issues of human interface design - stanford universitythe biggest problem with human interface...
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Issues of Human
Interface designGary M. Berke MS, CP, FAAOP
Adjunct Clinical Assistant Professor,
Department of Orthopaedic Surgery
Stanford University
Private Practitioner, Clinical Prosthetics and
Orthotics, Redwood City, CA
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The biggest problem with human interface design is:
HUMANS
Question???Oscar Pistorius puts his Cheetah Legs to the test – 1:15
Oscar Pistorius – The Blade Runner – 3:06
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A prosthesis must fit
intimately enough to
comfortably support the
limb during high loading,
not bother the soft tissues
and bone and transfer
motion from the human to
the device with extreme
efficiency.
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where does the pressure
go????
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While robotics starts with a
task to be completed or a
problem to be solved.
We start with the person,
their goals and their
limitations.
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Given that
everyone is
different, are
there some
generalizations
that can be
made???
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and…. how do we insure the long term
success for the people we are supposed
to help?
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“Moments of Truth” in Interface Human Design
What is a “Moment of Truth”?
Independent but significant and often
overlapping considerations for any device
(or experience) that will interface with a
person.
Failure at any one could destroy the long
term success
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Five C‟s
• Comfort
• Cosmesis
• funCtion
• Cost
• Cool
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Comfort
What makes something comfortable?
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Comfort
Transference of pressure
No “noxious” stimuli (noise, vibration etc)
Heat
Nuisance factor
Weight
Sensitivity of skin or nerve
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Comfort is illusive
What may be “comfortable” one minute
may not be the next…..
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Cosmesis
What is cosmetic?
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Cosmesis
How do we perceive ourselves?
How do changes to our body affect our
perception of cosmesis?
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funCtion
Is it a device that reliably does what it is
intended to do?
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funCtion
Is there a device that can do everything?
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bionic
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cool
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We have a problem with technology
•We always want something new, often without
formal training and WITHOUT QUANTIFIABLE
BENEFIT and on some occasions, causing harm.
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COST
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27 degrees of
freedom arm
controlled by re-
innervated muscle
groups
https://www.youtube.com/watch?v=ddInW6sm7JE#t=41
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The perfect
device is one
that balances
all of the above
for that
individual
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Using the “c‟s”
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There is a 6th „C‟
• CHANGE
• Psychological change
• Physical change
• Yearly
• Monthly
• Daily
• Hourly
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What goes in to provision of a prosthesis??
AKA: What does Gary
do when not hanging
out with us!
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Take home
•Critically evaluate what we do and why.
•We must focus on solving problems, not just creating new devices or techniques that are equal to existing.
•Narrow your goals
•A prosthesis is not just a series of parts
•Just because you have a hammer, doesn't mean everything is a nail
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Thank you
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Why is he standing
like this?
How many of the “C’s” does this meet??
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What is the Cost of 3d printing?
Cost of printer
Cost of assembly
Cost of materials**
Cost of programmer
Software
Electricity**
Cost of on-site provider **
(providing prosthesis,
providing
adjustments/repairs)
Administration costs**
Cost of travel
Cost of shipping
Cost of Repair to printer
Repair/adjustment to
prosthesis (cables, parts etc)**
Facility costs**
5 c‟s???**