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Growth Plate Measurement Device

Growth Plate Measurement Device. Group Members: Andrea Schnelle Adam Graf Rafael Connemara Barry Bass Clients: Norman Wilsman Ellen Leiferman Advisor: Paul Thompson 10/18/02. Presentation Overview.

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Growth Plate Measurement Device

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  1. Growth Plate Measurement Device Group Members: Andrea Schnelle Adam Graf Rafael Connemara Barry Bass Clients: Norman Wilsman Ellen Leiferman Advisor: Paul Thompson 10/18/02

  2. Presentation Overview • Problem Statement • Product Design Specifications • Prior Methods • Drawbacks • Alternative Designs • Future Work • Questions

  3. Problem Statement • Develop a more accurate and physiologically compliant method to measure the longitudinal lengthening of tibia in a lamb

  4. Project Design Specifications • The device must not impede the natural movements of the lamb • Capable of measuring up to 1cm • Accuracy of within 10-20µm per measurement • Ability to produce time intensive sampling rates (every 1-5 minutes) • No elements of the device should span the growth plate

  5. Prior Method: Fluorescent Dying • Dye injected into lamb and picked up by cells in the growth plate • Dye left behind as bone grows • Later a second injection given leaving another line • Growth measured in between 1st and 2nd line of dye

  6. Drawbacks with Fluorescent Dye • Lamb must be killed to get growth measurement • Only one measurement can be taken • Does not produce a rate measurement on a small scale

  7. Current Method: Contact DVRT (Differential Variable Reluctance Transducer) • DVRT implanted over growth plate and as bone grows NiTi alloy core position changes • Changes detected by measuring coils differential reluctance • Gives feedback every 2.5 minutes about daytime, date, position and battery life

  8. Drawbacks with Contact DVRT • Method only gives 3-6 days of accurate data • Scar tissue and immune cell build up disrupts measurements • Noise created when lamb is on its feet • Element spans the growth plate

  9. Design Alternatives • Non-Contact DVRT • Modified Existing Contact DVRT • Engineered Non-Contact Measurement Device

  10. Non - Contact DVRT • Pros • Has <10 µm resolution • Capable of measurement every 2.5 minutes • Has no element spanning the growth plate • Cons • Not capable of measuring 9 mm displacement

  11. Theory • Two coils within the housing form the DVRT’s transmitting and sensing capabilities • A change in displacement causes a change in the signal detected by the sensing coil (Output)

  12. Engineered Non-Contact Measurement Device • Current Research • Applies theory of non-contact DVRT • Involves two inductors • Change in displacement results in a difference in voltage sensed

  13. Future Work • Test to minimize voltage and maximize resolution • Modify the engineered non-contact device to be implantable • Continue looking into modifying the current method for extended use

  14. Questions?

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