DHI (Direct Hair Implantation) should not be considered a new method, but a modified form of FUE hair implantation that entails the same processes and results. In FUE hair transplant, the doctor creates channels over the recipient area using sapphire blades and places the grafts into the opened channels. On the other hand, in the DHI method, the doctor uses a tool resembling a ballpoint pen to insert the grafts into the recipient area without creating any channels. This tool is called the Choi pen.
DHI hair transplant is performed using a Choi pen during the creation of the channels. This small device, shaped like an interlocking ballpoint pen,
has an outer Teflon coating and is designed to be resistant to temperatures of up to 130 degrees Celsius. The needle points at the end of the pen
are where grafts are placed. This needle resembles an injector but is vertical, and the endpoints are serrated. The serrated ends are made this way
so that the hair grafts can be placed into the needle before the transplant.
For an average DHI hair transplant process, 4 to 6 implanter pens are used. The method consists of two stages. The first stage involves placing the hair follicles into the pen. A specialist and two assistants take part in this stage, and it must be completed quickly. Hair follicles taken from the petri dish are placed inside the pen one by one. These hair follicles are placed into the needle by sliding.
The second stage involves transplanting the grafts placed inside the needle. The needle points with the grafts inside are approached to the hairless area with an appropriate angle, and the skin is pierced with the needle. At this point, the pen is pressed from the top. After the hair follicle at the needle’s end is pushed into the hole in the hairless area, the DHI hair transplant is complete.
It is important to note that, as with any application, a DHI hair transplant should be carried out by a specialist. The size of the holes pierced in the skin is of particular importance during the process, and there is no possibility of success if the holes are too big.