1. Maureen Loughran Gregory Ragosta Christina Felarca Adham Sohby

2. What is Pectus Excavatum?  Deformity of the chest and rib cage  Most common in children but also occurs in adults 16-Year Old Boy With Severe Pectus Excavatum

3. The Nuss Procedure  First developed by Dr. Donald Nuss, a pediatric surgeon at CHKD  Stainless steel/titanium bar is bent according to the shape of the patient’s chest  Minimum blood loss  Shorter operation and recovery time Nuss Procedure

4. The Nuss Procedure cont’d  The bar stays inside the patient for an average of 2-3 years  4% of pectus excavatum cases undergo the Nuss Procedure more than once, because the bar is removed too soon Before and After

5. Objective  To develop a steel bar prototype that will allow doctors to know the appropriate time to remove the bar from the patient without the risk of the chest wall regressing back to its original state, while conducting this information outside of the body wirelessly to provide the least additional discomfort for the patient. Real Proof of Concept prototype and Ideal Model

6. 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  Many different uses, such as electronic payment systems, goods tracking, and systems monitoring.  Semi-passive RFID vs. Active or Passive RFID

7. WISP  Wireless Identification and Sensing Platform  Developed by Intel  Built in Gyro., Accel., and Temp.  Wireless, battery-free  Powered solely by RF absorbed by antenna

8. WISP cont’d Wisp Functional Diagram

9. Intel’s Strain Gauge Solution  Strain gauge PCB has to be built to interface WISP with strain Wheatstone Bridge Amplifier SGPBC

10. Our Solution  Our solution: 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 will have 2 strain gauges with all the components built into the bar itself.

11. Steel Bar Titanium Bar Bent at factory in ideal shape. Stainless Steel Bar 9 in Young‘s Modulus: 192 Gpa Poisson’s Ratio: 0.265

12. Building the WISP Impinj Speedway 1000 RFID Reader

13. Building the WISP cont’d Antenna (900-925 MHz)

14. Building the WISP cont’d Strain Gauges SGD-13/1000-LY11 13 mm grid, 1000 ohms Strain Gauge

15. Building the WISP cont’d WISP

16. AutoCAD Model Real Prototype Model

17. AutoCAD Model Ideal Prototype Model (Unfinished)

18. PATRAN Model

19. PATRAN Model cont’d

20. Theoretical Design  Redesign of the WISP, Amplifier, and Wheatstone bridge for ideal model. Volume calculations with a design factor of 1.2 Black box (Not redesigning the electrical components).  Used to fit the components within the bar itself, including the Arcs.  Unbendable components such as the MCU of the WISP will be in straight portions.

21. What’s next?  Goals To test each set of equipment in a piecewise manner to ensure that everything is working To setup equipment  Challenges Building the circuit board Noise

22. Gantt Chart

23. Questions?

24. References  16-Year Old Boy With Severe Pectus Excavatum. Medscape: Medscape.  Nuss Procedure. http://surgvideo.surg.sunysb.edu/Volumes/ACSCD+July+2010/ACSCD/figures/ ch0409-f6.htm http://surgvideo.surg.sunysb.edu/Volumes/ACSCD+July+2010/ACSCD/figures/ ch0409-f6.htm  Before and After. http://www.gundluth.org/pediatrics/surgery/sunken-chesthttp://www.gundluth.org/pediatrics/surgery/sunken-chest  Wisp Functional Diagram. 2011. Elsevier. Feb. 19, 2013.  SGPBC. 2011. Elsevier. Feb. 20, 2013.  Strain Gauge. http://www.omega.com/pptst/SGD_LINEAR1-AXIS.html