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Growth Plate Measurement Device

This group, consisting of Andrea Schnelle, Adam Graf, Rafael Connemara, and Barry Bass, aims to create a precise device for measuring tibia lengthening in lambs without impeding movement or crossing the growth plate. The presentation covers problem statement, product design specifications, methods, drawbacks, alternative designs, and future work.

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Growth Plate Measurement Device

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Presentation Transcript

  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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