It absolutely isnt a solved problems, most countries affected by the pandemic do not manufacture the ventilators and have like a 10x shortage compared to what's needed to incubate everyone who will be sick. (Obviously depending on how bad it gets).

The struggle to ramp up production is a desperate one, and this is one case where IP is killing people - there are several consortia in the UK that are ready to manufacture, but need a certified design they could build.