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Ultrasound can push vaccines into the body without needles
(www.newscientist.com)
This is a most excellent place for technology news and articles.
I don't think there would be any need to dispose of any part of the ultrasound system; perhaps a disposable paper or plastic cover to speed up cleaning between patients. Meanwhile the needles are single use and must be disposed of properly since they are a bio-hazard. Can't really see how a needle could possibly compete on the waste side of things.
Yeah, maybe he was talking about something else because it's hard to see what would be worse than used needles.