People with Neurological Gait Disorders," in International Conference on Rehabiliation Robotics, pp. 441–446 (2017)

37. Maxon: "Planetary Gearhead GP 32 HP Ø32 mm, 4.0 - 8.0 Nm, Metal Version, High Power | High Power," [Online]. Available: https://www.maxongroup.com/maxon/view/product/326671. Accessed 22 November 2021

38. Washabaugh, E.P., Claflin, E.S., Gillespie, R.B., Krishnan, C.: A Novel Application of Eddy Current Braking for Functional Strength Training During Gait. Ann. Biomed. Eng. 44(9), 2760–2773 (2016)

    Article  Google Scholar 

39. The Robot Marketplace: "Banebots Gearboxes," [Online]. Available: http://www.robotcombat.com/products/0-P60K-55-0004.html. Accessed 2 December 2021

40. Anonymous-Company: Interviewee, Strain Wave Gear Example Price. [Interview]. (2021)

41. He, Y., Li, N., Wang, C., Xia, L.-Q., Yong, X., Wu, X.-Y.: Development of a novel autonomous lower extremity exoskeleton robot for walking assistance. Front. Inf. Technol. Electron. Eng. 30, 318–329 (2019)

    Article  Google Scholar 

42. Felix, P., Figueiredo, J., Santos, C. P., Moreno, J. C.: "Powered Knee Orthosis for Human Gait Rehabilitation: First Advances," in IEEE 5th Portuguese Meeting on Bioengineering, pp. 1–4. (2017)

43. Park, J.-H., Lee, J.-S., Shin, J.-S., Cho, B.-K.: "Design of a Lower Limb Exoskeleotn Including Roll Actuation to Assist Walking and Standing Up," in IEEE-RAS 15th International Conference on Humanoid Robotics (Humanoids), pp. 359–364. (2015)

44. Maxon: "Encoder ENC 16 RIO, 16384 counts per turn, 3-channel, with RS 422 line driver," [Online]. Available: https://www.maxongroup.com/maxon/view/product/575829. Accessed 2 December 2021

45. RLS: " RMB28 Rotary Magnetic Encoder Module," [Online]. Available: https://www.rls.si/eng/rmb28-rotary-magnetic-module?partNumbers=RMB28IC10BS11. Accessed 2 December 2021

46. Mouser Electronics: "HEDL-5640#A13," [Online]. Available: https://www.mouser.co.uk/ProductDetail/Broadcom-Limited/HEDL-5640A13?qs=sGAEpiMZZMuGN2ig0xo6GwpPTpKC14je. Accessed 2 December 2021

47. Emken, J.L., Wynne, J.H., Harkema, S.J., Reinkensmeyer, D.J.: A Robotic Device for Manipulating Human Stepping. IEEE Trans. Rob. 22(1), 185–189 (2006)

    Article  Google Scholar 

48. RS: "Models HSR-A and HSR-AM, Models HSR-LA and HSR-LAM," [Online]. Available: https://docs.rs-online.com/1cbb/0900766b80f448f1.pdf. Accessed 13 January 2022

49. Pietrusinski, M., Unluhisarcikli, O., Cajigas, I., Bonato, P.: "Design of Human - Machine Interface and Altering of Pelvic Obliquity with RGR Trainer," in IEEE International Conference on Rehabilitation Robotics, pp. 1–6. (2011)

50. KOMP-ACT: "KLM-40–0F4 KOMP-ACT LINEAR MOTOR," [Online]. Available: https://komp-act.com/wp-content/uploads/2021/06/KLM-40-0F4.pdf. Accessed 16 December 2021

51. Saito, Y., Kikuchi, H., Negoto, H., Oshima, T., Haneyoshi, T., Hatoyama-cho, I., Saitama, H.-G.: "Development of externally powered lower limb orthosis with bilateral-servo actuator," in 9th International Conference on Rehabilitation Robotics, pp. 394–399. (2005)

52. Zoss, A.B., Kazerooni, H., Chu, A.: Biomechanical Design of the Berkeley Lower Extremity Exoskeleton (BLEEX). IEEE/ASME Trans. Mechatron. 11(2), 128–138 (2006)

    Article  Google Scholar 

53. Kaminaga, H., Amari, T., Niwa, Y., Nakamura, Y.: "Development of knee power assist using backdrivable electro-hydrostatic actuator," in IEEE/RSJ International Conference on Intelligent Robots and Systems, pp. 5517–5524. (2010)

