The fine surgical wires used to manufacture Kirschner wires are of medical grade quality for temporary fixation during the surgery or for temporary surgical implantation that only remains throughout the required time of healing.
- 316LVM Stainless Steel
- 304V Stainless Steel
- Nitinol – Nickel Titanium (NiTi)
Material selection is often based on personal preferences. However, due to the cost differences between SS and NiTi, material selection restraints can enter into your design considerations based on project budget limitations.
When stainless steel wires are drawn to fine diameters, they develop a highly-polished appearance. The surface of smaller diameters (at or less than .040″) can be further smoothed using single crystal natural diamond dies.
Stainless Steel 316LVM Wire. SS 316LVM is a medical grade steel that is vacuum-melted for purity. Used for implantable medical devices, this wire is also applicable for fabricating components for precision electronics and the fabrication of woven wire cloth. This small diameter wire has a chemical composition that consists of Cr, Ni, Mo and Mn. The 316LVM Stainless Steel wire is a suitable close-tolerance material used in fabricating custom K-wires to your exact tolerance specifications.
Stainless Steel 304V Wire. This medical grade, austenitic stainless steel wire is initially electric-arc melted. For purity and homogeneity, the metal is further refined with vacuum arc melting. The typical chemical composition of Stainless Steel 304V may include Chromium, Nickel, Carbon, Manganese, Molybdenum, Silicon, Phosphorus, Copper, Cobalt, Nitrogen. Being one of the least expensive medical materials, it is the most popular alloy for medical appliances. Not only does 304V Stainless Steel have excellenth strength, it is easy to weld. Besides Kirschner wires, other common medical device components using the SS 304V alloy are guide wires, stylets, needles and catheters.
Nitinol Wire. Pure Titanium is generally accepted as an optimal material for implantable devices because of its extreme tolerance by surrounding contact tissues and that it does not induce toxic or inflammatory reactions. According to Jorma Ruhanen’s Biocompatibility evaluation of nickel-titanium shape memory metal alloy (2000), “Pure titanium and some of its alloys are considered to be among the most biocompatible materials (Albrektsson et al. 1981). The good biocompatibility is thought to be due to the stable titanium oxide layer. “
Ryhanen, J. (2000). Biocompatibility Evaluation of Nickel-Titanium Shape Memory Metal Alloy. Source: http://herkules.oulu.fi/isbn9514252217/. Accessed: May 24, 2011.