Dr Bryan Ruddy



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, to continue his work on actuator design and control with particular application to biological instrumentation. Bryan is now a Research Fellow at the ABI. He also holds a joint appointment with the Department of Engineering Science where he is a Lecturer.

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

BIOMENG 241: Instrumentation and Design

BIOMENG 791: Advanced Biomedical Engineering Design

ENGSCI 700: Part IV (Honours) project

Postgraduate supervision

Main Supervisor




  • James McKeage, High-volume jet-injection
  • 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

Areas of expertise

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

Selected publications and creative works (Research Outputs)

  • Ruddy, B., Dixon, A. W., Williams, R. M. J., & Taberner, A. J. (2017). Optimization of portable electronically-controlled needle-free jet injection systems. IEEE/ASME Transactions on Mechatronics, 22 (5), 2013-2021. 10.1109/TMECH.2017.2725345
    URL: http://hdl.handle.net/2292/36184
    Other University of Auckland co-authors: Alex Dixon, Andrew Taberner
  • Ruddy, B. P. (2017). Application of the thermal fin approximation to modeling voice coil magnetic fields and performance. IEEE Transactions on Magnetics, 53 (5)10.1109/TMAG.2017.2678464
  • Do, N., Taberner, A., & Ruddy, B. (2017). Design of a linear permanent magnet synchronous motor for needle-free jet injection. 2017 IEEE Energy Conversion Congress and Exposition (ECCE), 4734-4740. Cincinnati, OH, USA. 10.1109/ECCE.2017.8096806
    Other University of Auckland co-authors: Andrew Taberner
  • Li, X., Ruddy, B., & Taberner, A. (2016). Characterization of needle-assisted jet injections. Journal of Controlled Release, 243, 195-203. 10.1016/j.jconrel.2016.10.010
    URL: http://hdl.handle.net/2292/31256
    Other University of Auckland co-authors: Andrew Taberner
  • Williams, R. M., Ruddy, B. P., Hogan, N. C., Hunter, I. W., Nielsen, P. M., & Taberner, A. J. (2016). Analysis of Moving-Coil Actuator Jet Injectors for Viscous Fluids. IEEE Transactions on Biomedical Engineering, 63 (6), 1099-1106. 10.1109/TBME.2015.2482967
    URL: http://hdl.handle.net/2292/29107
    Other University of Auckland co-authors: Poul Nielsen, Andrew Taberner
  • Ruddy, B. P., Mckeage, J. W., Williams, R. M. J., Nielsen, P. M. F., & Taberner, A. J. (2015). A compound ampoule for large-volume controllable jet injection. 37th Annual International Conference of the IEEE Engineering in Medicine and Biology Society (EMBC), 7341-7344. Milan, Italy. 10.1109/EMBC.2015.7320087
    URL: http://hdl.handle.net/2292/27608
    Other University of Auckland co-authors: James Mckeage, Poul Nielsen, Andrew Taberner
  • Johnston, C., Han, J.-C., Ruddy, B., Nielsen, P., & Taberner, A. (2015). A high-resolution thermoelectric module-based calorimeter for measuring the energetics of isolated ventricular trabeculae at body temperature. American Journal of Physiology: Heart and Circulatory Physiology, 309 (2), H318-H324. 10.1152/ajpheart.00194.2015
    URL: http://hdl.handle.net/2292/26745
    Other University of Auckland co-authors: Andrew Taberner, Poul Nielsen, June-Chiew Han
  • Ruddy, B. P., Taberner, A. J., & Boyce-Bacon, J. (2015). Optimization of Linear Permanent Magnet Synchronous Motors for Needle-free Jet Injection. Paper presented at Int Aegean Conference on Electrical Machines and Power Electronics (ACEMP) / Int Conference on Optimization of Electrical and Electronic Equipment (OPTIM) / Int Symposium on Advanced Electromechanical Motion Systems (ELECTROMOTION), Side, TURKEY. 2 September - 4 September 2015. 2015 INTL AEGEAN CONFERENCE ON ELECTRICAL MACHINES & POWER ELECTRONICS (ACEMP), 2015 INTL CONFERENCE ON OPTIMIZATION OF ELECTRICAL & ELECTRONIC EQUIPMENT (OPTIM) & 2015 INTL SYMPOSIUM ON ADVANCED ELECTROMECHANICAL MOTION SYSTEMS (ELECTROMOTION). (pp. 7).
    URL: http://hdl.handle.net/2292/28079
    Other University of Auckland co-authors: Andrew Taberner


Contact details

Primary office location

Level G, Room G07
New Zealand

Web links