They are not "new" - they are simply cleaned and resealed in packaging.
It would be crazy expensive to only use these instruments once.
It would be crazy expensive to only use these instruments once.
But, even then, people want to reuse items. (http://www.crd.york.ac.uk/crdweb/ShowRecord.asp?LinkFrom=OAI...)
Luckily there seems to be lots of research around reusable instruments.
(https://www.evidence.nhs.uk/search?q=disposable%20instrument...)