Short answer
Diamond dusting is a fine layer of tungsten carbide applied to an instrument working surface, usually needle holder or forceps jaws, with an electrical applicator and a tungsten carbide electrode. It gives a hard, textured grip for fine suture needles and tissue. The Carbitron 300, the original diamond-dusting system, deposits it at 78 to 80 Rockwell C.
What diamond dusting is
Despite the name, there is no diamond involved. A tungsten carbide electrode is held against the instrument while short electrical discharges transfer carbide into and onto the surface. The result is a fused, textured layer of tungsten carbide, much harder than the stainless steel underneath.
Instrument makers mark diamond-dusted needle holders with black handle rings, which helps sterile processing staff tell them apart from instruments with tungsten carbide inserts, usually marked with gold rings.
Which instruments get it
- Needle holders for very fine suture needles, where a smooth jaw would let the needle rotate or slip
- Forceps that need a secure grip on delicate tissue
- Other instrument working surfaces where a hard, textured grip helps
Diamond dusting vs carbide inserts vs plain stainless
| Jaw type | How it is made | Typical marking |
|---|---|---|
| Plain stainless steel | Serrated stainless jaws | None |
| Tungsten carbide inserts | Separate carbide pieces fitted into the jaws | Gold handle rings |
| Diamond dusted | Fine tungsten carbide layer deposited onto the jaws | Black handle rings |
Plain stainless steel jaws cannot be repaired once they wear out, so the instrument is replaced.
Equipment used to apply it
Diamond dusting is applied with an electro-spark deposition system: a power supply plus a vibrating hand tool holding a tungsten carbide electrode. Hunter Products invented the Carbitron 300 as the original diamond-dusting platform for the medical and dental industries, and it is used today by surgical instrument repair companies and instrument manufacturers.
The Carbitron 300 deposits tungsten carbide at 78 to 80 Rockwell C, with thickness set from 0.0002" to 0.001" in 0.0002" steps. Electrodes come in 1/8", 1/16" and 1/32" sizes; the 1/32" electrode is the one for fine, precise work. The system is $495 and replacement electrodes are $12.50.
Frequently asked questions
Is diamond dusting made of diamond?
No. Diamond dusting is a fine layer of tungsten carbide applied with an electrical applicator and a carbide electrode.
How do you identify a diamond-dusted needle holder?
Diamond-dusted needle holders are commonly marked with black handle rings. Gold rings usually mark tungsten carbide inserts.
What equipment applies diamond dusting?
An electro-spark deposition system with a tungsten carbide electrode in a vibrating hand tool. The Carbitron 300 is the original diamond-dusting system.
How hard is a diamond-dusted surface?
The tungsten carbide deposited by the Carbitron 300 is 78 to 80 Rockwell C, much harder than the stainless steel of the instrument.
Not sure how much carbide your tool needs?
Tell us the tool, the material it cuts or forms, and where it wears. The people who build the Carbitron will tell you how to apply it.