Your SlideShare is downloading. ×
0
Measurement of Ankle Supination Torque
Measurement of Ankle Supination Torque
Measurement of Ankle Supination Torque
Measurement of Ankle Supination Torque
Measurement of Ankle Supination Torque
Measurement of Ankle Supination Torque
Measurement of Ankle Supination Torque
Measurement of Ankle Supination Torque
Measurement of Ankle Supination Torque
Measurement of Ankle Supination Torque
Measurement of Ankle Supination Torque
Measurement of Ankle Supination Torque
Measurement of Ankle Supination Torque
Measurement of Ankle Supination Torque
Measurement of Ankle Supination Torque
Measurement of Ankle Supination Torque
Measurement of Ankle Supination Torque
Measurement of Ankle Supination Torque
Upcoming SlideShare
Loading in...5
×

Thanks for flagging this SlideShare!

Oops! An error has occurred.

×
Saving this for later? Get the SlideShare app to save on your phone or tablet. Read anywhere, anytime – even offline.
Text the download link to your phone
Standard text messaging rates apply

Measurement of Ankle Supination Torque

729

Published on

Final presentation of the final year project. The presentation illustrates the vision of the project, its scope and the experimental design incorporated to obtain the final result, Medical Devices. …

Final presentation of the final year project. The presentation illustrates the vision of the project, its scope and the experimental design incorporated to obtain the final result, Medical Devices.

Ankle Supination Torque is a very important indicator for any abnormal forces being exerted on the ankle due to improper training practices or faulty designs of footwear. The findings of this study, which included four human subjects, can be used for early detection of ankle anomaly and hence prevention of further damage of the joint.

Published in: Education
0 Comments
0 Likes
Statistics
Notes
  • Be the first to comment

  • Be the first to like this

No Downloads
Views
Total Views
729
On Slideshare
0
From Embeds
0
Number of Embeds
0
Actions
Shares
0
Downloads
6
Comments
0
Likes
0
Embeds 0
No embeds

Report content
Flagged as inappropriate Flag as inappropriate
Flag as inappropriate

Select your reason for flagging this presentation as inappropriate.

