"iCAN'2011" 4-7 Jun 2011 @Beijing,China
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Transcript of "iCAN'2011" 4-7 Jun 2011 @Beijing,China
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Capacitive Touch Sensor for Foot Drop Paralysis Stimulator
THAILAND, Mahidol University
iCAN 2011 Beijing China
Apivan Trungtrakul, Jirawat Jitprasutwit, Ratikorn Chaivattanatham
Advisor: Zeng Lertmanorat, Ph.D.
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Foot drop
@Faculty of Physical Therapy, Mahidol University
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Cause of foot drop
Stroke
20% of survivors
They have foot drop.
Every year
15 million people suffer a stroke
5 million are left permanently disable
1 million Foot Drop per year
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In Thailand
At less 400,000 Foot Drop
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Treatments
• Tendon transfer (surgery)
• Ankle foot orthotic (joint support)
Tendon transfer Ankle foot orthotic
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Electrotherapy: Foot drop stimulator (FDS)
Sensor part
Electrical stimulator part
Control part
Nerve & Muscle
Contraction!!!
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FDS in commercial
OdstockEurope
1,700 $
Bioness L300USA
6,500 $
Force sensor
WalkAideUSA
4,495 $
XFT ElectronicChina
1,380 $
Tilt sensor
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Our sensor
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Capacitive technique
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Simple calculation
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Sensor benchmark
Power consumption
Durability
Cost
Reliability
Extra electronic circuit
SCORE -1 -1 3
Tilt sensor Force sensor Cap. sensor
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FDS system & accessory
Capacitive
sensor
FDS system
Electrode
Controller
&
stimulator
Set parameter via software
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Commercial FDS
300 – 400 USD (Thailand only)
1 adjustable knob
2 interface buttons
3 stimulation modes
WalkUp FDS
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Clinical Trial
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Summary
New Sensing Technique Capacitive touch sensor
Low Power Consumption 2.75 nA
High durabilityPCB-based Sensor