Piston Ventilator

Designer: Luis Marina Key Features: Pressure, volume, and breath assist modes possible. Data monitoring and setting control through touchscreen. Error alarm (piezzo buzzer). HME filters inspiratory and expiratory particulates to protect patients and medical personnel, while also maintaining humidity. 30 BPM @ 1 liter 60 BPM @ .5 liter BVM handles expiration valving, oxygen connection, PEEP port, and pop off valve. Can be hung on side of hospital bed. Compact. Runs on standard 120v AC converted to 12V. Allows easy addition of backup battery. If the system fails, the switch to BVM manual ventilation is instantly available. The only tools necessary are 3D printer and drill. Total cost <$300 potentially ~$200 at bulk pricing. General Description: The design centers around a 2' long 4" diameter PVC pipe and internal 3-D printed piston which is moved by a linear actuator (also housed within the pipe). Air is sucked through a readily available CPR one way flapper valve with a built in filter as the piston rises. As the piston is pushed down air travels into a hose which leads into a hospital bed Ambu or Laerdal bag. An HME filter is connected to the breathing port on the Ambu bag to retain humidity and act as a viral filter for the air entering the patient, as well as to filter exhalation air to protect healthcare workers. From the HME, an intubation tube enters the patient- providing critical air/oxygen. Utilizing the Ambu bag allows for an adjustable PEEP valve to be easily attached, and also provides an oxygen port, mixing chamber, and non electronic exhalation control valving. In the event of a ventilator failure, because it is inline with the system- manual Ambu ventilation can begin immediately. The system HMI features a 3.5" Nexion touchscreen which can provide setting adjustment and parameter monitoring. The latter is compatible with the Arduino, which controls the actuator through an H-bridge. To sense the pressure differential between the ambient air and patient