Emergency Ventilator Joshua Gess Jimmy Grotting Tim Weaver

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 Ø Sure. Vent – looked to improve this existing system Ø High Frequency Jet Ventilation – revolutionary form of ventilation Ø Incorporation into new idea-(piston actuator, reverse whistle, acoustics, pneumatic actuator, fans) Ø Final Design: Solenoid Valve Ø

Design Schematic

Micro. King Air Control Valve 3 -Way inline valve for rapid control actuating Ø 4. 8 Watt Solenoid for 12 VDC Ø Operating pressure: . 42 psi Ø Operating frequency: 0 – 15 Hz Ø Price: $25. 00 Ø

Function Generator MFJ Portable Function Generator for $80. 00 Ø Simple square waves with variable frequency Ø Oscillator circuit consisting of step function generator Ø

Prototype Testing Ø Pressure Transducer l l Ø PX 24 A Arrives 4/11 or 4/12 Lab. VIEW data acquisition software l l Simple data recording FFT

Testing Apparatus