Cancel
No notes for slide

Transcript

  1. MEASUREMENT OF ANKLE SUPINATION TORQUESubmitted By: Guide: ASHOK KUMAR GUPTA CHAITANYA SRINIVAS (07BMD012) L.V. MANISH KUMAR ASSISTANT PROFESSOR (07BMD025) BIO-MEDICAL DIVISION ROOPAM DEY Room No: 107, CBMR. (07BMD047)Place Of Work: VELLORE INSTITUTE OF TECHNOLOGY, VELLORE.
  2. INTRODUCTION 1The objective of this project was to calculate the Ankle SupinationTorque by converting the pressure applied by the foot into electricalsignal.Ankle supination points the muscleweight of the body outside the footand hence high arch of supinationcan cause Achilles tendonitis,Peroneal tendonitis, Ankle sprains.Though there are clear symptoms ofhigher degree of ankle supinationbut there is hardly any sign Fig 1 – Supination Posture of a footfor minor damage in an ankle leading to supination. Hence thisproject aims to be very simple and sensitive, the results can be usedas a feedback system for training athletes.
  3. PREPARATION 2The overview of this project was taken from the work done by theChinese scientists Daniel Tik-Pui Fong et al[2].The sensors used by us are Force Sensing Resistors (FSR),manufactured by Interlink Electronics. The work done by Indianscientist Dr. N.K. Rana of RGIT[1] helped us to work with thesensors.A thorough study of FSR[4]was done that helped us to narrow downto a voltage-divider circuit using LM 324.The manual of National Instruments on Lab VIEW AnalysisConcepts[8] gave us the basic idea of signal processing and analysisin Lab VIEW.Introduction to Data AcQuisition[9] is the tutorial of NationalInstruments that gives the overview of the DAQ and its functions.
  4. METHODOLOGY 3Fig 2 – FSRs attached to the In-Sole Fig 3 – Voltage dividing circuit for a single FSRFig 5 – The Visual Basic GUI Main Frame Fig 4 – PIC Microcontroller Circuit
  5. 3-PS SYSTEM 4 Sensor Locations : S-60 : Second/Third Distal Phalange S-72 : Third Metatarsalphalangeal Joint Fig 9 - FSR S-98 : Fourth/Fifth Metatarsalphalangeal Joint SupT (Nm)= -2.068+0.00190827*e^0.01252 (1023-S60) +0.002763846 *e^0.01252 (1023-S72) + +0.003248253*e^ 0.01252(1023-S98)….1 Fig 7 – Linear increase in the ADC outputFig 6 – Sole Divisions with increase in output voltage. Fig 8 – Sensor Points
  6. FORCE SENSOR RESISTOR (FSR) 5 Sensor Characteristics :1. Resistance inversely proportional to applied pressure.2. Can withstand 1000N of force. Resistance stabilizes above this point.3. Gives a resistance of 0.25KΩ at 100N and 1.25KΩ at 10N.4. Size used 0.5” diameter model 402.5. Lifetime of the sensor is >10 million actuations.6. Temperature Range is -30°C to 170°C. Fig 10 – The Internal Structure of a FSR Fig 11 – Output Characteristics of FSR
  7. VOLTAGE DIVIDER CIRCUIT 6 a bFig 12 – (a)The theoretical design and (b) the practical output of Voltage Divider Circuit Vout = Vin * [1 / (1 + Rfsr / Rm ) ]To convert the pressure of the foot into voltage a voltage dividercircuit was implemented. The above given formula was used.5V was used as the Vin.
  8. 7 a bFig 13 – (a) Outputs using different Rm values (b) Perfect linearity observed by using 8.2KΩ with Rfsr being 0.25KΩ. Rm is the resistor applied in series with the Rfsr to divide the input voltage. In this project 8.2KΩ was used as Rm. The output of the circuit was given to LM324, a linear quad-op amp that accepts PnP inputs, that reduces the noise of the converted signal.
  9. 8PRACTICAL OUTPUT OF VOLTAGE DIVIDER CIRCUIT Fig 14 – Output of the Voltage Divider Circuit Fig 15 – Graphical Output
  10. DATA ACQUISITION KIT 9Fig 16 – The interfacing of the Voltage Divider Circuit with the Data AcQuisition (DAQ).Main function of this block is to sample, analog to digital conversionand digital analog conversion.The signal was sampled at 500 Hz and 1000 samples were taken thatgave us one sample in 2 milliseconds.
  11. WORK DONE IN Lab VIEW 10Fig 15 – The Block Diagram designed in Lab VIEW to calculate and store the values of Ankle Supination Torque
  12. 11Fig 16 – The VI designed in Lab VIEW to display the calculated values of Individual Sensors and Ankle Supination Torque
  13. FINAL RESULTS 12Fig 17– Averaged Ankle Supination Torque sensed from 4 different subjects during normal walking and controlled supination walking
  14. 13 a b cFig 18 – Output of each sensors during supination walking and normal walking (a) S 60, (b) S72 and (c) S 98.
  15. CONCLUSION 14 This work was successful in calculating the ankle supination torque in real time, while the subject walksAn increase in the ankle supination torque was observed when thesubject walked in the controlled supinated way. The average specificincrease being 158.6585 N-mThese values can be further used to find out the exact threshold ofankle supination torque that an ankle can withstand. This will helpin safe training of the athletes.In future a wireless devices can be made to calculate the supinationtorque which will be a boon to the sports world.
  16. PROBLEMS FACED 15Availability of FSR with desired dimensions in low cost Status- Solved (Purchased the sensors from Chennai)To get the best sensitivity of the voltage divider circuit to get a linearoutput. Status- Solved (Tried and tested the circuit with several resistors and incorporated 8.2K)Implementation of hardware for calculating ankle supination torqueby serial communication using microcontroller Status- Partially solved in simulation.
  17. REFERENCES 16[1] Application of Force Sensing Resistor (FSR) in Design of Pressure Scanning System forPlantar Pressure Measurement By: Dr. N. K. Rana, Department of Instrumentation Engineering, Rajiv Gandhi Institute ofTechnology[2] A three-pressure-sensor (3PS) system for monitoring ankle supination torque during sportmotionsBy: Daniel Tik-Pui Fong, Yue-Yan Chan, Youlian Hong, Patrick Shu-Hang Yung, Kwai-YauFung, Kai-Ming Chan[3] LM 324 DatasheetBy- Phillips Electronics[4] FSR an Overview of the technologyBy- Tech Storm Inc[5] MAX 232 DatasheetBy- Texas Instruments[6] PIC 16F873 DatasheetBy- Microchip[7] 3-Terminal 1A Positive Voltage RegulatorBy- FAIRCHILD SEMICONDUCTORS[8] Lab VIEW Analysis and ConceptsBy- National Instruments[9] Introduction to Data AcquisitionBy- National Instruments
  18. THANK YOU

×