My toolbox is full of repurposed surgical instrumentation.
Including stainless steel pliers (double hinged action) perfect replacement for mole grips.
Curved artery forceps , perfect for reaching and cleaning orbits without having to dismantle anything.
Straight long nosed forceps, ideal for removing tricky to reach bulbs (once a bit of surgical tape has been put over the ends)
Perforated stainless steel box, perfect for putting small plastic or rubber items in dishwasher without fear of losing them.
Bone cutters, good substitute for wire cutters
Titanium bone screws, good substitute for wood screws (at over £80 per screw I know they're not going to rust or even lose their shine)
K Wires make excellent wire gates
Stainless steel orthopaedic mallet, for those things that require a little extra encouragement to fit.
Aluminium Oxide powder (used for cleaning lenses on laparoscopes) gets added every time I use my tumbler.
Swabs make great glass/playfield cleaners as they are lint free.
plus many more.
Just those listed above, if bought new, would cost well over £1,000.