Very fine medical wire is often coated with polyamide and/or polyimide coatings, often known as enamel insulation. These very thin coatings are chosen for their high temperature performance, allowing high densities of wires to be used in coils. Enamel insulation is also used where very thin coatings are needed to minimize the overall wire diameter, for example for medical applications.
To aid the connectorization of these very fine wires (<<30 AWG) they are often ribbonized in bi-filar, tri-filar or quad arrangements. Bi-filars are often used as thermocouples in catheters to measure the temperature of the adjacent tissue when procedures such as RF ablation are carried out.
For ribbonized enamelled wire, it can be desirable to remove a window of insulation from just one of the filars of the ribbon. See precision wire stripping for more information.
Enamel insulation is very effectively removed using our UV Odyssey range of enamel wire strippers. A key feature of ultra-violet laser technology laser is that the enamel insulation is very strongly absorbing at this wavelength and is immediately vaporized. Each pass of the laser removes a fraction of the insulation and typically four or five passes are required to remove the insulation fully. The laser ablates the insulation right down to the conductor leaving a perfectly clean surface for connectorization.