54. Kim, H.G., Lee, J.W., Jang, J., Park, S., HC: Design of an Exoskeleton with minimized energy consumption based on using elastic and dissipative elements. Int. J. Control Autom Syst 13(2), 463–474 (2015)

    Article  Google Scholar 

55. Sun, M., Ouyang, X., Mattila, J., Yang, H., Hou, G.: One Novel Hydraulic Actuating System for the Lower-Body Exoskeleton. Chin. J. Mech. Eng. 34(1), 1–10 (2021)

    Article  Google Scholar 

56. Staman, K., Vaele, A.J., van der Kooij, H.: Design, control and evaluation of the Electro-Hydrostatic Actuator, PREHydrA, for Gait Restoration Exoskeleton Technology. IEEE Trans. Med. Robot. Bionics 3(1), 156–165 (2021)

    Article  Google Scholar 

57. Kollmorgen: "AKM Servo Motor Selection Guide," [Online]. Available: https://cdn.kyklo.co/assets/ W1siZiIsIjIwMjEvMDMvMjEvMTIvNTUvMzcvNzY1Mjg2NGItNjIzNi00OWFjLWIyYzMtMGY0OTRmYmU3ZjZkL0tvbGxtb3JnZW4lMjAtJTIwQUtNJTIwc2VyaWVzJTIwLSUyMENhdGFsb2clMjAyMDE3LnBkZiJdXQ?sha=a34ad8186ed4c2fa. Accessed 8 December 2021

58. Minuteman | Empire: "9/16” Heavy Duty, Double Acting, Clevis Mount, 6," [Online]. Available: https://shop.maseas.com/9-16-heavy-duty-double-acting-clevis-mount-6-h9c-6d.html. Accessed 8 December 2021

59. iAutomation: "AKM22C-BNBNC-00," [Online]. Available: https://shop.i-automation.com/products/AKM22C-BNBNC-00. Accessed 8 December 2021

60. Wang, B., Liang, Y., Xu, D., Wang, Z., Ji, J.: Design on Electrohydraulic servo driving system with walking assisting control for lower limb exoskeleton robot. Int J Advanced Robotic Systems 18(1), 1–17 (2021)

    Article  Google Scholar 

61. H. Wu, A. Kitagawa, H. Tsukagoshi and C. Liu, "Development of a Novel Pneumatic Power Assisted Lower Limb for Outdoor Walking by the Use of a Portable Pneumatic Power Source," in 16th IEEE International Conference on Control Applications, pp. 1291–1296, 2007.

62. Fujikura Composites: "BF Cylinder," [Online]. Available: https://www.fujikura-control.com/english/product_info/index.php/search?cell003=Air+Cylinders&cell004=BF+cylinder&label=1. Accessed 23 November 2021

63. Sato, M., Yagi, E.: "A Study on Power Assist Suit Using Pneumatic Actuators Based on Calculated Retaining Torques for Lift-Up Motion," in SICE Annual Conference, pp. 628–632. (2011)

64. RS: "RS PRO Pneumatic Profile Cylinder 32mm Bore, 200mm Stroke, CDEM Series, Double Acting," [Online]. Available: https://uk.rs-online.com/web/p/pneumatic-piston-rod-cylinders/4802169. Accessed 1 December 2021

65. Li, Y. D., Hsiao-Wekscler, E. T.: "Gait Mode Recognition and Control for a Portable-Powered Ankle Foot Orthosis," in IEEE International Conference on Rehabilitation Robotics, pp. 1–8. (2013)

66. Parker: "Pneumatic Rotary Actuators," [Online]. Available: https://www.parker.com/Literature/Pneumatics%20Division%20Europe/PDE-Documents/Cylinders/Parker_Pneumatic_PRO-PRN_Pneumatic_Rotary_Actuators_PDE2502TCUK.pdf. Accessed 8 December 2021

67. Tidyco: "PRN30D-90–45," [Online]. Available: https://tidyco.co.uk/store/parker-hannifin/parker-hannifin-detail.asp?ProductID=PRN30D-90-45. Accessed 21 November 2021

68. Yamada, Y., Endo, G., Fukushima, E.F.: Pneumatic walking assistive deice for use over long period. Adv. Robot. 28(18), 1253–1264 (2014)

