Unfortunately all those quickly hacked together ventilators will become e-junk after we'll have survived the corona virus, because none of them will get a standard approval. All they get is a temporary emergency permission.
I'm waiting to see if they'll even get that.
Even if the DIY stuff never gets temporary approval. The doctors and healthcare staff wont care, they will still use it.
All those DIY home laser cut and 3D printed face shields people are making aren't tested/approved but they're still being used in hospitals all over the place. With medical staff very happy to have something vs nothing.
If no medical ventilators are available but 10 people need one to make it through the night the medical staff will use whatever they can get ahold of. Even if it's not approved or not even medical equipment at all.
The typical rules, where hospitals won't try anything risky for fear of getting sued, are ignored in situations like this.
There's only so many times you can turn up to work and see people die because you don't have the gear to save them before you stop caring about company policy or rules in general.
If anyone from a hospitals legal team turns up in the ER saying.."You can't use that, it's not approved" they're likely to get punched in the face at best, or end up getting drugged, tied up and forgotten about in a utility room at worst.