I would also recommend another doctor .
I had a minor bend 2 years ago (tingling in arm) When I went back for the check up a different doctor told me "That using a ccr was not a good idea due to high O2 levels & that diving anything other than 21% was just asking to get bent !" This being one of the doctors at Whipscross Chamber .
She doesn't work there anymore

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Colin
I trust my rebreather completely ,
I just don't trust the user
onwards & downwards