Equipment for HBO chamber

It's been ages since I did my HBO training and I haven't worked in the area for about 5 years, so I'm seeking info from those of you with more current knowledge.

We recently had a postop cardiac patient with cerebral air embolus who may have benefited from HBOT. However, he also had an implanted left ventricular assist device. It was a continuous flow device, made of titanium, and electrically driven by batteries.

I know that ventilators, IV pumps etc need to be approved for chamber use, but I can't remember what they need to have done to them. Is it just a matter of running a system in a chamber to see what happens?

What are the policies regarding implanted cardiac devices and HBOT? Any references or suggestions for further info I can give our bioengineers so we can sort this out for future cases?