Needle, Device, and Machine Safety
Needle and machine safety questions test device selection, sterility, sharps handling, and equipment maintenance. The needle is the most direct infection-control risk in PMU.
Core rules
Select needle configuration by effect: fine round liners for detail and hair strokes, larger round liners or magnums for shading. Check gauge, taper, and cartridge compatibility with the handpiece. Inspect sterile packaging before use; reject damaged or wet packaging. Never reuse a cartridge, even on the same client. Adjust voltage to the needle and technique; excessive voltage increases trauma and splatter. Keep cords away from water and client movement. Clean and disinfect the machine exterior per manufacturer instructions, and store devices dry and covered.
Worked example
A client wants fine brow strokes, but her skin is oily. Reasoning: a 1RL at low voltage can create crisp strokes, but oily skin may blur them; consider a small shading needle or combo technique instead. Select the needle for the skin and effect, not only the requested look.
Traps
Recapping by hand; reusing cartridges; using a needle with a bent tip; operating above recommended voltage; skipping package inspection; cleaning a machine with excessive liquid.