Emergency Ventilator Joshua Gess Jimmy Grotting Tim Weaver Ryan Winter Whitt Israel Advisor: Dr. Paul King April 11, 2005

Lung Volume During Emergency Respiration The average human has a total lung capacity (TLC) of 4-6 liters The average tidal volume is only 0.5 liters Even at vital capacity, about 25% of the lung volume remains (residual volume) Residual volume can allow chemicals or other foreign substances to remain in the lung

How High Frequency Ventilation Promotes Fluidic Mixing Shorter bursts of air create a turbulent atmosphere Fresh air mixes with residual volume Clean air reaches alveoli more quickly Allows for oxygen to be more efficiently absorbed Waste gases are removed more efficiently

IPV vs. Bulk-Flow Ventilation Figure 1: Bulk flow ventilation Figure 2: Percussive ventilation

Design Progression  Ambu Bag – too much attention to device and not enough to patient  SureVent – looked to improve this existing system  High Frequency Jet Ventilation – revolutionary form of ventilation  Incorporation into new idea-(piston actuator, reverse whistle, acoustics, pneumatic actuator, fans)  Final Design: Solenoid Valve

Design Schematic

MicroKing Air Control Valve  3-Way inline valve for rapid control actuating  4.8 Watt Solenoid for 12 VDC  Operating pressure:.42 psi  Operating frequency: 0 – 15 Hz  Price: $25.00

Function Generator  MFJ Portable Function Generator for $80.00  Simple square waves with variable frequency  Oscillator circuit consisting of step function generator

Prototype Testing  Pressure Transducer PX24A Arrives 4/11 or 4/12  LabVIEW data acquisition software Simple data recording FFT

Testing Apparatus