On Fri, Apr 10, 2020 at 08:54 PM, <sydneygold888@...> wrote:
If using a bellows style with DC servo drive motor we could get infinite output curves with the right software.
Good point. From my layman's (but hopefully improving) view that is a good way to go. There is an interesting "museum" of photos of old ventilators. Bellows were ?one of the main designs. Seems like the Bird ventilator was an early departure from that, using a nozzle blowing compressed oxygen into a venturi to suck in air to mix with the compressed O2 gas flow. Timing and control done by air circuits. In many ways that design is more amazing the current designs that can rely on a microprocessor to do the heavy lifting.
In my case I'm leaning towards a design that optionally could use one "low pressure" air source (bellows, turbine, bellows or blower air mattress inflators, industrial strength turbine pumps) to power multiple ventilators. So I'm looking at an easy to build, possibility disposable, valve(s) controlled by an RC servo. Also it seems the two port designs are universal, have many accessories designed to work within that system, and have evolved to handle the real world of sick patients driving messy substances into the system.?
Many creative designs have been proposed to help in they crisis. Even if many don't make it out of the gate immediately, maybe we will see many of these designs developing into innovative, smaller, simpler to use, more cost effective machines that will make it into the mainstream in the future. ?
Tom, wb6b
