The text says the following: "There were quite a lot of problems; oxygen is a very reactive gas, which rules out many motors and electrical devices. Normal air operated cylinders can only run on air, not pure oxygen so they could not be used.
The breakthrough was to repurpose an everyday syringe into an oxygen-powered ram.
A valve directs oxygen into the syringe which squeezes a self-inflating air container delivering 400ml of air directly to the patients’ lungs.
A second syringe acts as a timer and once the ‘breath’ has been delivered resets the ram ready for the next cycle.
In order to save and conserve oxygen, the waste gas is fed into a reservoir to enrich the patients’ air supply.
The ventilator is driven and controlled entirely from the hospital oxygen supply without the need for electricity.
The number of cycles per minute, volume of air delivered, and the pressure of the air can all be controlled according to patient’s needs.
“We designed the ventilator entirely from parts that can readily be made from stock materials or bought off-the-shelf. This means that if government approves and wants Gtech ventilators they can be made by almost any engineering and manufacturing company” says Nick “Gtech could produce around 100 per day within a week or two providing we could find steel fabrication and CNC machining companies to help us make some of the parts”.
Gtech produced two more ventilators, submitting these to the government for assessment.
Gtech, based in Worcester specialise in making cordless vacuum cleaners and garden power tools."