What Instruments Does DHI Require?
The DHI-specific additions to a transplant tray: implanter pens across the gauges your case mix needs, generous needle stock per gauge, and loading forceps — on top of a standard FUE extraction set.
- 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 requires everything a standard FUE procedure requires for extraction, plus a placement set built around the implanter pen: multiple pens in the needle gauges matching your graft calibers, a generous stock of implanter needles per gauge, and fine forceps for loading grafts into the pens. The extraction side — punches, micromotor or manual handles, storage solutions and jeweler’s forceps — is unchanged from any FUE case; what defines the DHI tray is the implanter station.
The DHI tray, itemized
| Item | Role in the procedure | Sizing logic |
|---|---|---|
| Implanter pens | Hold and drive the needle that places each graft | Several pens per gauge in use, so loading and placing run in parallel |
| Implanter needles | The consumable tip; one gauge per graft caliber | Stock per gauge scaled to graft counts, plus reserve for bent or blunted tips |
| Loading forceps | Draw each graft into the needle without crushing it | Fine, non-serrated tips; several pairs so loaders work simultaneously |
| Extraction set | Punches, handpiece, extraction forceps | Identical to any FUE case — DHI changes nothing upstream |
| Graft storage | Chilled holding solution between extraction and placement | Same as standard FUE; placement pace sets how long grafts wait |
The pen count deserves emphasis because it surprises first-time buyers. DHI runs as a relay: while the surgeon places with one loaded pen, assistants are loading the next. A single pen per gauge stalls the whole procedure at the loading step, so working teams typically run several pens per gauge in active rotation — which multiplies quickly across a gauge range.
Gauges are the sizing decision
Implanter needles come in gauge steps matched to graft caliber: finer gauges for single-hair grafts destined for the hairline, larger ones for multi-hair units. A clinic’s gauge range should mirror its case mix, and mismatched gauge-to-graft pairing shows up immediately as either traumatized grafts (too tight) or poor anchoring (too loose). The gauge-to-graft pairings, with per-manufacturer sizing caveats, are tabulated in the implanter needle gauge chart.
Needles are also the tray’s true consumable. Tips blunt and bend in use, and a stalled case for want of needle stock is an avoidable failure — order depth per gauge, not breadth alone.
What DHI does not change
It bears repeating that DHI is a placement method. Extraction instruments, graft storage and donor-side workflow are identical to conventional FUE, so a clinic adding DHI to an existing FUE service buys the implanter station, not a new theatre. The genuine instrument-level differences between the two approaches — and the sites-first alternative using blades and placement forceps — are compared in the FUE vs DHI instruments guide.
Practical buying notes
Pens and needles are a compatibility system: needles fit specific pen designs, so committing to a pen line commits you to its needle supply. Evaluate needle availability, gauge range and reorder lead times as seriously as the pen itself — a well-machined pen with unreliable needle supply is a liability mid-case. Sample the pen-and-needle combination with your actual team before volume ordering; loading feel and spring behavior vary noticeably between manufacturers, and the assistants who load hundreds of grafts per case will have opinions worth hearing.