Transcript Stead-Ease - Columbia University

Stead-Ease
BME Senior Design
Midterm Presentation
October 22, 2009
Andrea Castaneda - Daniel Miranda - Jennifer Wang - Kevin Yeroushalmi - Joseph Youssef
Project Advisor: Clark Hung
Course Advisors: Elizabeth Hillman – Keith Yeager – Lauren Grosberg
Products
Constraints &
Specifications
Ideas
• 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
Introduction
Introduction
Summary
Activation
Frequency
10-12 Hz
Associated Disorder/Disease
Movement
Essential Tremor
Intention
Target- directed 2-5 Hz
movement
Multiple Sclerosis
Essential 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 &
Specifications
“Essential”
Products
Type
Introduction
Tremors
Ideas
Summary
Pros
Cons
Therapies
Non-invasive
~$150 pppy for PD
Loss of effectiveness over time
Induced 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
Deep Brain
Stimulation
Adjustable stimulation
Targets electrical signals in
specific areas of the brain
Invasive surgery
~ $150,000
Plasma
Exchange
Removes antibodies that
destroy myelin
Infection
Blood clotting
Ideas
Procedures
Constraints &
Specifications
Drug Therapy
Products
Treatment
Introduction
Available Treatments
Summary
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
Ideas
•
Constraints &
Specifications
Multiple Sclerosis (MS) and Essential Tremor (ET) cause intention
tremors
Products
•
Introduction
Design Problem
Summary
•
Temporary attachment to user
Constraints &
Specifications
• Assist patient in eating, writing, and transporting objects
Products
• Detection and dampening of unwanted motion in the forearm
and/or wrist
Introduction
Design Brief
• Inconspicuous design to avoid public attention
Ideas
Summary
Introduction
Assistive Devices
Products
Constraints &
Specifications
Ideas
Summary
Cons
Focus on three
regions for
complete
tremor analysis
and dampening
Bulky and
unsightly which
causes patient
embarrassment
Ideas
~850 g
Will further
fatigue arm and
tremor could
increase from
overexertion
Constraints &
Specifications
Feedback allows
for specific
control
Products
Pros
Introduction
Products that Reduce Tremors
Summary
Does not have
feedback input to
adjust to
different tremors
Relatively small
and coverable
Might cause pain
due to stiff wrist
design
Ideas
Distal tremor
suppression
good for task
specific devices
Products
Cons
Constraints &
Specifications
Pros
Introduction
Products that Reduce Tremors
Summary
Cons
Adjustable
resistance in
dashpots
Dampening is 2D
and does not
occur laterally
Ideas
Finger piece
obstructive in
completing tasks
device is
intended for
Constraints &
Specifications
Use of viscous
fluid for
resistance to
tremor
Products
Pros
Introduction
Products that Reduce Tremors
Summary
– Selective tremor reduction
– Must not inhibit range of motion
– Must not be bulky
• Safety
Ideas
– Must be easy to use, adjust and remove device
– Should not injure or harm the user in any way
Constraints &
Specifications
• Aesthetics
Products
• Functionality
Introduction
Design Constraints
Summary
– Elasticity for adjusting degree of control/ dampening
Products
• Functionality
Introduction
Design Specifications
• Aesthetics
• Safety
Constraints &
Specifications
– Will be lightweight
– Inconspicuous, form-fitting device
– Nontoxic, hypoallergenic, noncarcinogenic, non- latex materials
Ideas
Summary
Introduction
Idea 1
Products
Bead Sleeve
Linear Accelerometer
Actuators
Constraints &
Specifications
Leads
Chains of metal beads
Ideas
Battery
Thin, light, breathable material
Summary
Form- fitting sleeve
Linear Accelerometer
Products
Magneto-Rheological Fluid Sleeve
Introduction
Idea 2
Leads
Magneto-Rheological (MR) Fluid
Constraints &
Specifications
Actuators
Metal coils for magnetic field
Ideas
Battery
Thin, light, breathable material
Form- fitting sleeve
Summary
Introduction
Idea 3
Products
Arm-Tray Clamp
System attached to surface with a
clamp
Constraints &
Specifications
Series of segments and joints
connected by springs
Arm tray attached to system
Adjustable threshold, air- filled
dashpot
Summary
Spring coupled with dashpot
Ideas
Adjustable elastic bands around
arm tray
Summary
– Paul Greene, MD
– Joseph Mayer, MD
Ideas
• Professional Consultants:
Constraints &
Specifications
– Elizabeth Hillman
– Keith Yeager
– Lauren Grosberg
Products
• Faculty Advisor: Clark Hung
• Course Advisors:
Introduction
Acknowledgements
Introduction
Website
Products
Constraints &
Specifications
Ideas
Summary