Another Video of Pandemic Ventilator Norman

Here is a picture with the Plexiglas cover installed, ready for the science fair. The jug of water that was used for a weight is now replaced with a can filled with 4.5 Kg of metal. This makes for a more compact weight. The computer monitor is used to display LabView which is running on a P3 computer under the table.


Norman Pandemic Ventilator Ready for the Science Fair

Last week I showed some pictures of “Norman”, and a video of the ventilator running.
(link here)

This week I have another video that shows the functioning ventilator with alarms enabled and also outputting a pressure wave to Labview on the computer. When you see the video, it again shows it running with a pressure of about 22 cm of water and a stroke volume of about 400 cc. The black bag that is inflating and deflating is a lung simulator, and the gauge that is turning is a spirometer. The patient line occluded and the loss of air pressure alarms are demonstrated by occluding the patient line and then the compressor line. The pressure signal from the pressure transducer is displayed on the computer monitor.



Norman has now run for many hours with no failure of the bag. This prototype shows that the pandemic ventilator design can meet the pressure and volume requirements for a ventilator and can also be equipped with safety alarms, remote monitoring and control.

Norman Running on Video

In the blog so far I have written about and shown two prototype pandemic ventilators that we are working on. They are “Vinnie” (link here), and “Max” (link here). Today I will present the third prototype. This prototype will be named “Norman” after Norman Burn. Norman Burn was the Chief Technician at the Department of Anesthesia at Newcastle. Norman Burn built many of the very first positive pressure ventilators. Some of his “home made” ventilators were used during the polio epidemic in Britain in 1947. (link here)

A high school student at Forest Heights Collegiate in Kitchener Ontario is building “Norman”. It will be entered in the Waterloo Wellington Science and Engineering Fair to be held on April 1 2008.


Picture Here


Norman Pandemic Ventilator


Rockwell Allen Bradley Micrologix 1500


Ventilator Compressor


Jug of Water on the Bellows Plate


“Norman” is built from readily available components that can easily be obtained or re-purposed from other uses during a pandemic. It was constructed using the original design (link here) and is similar to “Max”, but with a few changes and improvements.

• The bellows is a vertical slider instead of a hinged bellows. The slider is constructed from Bosch struts (link here) and plastic panels. It is an innovative design that does not jam, yet is easily constructed and forgiving of slightly out of tolerance assembly.
• It uses an integral compressor so that it does not need to rely on pressurized air being available, but only electricity.
• It has a pressure transducer instead of a manometer. A restrictor valve has been added in the “to patient” line, so that the inspiration time can be adjusted.
• The bellows bag is a 2-liter PVC peritoneal dialysis bag. This is a very strong bag and has run many hours with no breakdown or apparent wear.
• The PLC is an Allen Bradley Micrologix 1500.
  

Here is a video of Norman running.



You can see that there is a jug of water on the bellows plate. Adjusting the amount of water in the jug on the bellows plate controls the maximum pressure generated by the bellows. The Checkmate pressure gauge behind the ventilator shows the maximum pressure is about 22 cm water. The Boeringer spirometer is recording a tidal volume of about 400 cc and a minute volume of about 7 liters.