What characterizes an insulated needle used in electrolysis?

An insulated needle used in electrolysis is characterized by having only the tip coated with insulating material. This specific design allows the needle to conduct electrical current effectively through the tip where it contacts the hair follicle, while the insulated part of the needle prevents any unwanted current from affecting surrounding skin or tissue. This targeted insulation is crucial for safety and precision in electrolysis treatments, ensuring that only the intended area receives the current necessary for hair removal.

In contrast, the notion that the entire needle is insulated would hinder its ability to conduct electricity effectively, as the current must reach the follicle. Materials like plastic are not suitable for the purpose of electrolysis needles, as they do not conduct electricity. The idea of a dual-purpose function is not standard for electrolysis needles, as their primary role is to deliver electrical energy to the hair follicle, and adding multiple functions could complicate the procedure and affect effectiveness.