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Neonatal Chest Compression Device

Neonatal Chest Compression Device. Courtney Gallagher Jillian Zeber Advisor: Dr. Walsh, Vanderbilt NICU. Problem Statement. When performed in conjunction with operations of the neck and lower abdomen, there is limited space for manual chest compressions.

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Neonatal Chest Compression Device

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  1. Neonatal Chest Compression Device Courtney Gallagher Jillian Zeber Advisor: Dr. Walsh, Vanderbilt NICU

  2. Problem Statement • When performed in conjunction with operations of the neck and lower abdomen, there is limited space for manual chest compressions. • Manual chest compressions require both hands to be wrapped around the chest. • 2 occurrences at the Vanderbilt NICU this past year.

  3. Project Goal • Small, easy to setup device that will perform automatic chest compressions on a 0-30 day old infant for use in the OR during a simultaneous procedure.

  4. Performance Criteria • Small but adjustable to fit the size of the baby. • Provide enough force for sufficient chest compressions to reduce the width to one third, 2 to 3 cm. • Apply the 11-12 lbs of force directly below the nipples in the center of the chest. • Verified with bathroom scale and free weights. • Maintain a rate of 80-100 compressions per minute for blood pumping. • Simple and easy to use by Dr. Walsh in the NICU

  5. Force Required for Chest Compressions Desired Force Range: 11 – 12 lbs

  6. Solution Proposal 15 cm Solenoid Valve Electronic Timer Power Supply 2-3 cm 6-9 cm Adjustable depending on size of the baby

  7. Solution Proposal 15 cm Solenoid Valve Electronic Timer Power Supply 5 cm 4-6 cm Adjustable depending on size of the baby

  8. Solution Proposal Exhaust 3- WAY Air Cylinder Air Compressor

  9. Device Components • Single-acting spring return pneumatic cylinder • Air compressor with coil hose • Solenoid valve controlled by electronic timer • On/off time range: 0.1 s to 99 hr • Power supply: wall outlet • 1.1 inch diameter plunger to displace chest 2-3 cm • Wheel-up cart supporting electronic components & air compressor • Support structure: • Currently: stand with base and adjustable arm • Ideally: Swivel arm connected to side panel of GE OmniBed

  10. Calculations Air Cylinder Specs Timer Settings • On/Off time: • Cycle Length = 1/Cycle Freqency • On/Off time = Cycle Length/2 • Bore size: F = p A= p π d2/4       where F = force exerted (N) p = gauge pressure (N/m2, Pa) A = full bore area (m2) d = full bore piston diameter (m) F = 11 lbs = 50 N p = 100 psi = 689.5 kPa  d = 10 mm ≈ 7/16” • Stroke length: > 3 cm with extra space  5 cm ≈ 2”

  11. Factors • Provide necessary but not excessive force (11-12 lbs = 5 kg) • Materials that can be sterilized • Comfortable • Quick setup • Potentially portable • Safety • Adjustable

  12. Implementation of Factors into Design • Sterilizing plunger and stopper with plastic drapes • Dr. Walsh • Vary force applied with the psi of compressed air applied to cylinder • Variable rate with micro-timer • Adjustable with flexible arm coming out of NICU bed

  13. Evaluation • Isabel in the NICU Simulation Lab • Responds like an alive baby • Provides vitals • Can determine if chest compression are adequate

  14. Previous Work • Researched existing adult compression devices • AutoPulse, Lucas, Thumper • Established goals and criteria that must be met • Discussed with advisors • Measured force required to provide chest compressions • Decided on a prototype design • Pneumatic cylinder • Researched and purchased materials to build prototype • Pneumatic cylinder and Air compressor • Solenoid valve, timer • All necessary connections • Tested simplified version of prototype • Verified applied force was correct • Ordered more parts

  15. Current Work • Finishing DesignSafe • Getting in touch with GE contact • Kent Meeks • Building complete version of prototype • Testing full prototype

  16. Future Work • After testing, make modifications and re-test • Build flexible arm • Test • Make Demo • Evaluate effectiveness against traditional method

  17. References • http://www.zoll.com/medical-products/cardiac-support-pump/autopulse/ • http://content.onlinejacc.org/cgi/content/full/44/11/2214/FIG2 • http://www.omega.com/auto/pdf/SimpValvesguide.pdf • http://www.gehealthcare.com/euen/maternal-infant-care/products/microenvironments/giraffe_omnibed/index.html • http://www.engineeringtoolbox.com/pneumatic-cylinder-force-d_1273.html

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