Otologic Surgical Drills Julianna Ianni Meher Juttukonda David Morris Advisor Dr Jadrien Young MD What is Otologic Surgery Surgery of the ear Mastoidectomy Mastoid airfilled spaces behind the ear ID: 631631
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Ultrasound Imaging Capability for Otologic Surgical Drills
Julianna IanniMeher JuttukondaDavid MorrisAdvisor: Dr. Jadrien Young, M.D.Slide2
What is Otologic Surgery?
Surgery of the earMastoidectomyMastoidair-filled spaces behind the earSurgery to remove cells from the mastoidUses to treat anti-biotic resistant infections in the regionto insert a cochlear implant30,000 to 60,000 performed annually in the U.S.1Slide3
Anatomy of the EarSlide4
ObjectivesTo find an ultrasound transducer that is compatible with an
otologic drillTo calculate the thickness of the mastoid bone using A-mode USTo shut off the drill when the bone has been drilledSlide5
Why Ultrasound?
CategoryCT - MethodUltrasoundSafetyIonizing RadiationNo Ionizing Radiation
Real-time Data
Time
Drilling
Platform
Not necessary
Invasiveness
Invasive
Non-invasiveSlide6
Past Work
Studied ultrasound equipment in order to determine the most effective way to produce accurate imagesResearched the best transducer frequency for imaging that region of the skullMet with Dr. Young and discussed the surgical aspects required to have a usable drillRead several papers and technical documentation regarding the operation of ultrasound surgical imaging technologyDeveloped
the website
Updated list
of design goals
Observed
use of
otologic
drills & identify design constraints
Identified
potential design obstacles
Generated design
ideas concerning mechanism of attachment
Restructured design goals focusing more on finding an ultrasound transducer compatible with an otologic drillSlide7
Current workFinding company that can build hollow annular transducer to specifications
Performing measurements w/larger transducer on material samples analogous to skull boneResearching renting a ultrasound depth gauge to test on cadaver bone for proof of conceptSlide8
Simulation of Signal
AssumptionsSpeed of Sound in Skull Bone = 2700 m/s3Only Reflection/Transmission & AttenuationNo ScatteringResultsSlide9
Solidworks Prototype
Side ViewTop ViewBottom ViewSlide10
Future Work
Deciding type & shape of ultrasound transducerDetermine ideal frequencyDeveloping method to connect to current power sourceDeveloping cooling systemDeveloping a B-Mode to image the path and Doppler mode to measure blood flow
Building & testing prototypeSlide11
References1. French, LC et al. “An estimate of the number of
mastoidectomy procedures performed annually in the United States”. Ear Nose Throat J. 2008 May; 87(5): 267-70.2. Ear Anatomy: http://www.umm.edu/imagepages/1092.htm3. Clement, GT et. Al. “Correlation of Ultrasound Phase with Physical Skull Properties”. Ultrasound in Medicine & Biology. 2002 May; 28(5): 617-624.