to be clear, the glass is still just glass and not all that strong… but the real star of the show is the tissue surrounding it… it will buffer and disperse any blunt force coming in and mold around the glass tube. this is what gives the implanted glass tube such apparent strength, while outside the body (or implanted directly over bone) it is still quite fragile.
that said, there are many types of glass in use out there and it is definitely not all created equal… our glass is Schott 8625 VivoTag glass and is very strong and properly laser sealed that ensures minimal internal tension on the sealed end caps.
Check the testing page for more examples of what our glass can handle once implanted;