DHI hair transplant is performed using a Choi pen during the creation of the channels.

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.
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