I have actually seen medical suction machines ( various brands) for sale on ebay.... if you think this is for you worth a look. Be really careful we these, the reason some doctors don't like patients to use them is the damaged tissues in the mouth are really delicate, and you can actually do damage with a suction machine if you are not careful. But lots of people here have used them without issue.

Brian, stage 4 oral cancer survivor. OCF Founder and Director. The first responsibility of a leader is to define reality. The last is to say thank you. In between, the leader is a servant.