DHI is the acronym for Direct Hair Implantation
DHI Implanter Pen Technique (a.k.a. Choi Pen Technique) is the transplantation of the harvested grafts into the recipient area by using the implanter pen.
The implanter is a pen-like instrument with a hollow needle on one of its ends. The follicular units are implanted one by one directly into the transplant area in a specific direction, angle and depth, providing 100% natural results and maximum viability.
The use of the implanter pen provides channel incisions and deposit stages at the same time, which results in decreased trauma and blood loss during the transplant. Decreased trauma means faster healing and significantly higher graft survival rate.
A major advantage of the DHI technique is the ease of increasing hair density by implanting grafts between existing hairs.
Step by step procedure
- Following the registration at the hospital, the blood sample will be taken for the analysis. The next day the Doctor will be performing the hair and scalp analysis, understanding the patient´s needs and expectations, discussing the patient´s medical history, alopecia level, design and planning of the hair transplant operation.
- Once the design has been finalised and the consent form signed, the patient´s head will be shaved. The Doctor will mark the donor area to determine the extraction areas and the design process will finish. Needless to say that the patient’s opinion will also be taken to determine the final design of the implant.
- At this time the patient is ready to enter the operation room where the surgery will take place.
- Firstly, the local anaesthetic is administered in the donor area. The effect of local anaesthetic is immediate. Before using the local anaesthetic, we use a pre-anaesthetic (without a needle) to reduce the discomfort that the local anaesthetic might cause.
- The extraction of the follicles is carried out with a mix of manual and micromotor punch. The manual extraction is carried out with the manual punch, by making a circular incision around the follicular unit with a perpendicular angle. Once the incision has been made, the follicular unit is removed with forceps. The same incision is performed using the micromotor punch for the extraction.
- By using both tools for the extraction we are provoking less damage to the donor area, reducing the risk of transection which will lead to a better donor management and quicker recovery for all our patients.
- To increase the grafts survival rate, we perform partial extractions of 1000 grafts approximately in every session.
- Immediately after the harvesting of the grafts, Dr. Dogan Turan proceeds with the implantation, making sure that the grafts do not stay outside of the scalp more than 1.5h, which is directly related to the graft survival rate.
- All grafts are implanted by using the implanter pen (a.k.a. choi pen). The implanter pen allows the Doctor to place the graft with the desired angle and depth in a single movement without having the need to open channels previously. After the implantation of the grafts, there is a break so that the patient can rest and have lunch.
- After lunch, the process repeats itself. It must be taken into account that Dr. Turan, aiming to maximize the result of the implant, does not perform hair transplants of more than 3000 follicular units in the same day. In implants that exceed this number of follicular units, the operation will be carried out on two consecutive days. The second day begins at the same time of the first day. On this second day, the entire process flows faster by several factors: knowledge of the process by the patient, knowledge of both donor and implant areas by the doctor.
- The implanter pen used during the implant process is a tool specially designed for this technique of hair transplantation and has the following advantages:
- Smaller incision diameter than with other methods.
- It allows to implant a higher density per cm2 than other methods.
- It helps the doctor to use different angles of implantation – providing a more natural looking result of the hair transplant.
- Simple and modern medical procedure with 100% natural results.
- Better control of the angle and depth of implanter pen, which allows a more natural appearance.
- There is less damage to the follicular unit during the transplant.
- We can achieve a higher density: In the DHI technique, high density is 70-90 grafts / cm2. In FUE, this ratio is 50-60 grafts / cm2.
- Incision holes are not required since the follicular units are transplanted using a special DHI implant tool. Therefore:
- The existing hair is not damaged.
- The transplant area bleeds less and heals faster.
- There is a higher survival rate for the tissue.