The method involves providing (10) a three-dimensional vessel model of a blood vessel. A diameter sequence is formed along a target portion of the vessel model based on the determined regular interval diameter values of the target portion. A particular virtual tool model is formed (20) by transmitting the sequence diameter on a linear axis. An interlace portion is created (30) in the form of the tool model. An implant is formed (40) by braiding of wires around the interlace portion.