    Article  Google Scholar 

69. Zheng, H., Shen, T., Afsar, M. R., Kang, I., Young, A. J., Shen, X.: "A Semi-Wearable Robotic Device for Sit-to-Stand Assistance," in IEEE 16th International Conference on Rehabilitation Robotics, pp. 204–209. (2019)

70. Bimba: "Original Line® Air Cylinder," [Online]. Available: https://www.bimba.com/en/detail/original-line-cylinder?rp=173.5-DPY. Accessed 21 November 2021

71. Yamamoto, S., Miyoshi, T., Komeda, T., Hiramatsu, K., Nakazawa, K., Akai, M.: "Development of Pneumatic Gait Assist System," in IEEE/ICME International Conference on Coplex Medical Engineering, pp. 1337–1340. (2007)

72. Chandrapal, M., Chen, X.: "Intelligent Active Assistive and Resistive Orthotic Device for Knee Rehabilitation," in IEEE International Conference on Control and Automation, pp. 1880–1885. (2009)

73. Park, Y.-L., Chen, B.-R., Young, D., Stirling, L., Wood, R. J., Goldfield, E., Nagpal, R.: "Bio-inspired Active Soft Orthotic Device for Ankle Foot Pathologies," in IEEE/RSJ International Conference on Intelligent Robots and Systems, pp. 4488–4495. (2011)

74. FESTO: "Fluidic muscle DMSP," [Online]. Available: https://www.festo.com/media/pim/555/D15000100140555.PDF?siteUid=fox_gb&siteName=Festo+GB. Accessed 16 December 2021

75. FESTO: "Fluidic muscle," [Online]. Available: https://www.festo.com/gb/en/a/download-document/datasheet/541403/?CallerID=QuickSearch. Accessed 16 December 2021

76. Sasaki, D., Noritsugu, T., Takaiwa, M.: "Development of Pneumatic Lower Limb Power Assist Wear without Exoskeleton," in IEEE/RSJ International Conference on Intelligent Robots and Systems, pp. 1239–1244. (2012)

77. Sasaki, D., Noritsugu, T., Takaiwa, M.: "Development of Pneumatic Lower Limb Power Assist Wear driven with Wearable Air Supply System," in IEEE/RSJ International Conference on Intelligent Robots and Systems, pp. 4440–4445. (2013)

78. Chung, J., Heimgartner, R., O'Neill, C. T., Phipps, N. S., Walsh, C. J.: "ExoBoot, a soft inflatable robotic boot to assist ankle during walking: Design, Characterization, and Preliminary Tests," in 7th IEEE International Conference on Biomedical Robotics and Biomechatronics, pp. 509–516. (2018)

79. Park, J., Choi, J., Kim, S.J., Seo, K.-H., Kim, J.: Design of an Inflatable Wrinkle Actuator With Fast Inflation/Deflation Responses for Wearable Suits. IEEE Robot. Autom. Lett. 5(3), 3799–3805 (2020)

    Article  Google Scholar 

80. Mauer: "EMGR - EAS 90 L4," [Online]. Available: https://www.motor-mauer.de/elektromotor-wechselstrom-lichtstrommotor-emgr-eas90l4-wechselstrommotor-einphasen-230-v-motor-shop-kaufen-1-1-kw-1500-min-1. Accessed 14 December 2021

81. Thalman, C. M., Hertzell, T., Lee, H.: "Toward A Soft Robotic Ankle-Foot Orthosis (SR-AFO) Exosuit for Human Locomotion: Preliminary Results in Late Stance Plantarflexion Assistance," in 3rd IEEE International Conference on Soft Robotics, pp. 801–807 (2020)

82. PAR Group Ltd.: "TPU93 Thermoplastic Polyurethane - Orange BANCOLLAN, Technical Data Sheet," [Online]. Available: https://www.par-group.co.uk/site-content/1/Docs/updates/1-rubber-and-polyurethane/1.26-tpu93-thermoplastic-polyurethane-orange-bancollan-tds.pdf. Accessed 10 December 2021

83. Rockywoods: "200 DENIER COATED OXFORD NYLON FABRIC (SOLD PER YARD)," [Online]. Available: https://www.rockywoods.com/200-Denier-Packcloth-Nylon-Fabric. Accessed 10 December 2021

84. KOMP-ACT: "KDRV-1-MK-X-X Electronic Controller," [Online]. Available: https://komp-act.com/wp-content/uploads/2021/06/KDRV-1-MK-X-X.pdf. Accessed 16 December 2021

