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Capacitive Touch Sensor for
Foot Drop Paralysis Stimulator
Apivan Trungtrakul, Jirawat Jitprasutwit, Ratikorn Chaivattanatham
               Advisor: Zeng Lertmanorat, Ph.D.




           THAILAND, Mahidol University
             iCAN 2011 Beijing China
Foot drop




@Faculty of Physical Therapy, Mahidol University
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
In Thailand
At less 400,000 Foot Drop
Treatments
• Tendon transfer (surgery)
• Ankle foot orthotic (joint support)




           Tendon transfer              Ankle foot orthotic
Electrotherapy:
                Foot drop stimulator (FDS)

     Sensor part



     Control part


Electrical stimulator part




     Nerve & Muscle

 Contraction!!!
FDS in commercial
    Force sensor                    Tilt sensor




Odstock   Bioness L300   WalkAide         XFT Electronic
Europe        USA          USA                     China
1,700 $      6,500 $      4,495 $                 1,380 $
Our sensor
Capacitive technique
Simple calculation
Sensor benchmark


                           Tilt sensor   Force sensor   Cap. sensor

 Power consumption

      Durability

         Cost

      Reliability

Extra electronic circuit

       SCORE                  -1             -1              3
FDS system & accessory

   Controller               Capacitive
       &                     sensor
   stimulator




                                         Set parameter via software

                Electrode




        FDS system
Commercial FDS


    WalkUp FDS
 1 adjustable knob
 2 interface buttons
 3 stimulation modes


 300 – 400 USD (Thailand only)
Clinical Trial
Summary

New Sensing Technique
Capacitive touch sensor

Low Power Consumption
       2.75 nA

   High durability
  PCB-based Sensor

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"iCAN'2011" 4-7 Jun 2011 @Beijing,China