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Micro-Technologies for Implantable Strain Gauge Arrays. Anais Sahabian William C. Tang Gloria Yang. Implantable Bone Strain Gauges. Advantages: Better understanding of types of strain bones undergo when affected by conditions such as osteoporosis or a tumor

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micro technologies for implantable strain gauge arrays

Micro-Technologies for Implantable Strain Gauge Arrays

Anais Sahabian

William C. Tang

Gloria Yang

implantable bone strain gauges
Implantable Bone Strain Gauges

Advantages:

  • Better understanding of types of strain bones undergo when affected by conditions such as osteoporosis or a tumor
  • Better understanding of the musculoskeletal system
  • Help create better orthopedic implants
fabrication of parylene based strain gauge
Fabrication of Parylene-Based Strain Gauge

Taken from “Parylene-Based Strain Sensors for Bone”

Taken from “Parylene-Based Strain Sensors for Bone”

results
Results
  • The results were used as a qualitative analysis as opposed to a quantitative one. The simulation could not be done using the actual size of the device because of the lack of memory needed to compute the solutions.
  • In the real strain gauge, the gold is actually 9 times thinner and the current applied is magnitudes smaller. This means that the strain gauge will only slightly increase in temperature and the tissue and bone surrounding the parylene C will not feel the heat from the gold strain gauge.
polypyrrole deposition
Polypyrrole Deposition
  • Polypyrrole (PPy) is a naturally conductive polymer
  • Its conductivity changes with strain
  • Goal: To understand PPy properties so we can make a strain gauge using polypyrrole as the sensing mechanism
ppy deposition setup
PPy Deposition Setup

Reference Electrode

Silicon Wafer

Counter Electrode

preliminary results
Preliminary Results
  • After measuring the thicknesses of the PPy-coated wafers a correlation can be seen between amount of current applied and the thickness of the wafer.
  • Specifically, as the current increases the thickness of PPy deposited onto the wafer increases.
  • This correlation must be tested further to better understand exactly what currents give rise to certain thickness.
carbon black doped pdms
Carbon Black Doped PDMS
  • PDMS is not naturally conductive, while carbon black is.
  • When the two are mixed together the PDMS becomes conductive.
  • This is useful because it can be used as the sensing mechanism in strain gauges.
compression tests
Compression Tests
  • A compression device was created to test the conductive properties of carbon black doped PDMS
preliminary results16
Preliminary Results
  • As expected, when strain increases, the resistance of the PDMS decreases.
  • This shows that carbon black doped PDMS is sensitive enough to be used in a strain gauge.
  • The PDMS piece might become deformed after the first cycle, which would explain the decrease in resistance after each cycle.
future work
Future Work
  • Characterize PPy deposition parameters and resistivity change with strain.
  • Conduct compression tests to characterize carbon black doped PDMS.
acknowledgements
Acknowledgements
  • National Science Foundation and UROP
  • Prof. William C. Tang
  • Gloria Yang
  • IM-SURE Fellows
  • Said Shokair