85. Chinchwad, Pimpri: Hydraulic Valves, Actuators, and Accessories.

86. iAutomation: "S20260-VTS," [Online]. Available: https://shop.i-automation.com/products/S20260-VTS. Accessed 8 December 2021

87. Adami, M., Seibel, A.: On-Board Pneumatic Pressure Generation Methods for Soft Robotics Applications. Actuators 8(2), 1–35 (2019)

    Google Scholar 

88. Hussain, S., Xie, S.Q., Jamwal, P.K., Parsons, J.: An Intrinsically Compliant Robotic Orthosis for Treadmill training. Med. Eng. Phys. 34(10), 1448–1453 (2012)

    Article  Google Scholar 

89. Costa, N. R. S., Caldwell, D. G.: "Control of a Biomimetic "Soft-Actuated" Lower Body 10DOF Exoskeleton," in The First IEEE/RAS-EMBS International Conference on Biomedical Robotics and Biomechatronics, pp. 495–501 (2006)

90. Johnson, D. C., Repperger, D. W., Thompson, G.:"Development of a Mobility Assist for the paralyzed, Amputee, and Spastic Patient," in Fifteenth Southern Biomedical Engineering Conference, pp. 67–70 (1996)

91. Gu, Y., Lv, Y., Ma, X., Lu, C.: "Lower-Limb Soft Orthotic Device for Gait Assistance," in 4th Information Technology and Mechatronics Engineering Conference, pp. 894–897. (2018)

92. Sasaki, D., Nortisugu, T., Takaiwa, M.: Development of High Contractile Pneumatic Artificial Rubber Muscle for Power Assist Device. J. Robot. Mechatronics 24(1), 150–157 (2012)

    Article  Google Scholar 

93. MegaDepot: "STC 2S020–1/8A-3-D-V 2S020 Direct Acting 2 Way SS Solenoid Valve," [Online]. Available: https://megadepot.com/product/stcvalve-2s020-1-8a-3-d-v-2s020-110vac-din-coil-1-8-npt-9mm-direct-acting-2-way-ss-solenoid-valve. Accessed 19 December 2021

94. Wright, L. G. M. A. C. Kathy: Interviewee, Humphrey Enquiry. [Interview]. (2021)

95. ANSgear: "NINJA DURA PRO SLP CARBON FIBER AIR TANK - 68/4500 - BLACKOUT," [Online]. Available: https://www.ansgear.com/Ninja_Dura_Pro_SLP_Carbon_Fiber_Air_Tank_68_4500_p/ninjatankpro-68slpdurablackout.htm. Accessed 19 December 2021

96. DeWALT: "D55146 - 1.6 HP Continuous. 225 PSI, 4.5 Gallon Compressor," [Online]. Available: https://www.dewalt.com/products/storage-and-gear/air-compressors/16-hp-continuous-225-psi-45-gallon-compressor/d55146. Accessed 19 December 2021

97. MAUER: "EMGR 90 L4," [Online]. Available: https://www.motor-mauer.de/elektromotor-wechselstrom-lichtstrommotor-emgr-eas90l4-wechselstrommotor-einphasen-230-v-motor-shop-kaufen-1-1-kw-1500-min-1. Accessed 19 December 2021

98. California Air Tools: "California Air Tools 8010A," [Online]. Available: https://www.californiaairtools.com/ultra-quiet-series-of-air-compressor-contractor-grade/1-0-hp-air-compressors/cat-8010a/. Accessed 19 December 2021

99. Kohki, Nitto: "DAH 110," [Online]. Available: http://www.nitto-kohki.eu/en/products-en/pumps-a-compressors/dc-pumps/item/dah-110.html. [Accessed 19 December 2021

100. TOPSFLO: "TMD41A-A," [Online]. Available: http://www.topsflo.com/mini-diaphragm-pump/tmd45-diaphragm-pump.html#Specifications. Accessed 19 December 2021

101. Dandy, T.: Interviewee, Topsflo Diaphragm Pump. [Interview]. (2021)

102. Kohki, L. L. -. N: Interviewee, DAH 110 Information. [Interview]. (2021)

103. Mooney, L. M., Rouse, E. J., Herr, H. M.: "Autonomous Exoskeleton Reduces Metabolic Cost of Walking," in 36th Annual International Conference of the IEEE Engineering in Medicine and Biology Society, pp. 1–11 (2014)

104. Bryan, G.M., Franks, P.W., Klein, S.C., Peuchen, R.J., Collins, S.H.: A Hip-knee-ankle exoskeleton emulator for studying gait assistance. Int. J. Robot. Res. 40(4–5), 722–746 (2021)

     Article  Google Scholar 

105. Jin, X., Cui, X., Agrawal, S. K.: "Design of a Cable-driven Active Leg Exoskeleton (C-ALEX) and Gait Training Experiments with Human Subjects," in IEEE International Conference on Robotics and Automation, pp. 5578–5583, 2015.

