In the past medical supplies were mainly glass and metal. As nursing staff you opened a sterile package, out together glass and metal objects. Put them together. Used them. Put them on carts where they went back to the sterilization department. They were washed, cleaned, repackaged, resterilized. Sent back to the floor on carts. It was a major production. A major cost. And a problem for small medical facilities. Only large hospitals could afford these departments and these massive autoclave machines
other hospitals had to sub contract. have daily supplies delivered by truck.........
the other issue was hospitals had to have tons of equipment. Glass syringes broke, frequently. Metal things bent. And each floor had to have a supply of these wrapped trays to use
and of course sterilization could be flawed
the switch to disposables, while a cost to hospitals was a big savings. And made clean, sterile objects available to everyone
when I started nursing, the only actual disposal plastic things we used was IV tubing. the actual fluids was in glass bottles. The weight of all these supplies was quite remarkable