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Stead-EaseBME Senior Design
Midterm PresentationOctober 22, 2009
Andrea Castaneda - Daniel Miranda - Jennifer Wang - Kevin Yeroushalmi - Joseph YoussefProject Advisor: Clark Hung
Course Advisors: Elizabeth Hillman – Keith Yeager – Lauren Grosberg
IntroductionConstraints &
Specifications
Summ
aryIntroduction
ProductsIdeas
• In the US, Multiple Sclerosis (MS) affects approximately 400,000 people, primarily people between the ages of 20 and 40
• In the US, Parkinson’s Disease (PD) affects approximately 550,000 people, primarily people over the age of 40
• In the US, Essential Tremor (ET), the most common movement disorder, affects approximately 1.5 million people, primarily people over the age of 40
TremorsType Activation Frequency Associated Disorder/Disease
“Essential” Movement 10-12 Hz Essential Tremor
Intention Target- directed movement
2-5 Hz Multiple SclerosisEssential Tremor
Postural Counter-gravity position
8-12 Hz Essential Tremor
Resting Relaxation 3-7 Hz Parkinson’s Disease
Physiological None 8-12 Hz None
Constraints &
SpecificationsSum
mary
IntroductionProducts
Ideas
Available TreatmentsTreatment Pros Cons
Therapies
Drug Therapy Non-invasive~$150 pppy for PD
Loss of effectiveness over timeInduced motor complications~$40,000 pppy for MS
Physical Therapy
Maintains range of motion and flexibility
Cannot cure symptoms or diseases
Occupational Therapy
Adjusts to individual lifestyles Does not address the actual problem
Procedures
Deep Brain Stimulation
Adjustable stimulationTargets electrical signals in specific areas of the brain
Invasive surgery~ $150,000
Plasma Exchange
Removes antibodies that destroy myelin
InfectionBlood clotting
Constraints &
SpecificationsSum
mary
IntroductionProducts
Ideas
Design Problem• Multiple Sclerosis (MS) and Essential Tremor (ET) cause intention
tremors
• Assistive devices are commercially available
• Many different methods of treatment are available, but not always appropriate or effective
• Currently, no devices sufficiently reduce tremors and/or guide movement
Constraints &
SpecificationsSum
mary
IntroductionProducts
Ideas
Design Brief• Detection and dampening of unwanted motion in the forearm
and/or wrist
• Assist patient in eating, writing, and transporting objects
• Temporary attachment to user
• Inconspicuous design to avoid public attention
Constraints &
SpecificationsSum
mary
IntroductionProducts
Ideas
Constraints &
SpecificationsSum
mary
IntroductionProducts
Ideas
Assistive Devices
Products that Reduce Tremors
Pros Cons
Feedback allows for specific control
~850 gWill further fatigue arm and tremor could increase from overexertion
Focus on three regions for complete tremor analysis and dampening
Bulky and unsightly which causes patient embarrassment
Constraints &
SpecificationsSum
mary
IntroductionProducts
Ideas
Products that Reduce TremorsConstraints &
Specifications
Summ
aryIntroduction
ProductsIdeas
Pros Cons
Distal tremor suppression good for task specific devices
Does not have feedback input to adjust to different tremors
Relatively small and coverable
Might cause pain due to stiff wrist design
Products that Reduce Tremors
Pros Cons
Use of viscous fluid for resistance to tremor
Finger piece obstructive in completing tasks device is intended for
Adjustable resistance in dashpots
Dampening is 2D and does not occur laterally
Constraints &
SpecificationsSum
mary
IntroductionProducts
Ideas
Design Constraints
• Functionality– Selective tremor reduction– Must not inhibit range of motion
• Aesthetics– Must not be bulky
• Safety– Must be easy to use, adjust and remove device– Should not injure or harm the user in any way
Constraints &
SpecificationsSum
mary
IntroductionProducts
Ideas
Design Specifications
• Functionality– Elasticity for adjusting degree of control/ dampening
• Aesthetics– Will be lightweight– Inconspicuous, form-fitting device
• Safety– Nontoxic, hypoallergenic, noncarcinogenic, non- latex materials
Constraints &
SpecificationsSum
mary
IntroductionProducts
Ideas
Idea 1Constraints &
Specifications
Summ
aryIntroduction
ProductsIdeas
Bead Sleeve
Linear Accelerometer
Leads
Actuators
Chains of metal beads
Battery
Thin, light, breathable material
Form- fitting sleeve
Idea 2Magneto-Rheological Fluid Sleeve
Linear Accelerometer
Leads
Actuators
Magneto-Rheological (MR) Fluid
Metal coils for magnetic field
Battery
Thin, light, breathable material
Form- fitting sleeve
Constraints &
SpecificationsSum
mary
IntroductionProducts
Ideas
Idea 3
Arm-Tray Clamp
System attached to surface with a clamp
Series of segments and joints connected by springs
Arm tray attached to system
Adjustable elastic bands around arm tray
Adjustable threshold, air- filled dashpot
Spring coupled with dashpot
Constraints &
SpecificationsSum
mary
IntroductionProducts
Ideas
Acknowledgements
• Faculty Advisor: Clark Hung• Course Advisors:– Elizabeth Hillman– Keith Yeager– Lauren Grosberg
• Professional Consultants:– Paul Greene, MD– Joseph Mayer, MD
Constraints &
Specifications
Summ
aryIntroduction
ProductsIdeas
WebsiteConstraints &
Specifications
Summ
aryIntroduction
ProductsIdeas