106. Lee, Y., Lee, J., Choi, B., Lee, M., Roh, S.-G., Kim, K., Seo, K., Kim, Y.-J., Shim, Y.: Flexibile Gait Enhancing Mechatronics System for Lower Limb Assistance (GEMS L-Type). IEEE/ASME Trans. Mechatron. 24(4), 1520–1531 (2019)

     Article  Google Scholar 

107. Asbeck, A. T., Dyer, R. J., Larusson, A. F., Walsh, C. J.: "Biologically-inspired Soft Exosuit," in IEEE International Conference on Rehabilitation Robotics, pp. 1–8. (2013)

108. Mioskowska, M., Stevenson, D., Onu, M., Trkov, M.: "Compressed Gas Actuated Knee Assistive Exoskeleton for Slip-Induced Fall Prevention During Human Walking," in IEEE/ASME International Conference on Advanced Intelligent Mechatronics, pp. 735–740. (2020)

109. Kong, K., Jeon, D.: Design and Control of an Exoskeleton for the Elderly and Patients. IEEE/ASME Int. Trans. Mechatronics 11(4), 428–432 (2006)

     Article  Google Scholar 

110. Schmidt, K., Duarte, J.E., Grimmer, M., Alejandro, S.-P.: The Myosuit: Bi-Articular Anti-gravity Exosuit That Reduces Hip Extensor Activity in Sitting Transfers. Front. Neutorobot. 11(57), 1–16 (2017)

     Google Scholar 

111. M. Gloger, G. Obinata, E. Genda, J. Babjak and Y. Pei, "Active Lower Limb Orthosis with One Degree of Freedom for People with Paraplegia," in International Conference on Rehabilitation Robotics, pp. 258–263, 2017.

112. Van den Bogert, A.J.: Exotendons for Assistance of Human Locomotion. Biomed. Eng. Online 2(17), 1–8 (2003)

     Google Scholar 

113. Symons, C.: Interviewee, Carl Stahl Sava Industries steel cable 2081 Price. [Interview]. (2021)

114. Garcia, P.: Interviewee, Lexco 415310–00 outer cable Price. [Interview]. (2021)

115. Veneman, J.F., van der Helm, F.C., van der Kooij, H.: A Series Elastic- and Bowden-Cable-Based Actuation System for Use as Torque Actuator in Exoskeleton-Type Robots. Int. J. Robot. Res. 25(3), 261–281 (2006)

     Article  Google Scholar 

116. Veneman, J.F., Kruidhof, R., Hekman, E.E.G., Ekkelenkamp, R., Van Asseldonk, E.H.F., van der Kooij, H.: Design and Evaluation of the LOPES Exoskeleton Robot for Interactive Gait Rehabilitation. IEEE Trans. Neural Syst. Rehabil. Eng. 15(3), 379–386 (2007)

     Article  Google Scholar 

117. Maxon: "EC-4pole 30 Ø30 mm, brushless, 200 Watt," [Online]. Available: https://www.maxongroup.com/maxon/view/product/motor/ecmotor/ec4pole/305013. Accessed 21 November 2021

118. Nokon: "Products - Gear Systems," [Online]. Available: http://www.nokon.com/NokonUSA_Products%20(black).htm. Accessed 21 November 2021

119. Maxon: "EC-4pole 30 Ø30 mm, brushless, 200 Watt | High Power," [Online]. Available: https://www.maxongroup.com/maxon/view/product/305015. Accessed 21 November 2021

120. EC-i 40 Ø40 mm, brushless, 70 Watt, with Hall sensors, [Online]. Available: https://www.maxongroup.com/maxon/view/product/449470. Accessed 21 November 2021

121. Maxon: "EC-i 30 Ø30 mm, brushless, 75 W, with Hall sensors | High Torque," [Online]. Available: https://www.maxongroup.com/maxon/view/product/539485. Accessed 21 November 2021

