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IE 552 Mechanics of Musculoskeletal System Dr. Andris Freivalds Class #30

IE 552 Mechanics of Musculoskeletal System Dr. Andris Freivalds Class #30. Ch. 7 – Instrumentation. Need instrumentation or data collection Must meet certain criteria: Validity – measurement matches function Reliability – accurate and repeatable Distinguish between normal/abnormal

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IE 552 Mechanics of Musculoskeletal System Dr. Andris Freivalds Class #30

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  1. IE 552 Mechanics of Musculoskeletal System Dr. Andris Freivalds Class #30 IE 552

  2. Ch. 7 – Instrumentation • Need instrumentation or data collection • Must meet certain criteria: • Validity – measurement matches function • Reliability – accurate and repeatable • Distinguish between normal/abnormal • Not alter function measured (Hawthorne) • Safe to use • Simple, portable, cheap IE 552

  3. Wrist/Finger Motion Measurement IE 552

  4. Flexible Goniometers IE 552

  5. Static Calibration IE 552

  6. Dynamic Calibration IE 552

  7. Pressure & Force Distribution • Inked paper • Thermal paper • Hydraulic sensors • Optical systems • Flexible capacitors • Force sensing resistors • 2 layers conductive film • Spacer is compressed IE 552

  8. Force Sensing Resistors • Force sensing problems → dome cap • Force vs. pressure measurement • Flexibility and bending → errors • Sensor decay, log transformation IE 552

  9. Pressure Measurement IE 552

  10. FSR Applications: • Seat pan pressure • Hand tool grip IE 552

  11. Integrated Touch Glove IE 552

  12. Touch Glove Applications Hand Tool Grip Windshield Handling IE 552

  13. Finger Joint Angles As Function of Grip Dia. IE 552

  14. Finger Forces As Function of Grip Dia. IE 552

  15. Nerve Conduction Measurement IE 552

  16. Electrode Placement (Median Nerve) Sensory (antidromic) Motor (orthodromic) IE 552

  17. Nerve Conduction Waveform IE 552

  18. Changes Over Time Onset Latency Nerve Conduction Velocity IE 552

  19. Limitations of Nerve Conduction • Individual variations • Temperature –NCV ↓ as Temp↓ • Age effect – NCV ↓ as age ↓ • BMI (gender) effect IE 552

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