Fine wire is coated with PTFE.

California Fine Wire (CFW, Grover Beach, CA; 805/489-5144) coats very thin wire with PTFE for use in medical and other applications. Next-generation medical applications for PTFE-coated wire include catheters for inserting computer chips, probes, sensors, monitors, and remote devices into the body for treatment of brain or organ problems, according to the company. Because it is inert, PTFE does not react to chemical or biological agents. This characteristic renders PTFE-coated devices useful in invasive surgery because they are less prone to rejection by the human body than other devices. According to CFW, bone staples, wires, plates, and pacemaker wires can all be coated with PTFE.