122. Banala, S.K., Agrawal, S.K., Fattah, A., Krishnamoorthy, V., Hsu, W.-L., Scholz, J., Rudolph, K.: Gravity-Balancing Leg Orthosis and Its Performance Evaluation. IEEE Trans. Rob. 22(6), 1228–1239 (2006)

     Article  Google Scholar 

123. Wiggin, B., Sawicki, G. S., Collins, S. H.: "An Exoskeleton Using Controlled Energy Storage and Release to Aid Ankle Propulsion," in International Conference on Rehabilitation Robotics, pp. 1–5 (2011)

124. Ranaweera, R., Mann, G., Gopura, R.C.: Development of a Passively Powered Knee Exoskeleton for Squat Lifting. J. Robot. Netw. Artif. Life 5(1), 45–51 (2018)

     Article  Google Scholar 

125. Zhou, T., Xiong, C., Zhang, J., Chen, W., Huang, X.: Regulating Metabolic Energy Among Joints During Human Walking Using a Multiarticular Unpowered Exoskeleton. IEEE Trans. Neural Syst. Rehabil. Eng. 29, 662–672 (2021)

     Article  Google Scholar 

126. Wu, P., Chen, X., He, Y., Liu, Z.: "Unpowered Knee Exoskeleton during Stair Descent," in The 7th International Conference on Mechatronics and Robotics Engineering, pp. 106–110. (2021)

127. Giovacchini, F., Vannetti, F., Fantozzi, M., Cempini, M., Cortese, M., Parri, A., Tingfang, Y., Lefeber, D., Vitiello, N.: A Light-Weight Active Orthosis for Hip movement assistance. Robot. Auton. Syst. 73, 123–134 (2015)

     Article  Google Scholar 

128. Maxon: "EC 60 flat Ø60 mm, brushless, 100 Watt, with cover," [Online]. Available: https://www.maxongroup.com/maxon/view/product/motor/ecmotor/ecflat/ecflat60/408057. Accessed 18 December 2021

129. Kai, Y., Kitaguchi, S., Shotaro, K., Zhang, W., Tomizuka, M.: "Development of a Rehabilitation Robot Suit with Velocity and Torque-based Mechanical Safety Devices," in IEEE/RSJ International Conference on Intelligent Robots and Systems, pp. 1380–1385. (2014)

130. Maxon: "RE 40 Ø40 mm, Graphite Brushes, 150 Watt," [Online]. Available: https://www.maxongroup.com/maxon/view/product/148867. Accessed 18 December 18

131. MiSUMi: "Round Wire Coil Springs/Deflection 45%/I.D. Referenced (VUR8–20)," [Online]. Available: https://uk.misumi-ec.com/vona2/detail/110302604640/?HissuCode=VUR8-20. Accessed 8 December 2021

132. Alouane, M.A., Huo, W., Rifai, H., Amirat, Y., Mohammed, S.: Hybrid FES-Exoskeleton Controller to Assist Sit-To-Stand Movement. IFAC-PapersOnLine 51(34), 296–301 (2019)

     Article  Google Scholar 

133. Nikitczuk, J., Weinburg, B., Mavroidis, C.: "Rehabilitative Knee Orthosis Driven by Electro-Rheological Fluid Based Actuators," in IEEE International Conference on Robotics and Automation, pp. 2283–2289. (2005)

134. Zite, J. L., Ahmadkhanlou, F., Neelakantan, V. A., Washington, G. N.: "A Magnetorheological fluid based orthopedic active knee brace," in Smart Structures and Materials 2006: Industrial and Commercial Applications of Smart Structures Technologies, pp. 1–10. (2006)

135. Li, Y., Hashimoto, M.: Design and prototyping of a novel lightweight walking assist wear using PVC gel soft actuators. Sens. Actuators 239, 26–44 (2016)

     Article  Google Scholar 

136. Cheng, C.-Y., Okamoto, S., Li, P., Akiyama, Y., Qiu, C., Yamada, Y.: "Encouragement of Squat-Lifting: Feasability Study of a Highly Usable Passive Knee Assistive Device," in International Symposium on System Integration, pp. 504–508. (2020)

137. Yoshimi: "Shape memory alloy / taper wire φ1.5–0.7 × 300mm," [Online]. Available: https://www.yoshimi-inc.com/shopbrand/ct32/. Accessed 21 November 2021

138. Mueller Sports Medicine: "Self-Adjusting™ Hinged Knee Brace," [Online]. Available: https://www.muellersportsmed.com/b2c-us/en/Open-Catalog/By-Sport/Gymnastics/SELF-ADJUSTING-HINGED-KNEE-BRACE-OSFM/p/6455. Accessed 21 November 2021

