Dr Bryan Ruddy


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Senior Research Fellow


Bryan graduated from the Massachusetts Institute of Technology in the USA, with a Bachelor of Science (SB) in 2004, a Master of Science (SM) in 2006, and a PhD in 2012, all specialising in Mechanical Engineering. His doctoral research, supervised by Professor Ian W. Hunter in the MIT BioInstrumentation Laboratory, focused on the design and modelling of compact, high-force linear electric motors for use in robotics and in medical devices.

Bryan joined the Auckland Bioengineering Institute as a Research Scientist upon the completion of his PhD, in July 2012. He currently holds a joint appointment as a Senior Research Fellow at the ABI and as a Senior Lecturer with the Department of Engineering Science.

Research | Current

Bryan's work focuses on the development of miniaturized actuation and control systems for use in muscle work-loop calorimetry (the Cardiac Myometer), the design of improved Lorentz-force motors for needle-free jet injection, and the design of high-performance linear synchronous motors for rehabilitation robots and exoskeletons. To accomplish these goals, he works to develop new analytical solutions to the governing equations of these actuators, and uses them for design optimization.

Teaching | Current

ENGSCI 233: Computational Techniques and Computer Systems

BIOMENG 791: Advanced Biomedical Engineering Design

ENGSCI 700: Part IV (Honours) project

Postgraduate supervision

Main Supervisor


  • Linh Ngoc (Nick) Do, Linear synchronous motor design for needle-free injection
  • Soroosh Haji Hosseinnejad, High stroke-to-length ratio direct-drive electromagnetic actuators for upper limb rehabilitation robots
  • Mahsa Momtahan, An intelligent ankle foot orthosis to actively assist walking in patients with neurological disorders
  • Yahya Zakariya Yahya, System Identification Techniques to Diagnose Rotator Cuff Injuries



  • Kieran BrennanReal-time fluid penetration imaging for needle-free jet-injection
  • Jiali Xu, Needle-free blood extraction for insulin therapy using a controllable jet injector
  • Bahareh Madadkhahsalmassi, Just-in-time glucose sensing for a jet-injector based diabetes management system
  • Homayoon Zarshenas, EMG-informed control strategies for assistive robotics

Areas of expertise

  • Actuator technology
  • Analytical approaches to continuum modelling and design optimization
  • Bioinstrumentation

Selected publications and creative works (Research Outputs)

As of 29 October 2020 there will be no automatic updating of 'selected publications and creative works' from Research Outputs. Please continue to keep your Research Outputs profile up to date.
  • Yahya, Y. Z., Besier, T. F., Taberner, A. J., & Ruddy, B. P. (2020). System Identification to Characterise Shoulder Joint Dynamics in Two Degrees of Freedom. Proceedings of the Annual International Conference of the IEEE Engineering in Medicine and Biology Society, EMBS. 10.1109/EMBC44109.2020.9175942
    Other University of Auckland co-authors: Andrew Taberner, Thor Besier
  • Kohls, N., Dias, B., Mensah, Y., Ruddy, B. P., & Mazumdar, Y. C. (2020). Compliant Electromagnetic Actuator Architecture for Soft Robotics.. ICRA.
  • Williams, R. M. J., McKeage, J. W., Ruddy, B. P., Nielsen, P. M. F., & Taberner, A. J. (2019). Viscous Heating Assists Jet Formation During Needle-Free Jet Injection of Viscous Drugs. IEEE transactions on bio-medical engineering, 66 (12), 3472-3479. 10.1109/tbme.2019.2906356
    Other University of Auckland co-authors: Andrew Taberner, James McKeage, Poul Nielsen
  • Do, N. N. L., Taberner, A. J., & Ruddy, B. P. (2019). Design of a Linear Permanent Magnet Transverse Flux Motor for Needle-free Jet Injection. Proceedings 2019 12th International Symposium on Linear Drives for Industry Applications (LDIA) Neuchatel, Switzerland: IEEE. 10.1109/LDIA.2019.8770975
    URL: http://hdl.handle.net/2292/48093
    Other University of Auckland co-authors: Andrew Taberner
  • Ruddy, B. P., Bullen, C., Chu, J. T. W., Jeong, S. H., Madadkhahsalmassi, B., McKeage, J. W., ... Taberner, A. J. (2019). Subcutaneous nicotine delivery via needle-free jet injection: A porcine model. Journal of controlled release : official journal of the Controlled Release Society, 306, 83-88. 10.1016/j.jconrel.2019.05.040
    Other University of Auckland co-authors: Chris Bullen, Joanna Chu, Soo Hee Jeong, James McKeage, Darren Svirskis, Malcolm Tingle, Andrew Taberner
  • Do, N. N. L., Taberner, A. J., & Ruddy, B. P. (2019). Application of Linear Permanent Magnet Flux-Switching Motors to Needle-free Jet Injection. Paper presented at 11th Annual IEEE Energy Conversion Congress and Exposition (ECCE), Baltimore, MD. 29 September - 3 October 2019. 2019 IEEE ENERGY CONVERSION CONGRESS AND EXPOSITION (ECCE). (pp. 8).
    Other University of Auckland co-authors: Andrew Taberner
  • Do, N. N. L., Taberner, A. J., & Ruddy, B. P. (2018). Design of a Portable Pulsed Power System for Needle-Free Jet Injection. 2018 IEEE Energy Conversion Congress and Exposition, ECCE 2018. 10.1109/ECCE.2018.8557608
    Other University of Auckland co-authors: Andrew Taberner
  • Do, N. N. L., Taberner, A. J., & Ruddy, B. P. (2018). A Linear Permanent Magnet Synchronous Motor for Large Volume Needle-free Jet Injection. IEEE Transactions on Industry Applications, 55 (2), 1-1. 10.1109/TIA.2018.2880417
    Other University of Auckland co-authors: Andrew Taberner


Contact details

Primary office location

Level G, Room G07
New Zealand

Web links