A passive, parallel master–slave mechanism is presented for magnetic resonance imaging (MRI)-guided interventions in the pelvis. The mechanism allows a physician to stand outside the MRI scanner while manipulating a needle inside the bore and, unlike a powered robot, does not place actuators in proximity to the patient. The manipulator combines two parallel mechanisms based on the Delta robot architecture. The mechanism also includes a two-axis gimbal to allow for tool angulation, giving a total of five degrees of freedom so that the physician can insert and steer a needle using continuous natural arm and wrist movements, unlike simple needle guides. The need for access between the patient’s legs and within the MRI scanner leads to an unusual asymmetric design in which the sliding prismatic joints form the vertices of an isosceles triangle. Kinematic analysis shows that the dexterity index of this design is improved over the desired workspace, as compared to an equilateral design. The analysis is extended to estimate the effect of friction and model the input:output force transmission. Prototypes, with final dimensions selected for transperineal prostate interventions, showed force transmission behavior as predicted by simulation, and easily withstood maximum forces required for tool insertion.
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March 2015
Research-Article
A Passive Parallel Master–Slave Mechanism for Magnetic Resonance Imaging-Guided Interventions
Santhi Elayaperumal,
Santhi Elayaperumal
Graduate
Mem. ASME
Department of Mechanical Engineering,
e-mail: santhie@stanford.edu
Mem. ASME
Department of Mechanical Engineering,
Stanford University
,Stanford, CA 94305
e-mail: santhie@stanford.edu
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Mark R. Cutkosky,
Mark R. Cutkosky
Professor
Fellow ASME
Department of Mechanical Engineering,
e-mail: cutkosky@stanford.edu
Fellow ASME
Department of Mechanical Engineering,
Stanford University
,Stanford, CA 94305
e-mail: cutkosky@stanford.edu
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Pierre Renaud,
Pierre Renaud
Professor
ICube,
e-mail: pierre.renaud@insa-strasbourg.fr
ICube,
CNRS-INSA-Strasbourg University
,Strasbourg 67000
, France
e-mail: pierre.renaud@insa-strasbourg.fr
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Bruce L. Daniel
Bruce L. Daniel
Search for other works by this author on:
Santhi Elayaperumal
Graduate
Mem. ASME
Department of Mechanical Engineering,
e-mail: santhie@stanford.edu
Mem. ASME
Department of Mechanical Engineering,
Stanford University
,Stanford, CA 94305
e-mail: santhie@stanford.edu
Mark R. Cutkosky
Professor
Fellow ASME
Department of Mechanical Engineering,
e-mail: cutkosky@stanford.edu
Fellow ASME
Department of Mechanical Engineering,
Stanford University
,Stanford, CA 94305
e-mail: cutkosky@stanford.edu
Pierre Renaud
Professor
ICube,
e-mail: pierre.renaud@insa-strasbourg.fr
ICube,
CNRS-INSA-Strasbourg University
,Strasbourg 67000
, France
e-mail: pierre.renaud@insa-strasbourg.fr
Bruce L. Daniel
Manuscript received December 23, 2013; final manuscript received October 12, 2014; published online November 26, 2014. Assoc. Editor: Carl Nelson.
J. Med. Devices. Mar 2015, 9(1): 011008 (11 pages)
Published Online: March 1, 2015
Article history
Received:
December 23, 2013
Revision Received:
October 12, 2014
Online:
November 26, 2014
Citation
Elayaperumal, S., Cutkosky, M. R., Renaud, P., and Daniel, B. L. (March 1, 2015). "A Passive Parallel Master–Slave Mechanism for Magnetic Resonance Imaging-Guided Interventions." ASME. J. Med. Devices. March 2015; 9(1): 011008. https://doi.org/10.1115/1.4028944
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