139. Yoshizawa, N.: "Powered AFO for Achilles Tendon Rupture," in 30th Annual International IEEE EMBS Conference, pp. 4250–4253. (2008)

140. Washabaugh, E.P., Krishnan, C.: A Wearable Resistive Robot Facilitates Locomotor Adaptions during Gait. Resorative Neurol. Neurosci. 36(2), 215–223 (2018)

     Article  Google Scholar 

141. K&J Magnetics, Inc.: "DX04B-N52," [Online]. Available: https://www.kjmagnetics.com/proddetail.asp?prod=DX04B-N52. Accessed 21 November 2021

142. Chaichaowarat, R., Macha, V., Wannasuphoprasit, W.: "Passive Knee Exoskeleton Using Brake Torque to Assist Stair Ascent," in IEEE Region 10 Conference, pp. 1165–1170 (2020)

143. Misumi, "Warner series brake (Sinfonia Technology) (PB-260/FMS-AG)," [Online]. Available: https://us.misumi-ec.com/vona2/detail/221004995844/?HissuCode=PB-260%2fFMS-AG. Accessed 21 November 2021

144. Mankala, K. K., Banala, S. K., Agrawal, S. K.: "Passive Swing Assistive Exoskeletons for Motor-Incomplete Spinal Cord Injury Patients," in IEEE International Conference on Robotics and Automation, pp. 3761–3766. (2007)

145. Jin, S., Guo, S., Hashimoto, K., Xiong, X., Yamamoto, M.: "A Soft Wearable Robotic Suit for Ankle and Hip Assistance a Preliminary Study," in 40th Annual International Conference of the IEEE Engineering in Medicine and Biology Society, pp. 1867–1870. (2018)

146. Pratt, G. A., Williamson, M. M.: "Series Elastic Actuators," in IEEE/RSJ International Conference on Intelligent Robots and Systems. Human Robot Interaction and Cooperative Robots, pp. 399–406. (1995)

147. Madden, J.D.W., Vandesteeg, N.A., Anquetil, P.A., Madden, P.G.A., Takshi, A., Pytel, R.Z., Lafontaine, S.R., Wieringa, P.A., Hunter, I.W.: Artificial Muscle Technology: Physical Priciples and Naval Prospects. IEEE J. Oceanic Eng. 29(3), 706–728 (2004)

     Article  Google Scholar 

148. Allen, D.P., Little, R., Laube, J., Warren, J., Voit, W., Gregg, R.D.: Towards an ankle-foot orthosis powered by a dielectric elastomer actuator. Mechatronics 76(102551), 1–13 (2021)

     Google Scholar 

149. Moltedo, M., Bacek, T., Junius, K., Vanderborght, B., Lefeber, D.: "Mechanical Design of a Lightweight Compliant and Adaptable Active Ankle Foot Orthosis," in IEEE RAS/EMBS International Conference on Biomedical Robotics and Biomechatronics, pp. 1224–1229 (2016)

150. SODEMANN Industrial Springs: "Compression Springs | Produced in Stainless Steel," SODEMANN, [Online]. Available: https://www.industrial-springs.com/products/compression-springs/range-a-b-stainless-steel?a_004=29315_29315&a_006=33271_33284. Accessed 06 September 2021

151. Malkawi, S., Al-Nimr, M., Azizi, D.: A multi-criteria optimization analysis for Jordan’s energy mix. Energy 127, 680–696 (2017)

     Article  Google Scholar 

152. Pinto, D., Garnier, M., Baras, J., Chang, S.-H., Charlifue, S., Field-Fote, E., Furbish, C., Tefertiller, C., Mummidisetty, C.K., Taylor, H., Jayaraman, A., Heinemann, A.W.: Budget impact analysis of robotic exoskeleton use for locomotor training following spinal cord injury in four SCI Model Systems. J. Neuroeng. Rehabil. 17(4), 1–13 (2020)

     Google Scholar 

153. Brancato, E.L.: Estimation of Lifetime Expectancies of Motors. IEEE Electr. Insul. Mag. 8(3), 5–13 (1992)

     Article  Google Scholar 

154. Maxon: "Technology - short and to the point," November 2014. [Online]. Available: https://www.maxongroup.com/medias/sys_master/root/8815461597214/DC-Technology-short-and-to-the-point-14-EN-30-31.pdf?attachment=true. Accessed 15 April 2022

