Date post: | 31-Dec-2015 |
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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.
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 Pectus Excavatum
Overview cont’dRadio Frequency Identification (RFID)Miniature device that can wirelessly transfer data from a RFID readerTakes in a radio signal and transmits back out the stored information on the tagSemi-passive RFID
Wireless Identification and Sensing Platform (WISP)Developed by IntelPowered solely by RF absorbed by antenna
Wisp Functional Diagram
Overview cont’dIntel Strain Gauge Solution
Strain gauge PCB has to be built to interface WISP with strain Wheatstone Bridge Amplifier
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)
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
WISP Software
[ 1 byte | tag type] + [ 8 bytes | data] + [ 1 byte | WISP HW Version] + [ 2 bytes | HW Serial #]
[11]
Limitations and Obstacles
Limited time Limited knowledge of electronic components and code Hardware limitations Comparison of results virtual and experimental
Cost Analysis
Budget $750.00
Impinj Speedway 1000 RFID Reader $200.00
Antenna (900-925 MHz) $35.00
Strain Gauge (SGD-13/1000-LY11) $125.00
WISP Development Kit $0.00
Stainless Steel Lorenz Pectus Bar $0.00
Total $360.00
References [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