Neck ExtenderFlexor for Fluoroscopy Examination Client Victor Haughton

Overview • • • 2/5/2022 Problem Statement Background Information Product Design Specifications Design Alternatives

Problem Statement • Create neck positioner for use in fluoroscopy • Accommodate comatose patient

Background Information • Cervical Spine – Determine disk health through neck movement • Fluoroscopy

Product Design Specifications • Must not induce neck injuries • Motorized to prevent human

Motor & Gear Design • Bi-directional motor runs minor gear • Minor gear rotates

Motor & Gear Design Pros Cons • Easy assembly • • No obstruction for

Gear Actuator Design • Motorized worm gear controls shaft elevation • Pins stabilize shaft,

Gear Actuator Design Pros Cons • Easy assembly • Frame limits lower • No

Linear Actuator Design • S-shaped board on table • Movement from actuator • Speed

Linear Actuator Design Pros • Easily constructed • No obstruction of lateral imaging •

Design Matrix Criteria Gear and Motor Safety 30 25 27 22 Feasibility 40 39

Future Work • Research linear actuators/power supplies – How to modify linear actuators •

Acknowledgements • Professor Block, Department of Biomedical Engineering • Professor Fronczak, Department of Mechanical

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Neck Extender/Flexor for Fluoroscopy Examination Client: Victor Haughton, M. D. Advisor: Naomi Chesler, Ph. D. Alison Boumeester Vidhya Raju Susan Samreth Peter Strohm 2/5/2022 1

Overview • • • 2/5/2022 Problem Statement Background Information Product Design Specifications Design Alternatives Decision Matrix Future Work 2

Problem Statement • Create neck positioner for use in fluoroscopy • Accommodate comatose patient http: //www. massgeneralimaging. org http: //www. medi-fax. com 2/5/2022 3

Background Information • Cervical Spine – Determine disk health through neck movement • Fluoroscopy – X-ray imaging in motion – Metal not desirable in imaging areas • Non-motorized device created Spring 2006 2/5/2022 http: //homepages. cae. wisc. edu/~bme 402/ neck_positioner_s 06/ 4

Product Design Specifications • Must not induce neck injuries • Motorized to prevent human error • Simulate natural neck movement • Extension/flexion to 45˚ from neutral • Rate of rotation 1˚/sec • Remote control operation 2/5/2022 Neck Extension www. rad. washington. edu Neck Flexion 5

Motor & Gear Design • Bi-directional motor runs minor gear • Minor gear rotates planetary gear guide • Extension/ flexion centered about axis 2/5/2022 6

Motor & Gear Design Pros Cons • Easy assembly • • No obstruction for lateral imaging • • Achieves desired range of rotation • Realistic (anatomic) • center of rotation • • Components beneath table Gear must always support head board Limited potential for expanding rotation range Awkward shape Mechanically complex 2/5/2022 7

Gear Actuator Design • Motorized worm gear controls shaft elevation • Pins stabilize shaft, prevent rotation • Head board supported by roller guide 2/5/2022 8

Gear Actuator Design Pros Cons • Easy assembly • Frame limits lower • No obstruction for rotation range lateral imaging • Possible interference • Achieves desired range • Mechanically complex of rotation • Realistic (anatomic) center of rotation • Components beneath table 2/5/2022 9

Linear Actuator Design • S-shaped board on table • Movement from actuator • Speed of rotation altered by adjusting voltage – power supply – AC to DC signal conversion 2/5/2022 10

Linear Actuator Design Pros • Easily constructed • No obstruction of lateral imaging • Achieves desired range of motion • Easily powered 2/5/2022 Cons • Moments will occur at base of actuator • Base of actuator much lower than table • Rotational rate will vary 11

Design Matrix Criteria Gear and Motor Safety 30 25 27 22 Feasibility 40 39 20 25 Aesthetics 10 6 6 9 Mechanics 20 16 15 15 100 86 68 71 Totals 2/5/2022 Linear Worm Weights Actuator Gear 12

Future Work • Research linear actuators/power supplies – How to modify linear actuators • Research materials that will not interfere with radiographic imaging – How to machine these materials • Prototype design 2/5/2022 13

Acknowledgements • Professor Block, Department of Biomedical Engineering • Professor Fronczak, Department of Mechanical Engineering • Professor Ranallo, Department of Radiology 2/5/2022 14

Questions? 2/5/2022 15