Technical Brief

Development of an MRI-Compatible, Compact, Rotary-Linear Piezoworm Actuator

[+] Author and Article Information
Khaled El Bannan

Department of Mechanical and Materials Engineering,
University of Western Ontario,
London, ON N6A 5B9, Canada

Blaine A. Chronik

Department of Physics and Astronomy,
University of Western Ontario,
London, ON N6A 5B9, Canada

Shaun P. Salisbury

Department of Mechanical and Materials Engineering,
University of Western Ontario,
London, ON N6A 5B9, Canada
e-mail: ssalisb2@uwo.ca

1Corresponding author.

Manuscript received November 19, 2013; final manuscript received October 15, 2014; published online November 14, 2014. Assoc. Editor: Carl Nelson.

J. Med. Devices 9(1), 014501 (Mar 01, 2015) (7 pages) Paper No: MED-13-1278; doi: 10.1115/1.4028943 History: Received November 19, 2013; Revised October 15, 2014; Online November 14, 2014

A piezoelectric actuator was developed to operate safely deep inside the magnetic resonance imaging (MRI) machine bore. It is based on novel design that produces linear and rotary motion simultaneously increasing the accuracy of medical needle insertion procedures. The actuation method is based on the piezoworm principle, minimizing the actuator size, maximizing output force, and permitting micrometer scale insertion accuracy. Beryllium copper with high stiffness and strength was used in constructing the actuator to minimize image distortion and to achieve the targeted performance. Performance tests were performed by controlling the frequency input and observing the effect on speed, force and torque. The device achieved a linear speed of 5.4 mm/s and a rotary speed of 10.5 rpm.

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Fig. 1

Actuator model assembled and exploded view

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Fig. 2

Linear step sequence

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Fig. 4

(a) Setup for testing the force capacity and (b) setup for torque capacity

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Fig. 5

No load speed versus frequency (theory and experiment forward motion)

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Fig. 6

No load rotary speed versus frequency (theory and experimental)

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Fig. 3

Rotary step sequence




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