I know of cannula usage in medical procedures today. One such example would be for inserting an IV cannula or intravenous cannula for administering fluids, medication, and / or blood products when a patient’s oral route is inadvisable. Those types of cannula are small durable polymer types, though. The tubes in those pictures could be also depending on size and other artifacts in context – there’s no scale of size I recognize as cannulation techniques may cover a broad range of bodily parts. Hardened glass types have limitations as well as dangers of accidental breakage if and when inserted – Seems unlikely. . .
Chinese do have acupuncture modalities today that are much more refined. It’s possible that those early glass tubes had some sort of utility, but I wouldn’t know what for. Some of their designs almost imply a method or motion or even physical application. What were their sizes and ages?
Edit))) reread and found 56 cm for one of them which would be approximately 20 inches or so . . . Flute possibly if each end is bored. . .
Edited 1 time(s). Last edit at 15-Feb-18 08:09 by Reagent.