155. Woo, S.-W.: Estimating the Lifetime of the Pneumatic Cylinder in Machine Tool Subjected to Repetitive Pressure Loading. J. US-China Public Adm. 15(5), 221–238 (2018)

     Google Scholar 

156. Bimba: "Cylinder Life Expectancy," May 2012. [Online]. Available: https://airinc.net/wp-content/uploads/2014/08/Original-Line-Cylinder_Life_Expectancy-1.pdf. Accessed 15 April 2022

157. Baldor: "Cog-free Brushless Servo Motors," [Online]. Available: https://literature.puertoricosupplier.com/024/MN23295.pdf. Accessed 27 November 2021

158. Baldor: "Servo, Linear & Motion Control," [Online]. Available: http://www.rgspeed.com/assets/documents/feedback/baldor/servo-linear-and-motion-control.pdf. Accessed 21 November 2021

159. Copley Controls Corp.: "ServoTube Application Guide," [Online]. Available: https://www.actronic-solutions.de/files/actronic/FTPROOT/Servotube-AppGuide.pdf. Accessed 1 December 2021

160. Kollmorgen: [Online]. Available: https://www.kollmorgen.com/sites/default/files/public_downloads/s200_vts_e.pdf. Accessed 8 December 2020

161. Elektromotoren: "Electric Motors," [Online]. Available: https://www.motor-mauer.de/mediafiles/datasheets/EMGR/EMGR-Hauptkatalog.pdf. Accessed 14 December 2021

162. FESTO: "Valve series VOVG," [Online]. Available: https://www.festo.com/cat/en-gb_gb/data/doc_ENUS/PDF/US/VOVG_ENUS.PDF. Accessed 19 December 2021

163. Parker, C., Borisoff, J.F., Mortenson, W.B., Mattie, J.: A Survey of stakeholder perspectives on exoskeleton technology. J. Neuroeng. Rehabil. 11(169), 1–10 (2014)

     Google Scholar 

164. Wang, S., Wang, L., Meijneke, C., Asseldonk, E. V., Hoewllinger, T., Cheron, G., Ivanenko, Y., Scaleia, V. L., Sylos-Labini, F., Molinari, M., Tamburella, F., Pisotta, I., Thorsteinsson, F., Ilzkovtiz, M., Gancet, J., Nevatia, Y., Hauffe, R., Zanow F., Van der Kooij, H.: Design and Control of the MINDWALKER Exoskeleton. IEEE Trans. Neural Syst. Rehabil. Eng. 23(2), 277–286 (2015)

165. Bartenbach, V., Gort, M., Riener, R.: "Concept and Design of a Modular Lower Limb Exoskeleton," in International Conference on Biomedical Robotics and Biomechatronics, pp. 649–654 (2016)

166. Morichika, T., Kikkawa, F., Oyama, O., Yoshimitsu, T.: "Development of Walking Assist Equipment with Pneumatic Cylinder," in SICE Annual Conference, pp. 1058–1063. (2007)

167. TSI Solutions: "173.5-DPY Bimba 1–1/2" x 3.5" Original Line Cyl," TSI Solutions, [Online]. Available: https://www.tsisolutions.us/itemdetail/?itemCode=173.5-DPY. Accessed 6 September 2021

168. Dan: "Single-Acting Cylinders," Hydraulic Schematic Troubleshooting, 01 June 2018. [Online]. Available: http://www.hydraulicstatic.com/20180601_single-acting-cylinders.html. Accessed 04 Sep 2021

169. Dan: "Double-Acting Cylinder with a Piston Rod on One Side," Hydraulic Schematic Troubleshooting, 09 May 2019. [Online]. Available: http://www.hydraulicstatic.com/20190509_double-acting-cylinder-with-a-piston-rod-on-one-side.html. Accessed 04 September 2021

170. RS: "Bosch Rexroth Fixed Hydraulic Cylinder 100mm Stroke, 2952993400," [Online]. Available: https://uk.rs-online.com/web/p/fixed-hydraulic-cylinders/2638556/. Accessed 08 December 2021

171. HosesDirect: "BLACK COMPRESSED AIR HOSE WITH YELLOW STRIPE 20 BAR AIR HOSE. 15/30/100M COILS," [Online]. Available: https://www.hoses.co.uk/images/datasheets/BYA-6.pdf. Accessed 10 December 2021

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