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Steel Bar Final Presentation MAE 435

Steel Bar Final Presentation MAE 435. Maureen Loughran Gregory Ragosta Christina Felarca Adham Sohby. Objective. To develop a steel bar prototype that will allow doctors to know the appropriate time to remove the bar from the patient

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Steel Bar Final Presentation MAE 435

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  1. Steel BarFinal PresentationMAE 435 Maureen Loughran Gregory Ragosta Christina Felarca AdhamSohby

  2. Objective • To develop a steel bar prototype that will allow doctors to know the appropriate time to remove the bar from the patient • Prevents chest wall from regressing back to its original state • Real Proof of Concept prototype and Ideal Model • Have the ability to gather this information outside of the body, wirelessly, to provide the least amount of discomfort for the patient.

  3. OverviewPectus Excavatum • Deformity of the chest and ribs • Commonly treated by the Nuss Procedure • 4% of PE patients must undergo the surgery again due to premature removal of bar 16-Year Old Boy With Severe PectusExcavatum

  4. Overview cont’d Radio Frequency Identification (RFID) • Miniature device that can wirelessly transfer data from a RFID reader • Takes in a radio signal and transmits back out the stored information on the tag • Semi-passive RFID Wireless Identification and Sensing Platform (WISP) • Developed by Intel • Powered solely by RF absorbed by antenna Wisp Functional Diagram

  5. Overview cont’dIntel Strain Gauge Solution • Strain gauge PCB has to be built to interface WISP with strain • Wheatstone Bridge • Amplifier

  6. Our Solution • Real Proof of Concept Model • Place 1 strain gauge on the surface of the bar • Using Intel’s strain gauge solution, we can connect the strain gauges to the WISP via a Wheatstone bridge and amplifier • The WISP will interface with the reader (outside of the patient) and report the data using WISP’s reader software • Ideal Model • Ideal model will have 2 strain gauges with all the components built into the bar itself (to cancel noise and tension/compression)

  7. Theoretical Design • AutoCAD model

  8. Theoretical Design

  9. Equipment Setup • Stainless Steel Bar (9 in.) • E=192 Gpa, v=0.265 • Impinj Speedway 1000 RFID Reader • Antenna (900-925 MHz) • Strain Gauge • WISP

  10. Equipment Setup cont’d

  11. Assembly of Prototype Board • Strain Gauge Printed Circuit Board (SGPCB)

  12. Assembly of Prototype Board cont’d

  13. Assembly of Prototype Board cont’d

  14. Wheatstone Bridge and Amplifier Assembly of Prototype Board cont’d

  15. WISP Software [ 1 byte | tag type] + [ 8 bytes | data] + [ 1 byte | WISP HW Version] + [ 2 bytes | HW Serial #] [11]

  16. Fig. 13 WISP with leads for Vin, Vout, and Ground Experimental Results

  17. Experimental Results 1 2 3 4

  18. Limitations and Obstacles • Limited time • Limited knowledge of electronic components and code • Hardware limitations • Comparison of results virtual and experimental

  19. Future Work

  20. Cost Analysis

  21. Gantt Chart

  22. Questions?

  23. [1] Medscape. 1000722-1004953-746.jpg. [2] (2012, Diseases & Conditions: Pectus Excavatum. 2012(2012/12/05). Available: http://my.clevelandclinic.org/disorders/pectus_excavatum/hic_pectus_excavatum.aspx [3] (2012, 2012/12/2). Adult Pectus Excavatum. Available: http://www.cardiothoracicsurgery.wustl.edu/patientcare/pectusexcavatum.asp [4] (2009, 2012/12/02). Pectus Excavatum Exercise Program. [5] (2012, Pectus Excavatum. Thoracic Diseases & Disorders at Columbia University Medical Center(2012/12/2). Available: http://www.seattlechildrens.org/medical-conditions/bone-joint-muscle-conditions/pectus-excavatum-symptoms/ [6] 2012/12/02). Our Pediatric Surgeons. Available: http://www.chkd.org/Services/Nussprocedure/Surgeons.aspx [7] K. R. J. Redlinger RE Jr, Nuss D, Kuhn MA, Obermeyer RJ, Goretsky MJ. (2011, One hundred patients with recurrent pectus excavatum repaired via the minimally invasive Nuss technique--effective in most regardless of initial operative approach. Available: http://www.ncbi.nlm.nih.gov/pubmed/21683218 [8] M. Roberti. (2012, What Is a Semi-passive RFID Tag? RFID Journal. Available: http://www.rfidjournal.com/article/view/8117 [9] (2010, WISP: Wireless Identification and Sensing Platform. Available: http://www.seattle.intel-research.net/WISP/ [10] P. F. Federico Gasco, Jeff Braun, Joshua Smith, Patrick Stickler, Luciano DeOto. (2011, Wireless Strain Measurement for Structural Testing and Health Monitoring of Carbon Fiber Composites. Available: http://wisp.wikispaces.com/file/view/Gasco_2011_JCOMA.pdf/259732728/Gasco_2011_JCOMA.pdf [11] P. Powledge. (2009). Working with WISP Firmware. Available: http://wisp.wikispaces.com/Working+with+WISP+firmware References

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