DHI (Direct Hair Implantation) uses a special pen-like tool โ€” the Choi implanter pen โ€” to place follicles directly into the scalp without pre-opening recipient channels.

Key Difference from FUE

In standard/Sapphire FUE, channels are opened in the recipient area first, then grafts are placed into them by hand. With DHI, the Choi pen both opens the micro-channel and places the graft in the same motion โ€” two steps become one.

Advantages

  • Grafts spend less time outside the body (shorter ischemia time), which some studies associate with graft survival rates ranging 90-97%, potentially higher than standard methods.
  • Allows more precise control of channel angle and depth, an advantage for natural-looking hairline design in particular.
  • Can be performed without shaving the head ("no-shave DHI"), making the procedure more discreet.

Disadvantages

  • Procedure time is longer, which usually means higher cost.
  • Can be more logistically demanding at very high graft counts (5,000+).
  • Outcomes depend heavily on the experience of the performing team.
Who it suits: Particularly favored by patients seeking a natural, dense hairline design, preferring a no-shave procedure, or needing a moderate graft count.