After microscopy dissection was introduced, the chance for hair transaction during the surgery was mainly during donor harvesting.
To reduce it, the instrument changed from a multiple blade knife to a single knife. Instead of cutting blindly, the Haber Spreader and Tykocinski intruder were invented.
So far the intruder seems the safest and has minimum transecting rate( less then 1%).
The method is to score the outline about 2mm in depth, then make multiple insertions of the intruder into the incision line going to a depth slightly below the hair bulbs. Then, using two skin hooks to separate the incision gently. This way there is almost no transection and you don’t have to worry about damaging nerves and vessels.
Tykocinski intruder is easy to use and a great break through for donor harvesting.