DHI (Direct Hair Implantation)
Direct Hair Implantation, an FUE technique that places grafts using an implanter pen in a single incise-and-insert action.
- 1Needle tip — the only part that enters tissue
- 2Tapered nose gives the surgeon sight of the entry point
- 3Body and grip; balance over a long session matters more than weight
- 4Plunger cap, colour-coded by needle gauge
DHI, short for Direct Hair Implantation, is a follicular unit excision technique in which extracted grafts are placed using an implanter pen — a hollow-needle device that creates the recipient incision and inserts the follicular unit in a single action. It is best understood as a variant of FUE defined by its placement method rather than a wholly separate procedure: grafts are still harvested one unit at a time, but they are implanted directly rather than into pre-made incisions.
In practice
The defining instrument is the implanter pen. The graft is loaded into the needle, the operator sets the angle and depth against the scalp, and pressing the plunger drives the incision and delivers the unit together. This couples site creation and placement into one motion, which changes the team workflow: loading grafts into pens becomes a distinct task, and the needle gauge must match the caliber of the follicular units being placed. Gauge selection is a specification decision — too fine and a coarse graft is hard to load, too wide and the incision is larger than needed — detailed in the implanter needle gauge chart and the DHI implanters hub.
What buyers and professionals should know
Describe DHI neutrally. It is a placement method with its own logistics and instrument requirements, not a superior or inferior procedure — comparisons that rank techniques as "better" usually smuggle in assumptions about case type, team skill, and patient goals. The honest professional framing is that DHI and stick-and-place or pre-made-incision FUE are different ways to solve the same placement problem, each with practical trade-offs in workflow and instrumentation. The instrument-level contrast is covered in the FUE vs DHI instruments comparison.
For buyers, the metric that matters is what you can actually specify: implanter pen build quality, needle sharpness and gauge range, the spring or plunger mechanism, whether pens are single-use or reusable, and the sterility of packaging. Because pens are consumed in volume during a case, per-unit cost and reliability compound quickly, so evaluate them as you would any high-throughput consumable — on measurable properties rather than on the technique's marketing name.