Abstract: A method for prevention of a parastomal hernia in a patient. First and second incisions are made in the skin, with the second incision made in the external rectus fascia above the first incision. An implant of a substantially flat ring having a central opening and provided with a number of anchoring elements radiating from an outer circumference of the ring is introduced through the first incision. The central opening of the implant is arranged above the second incision, and the anchoring elements are directed to securing positions on top the fascia. Next an end of an intestine is pulled through the second incision, the central opening of the implant, and the first incision, to create the stoma. The anchoring elements serve to keep the implant fixated and secured to the fascia while exerting pressure on the muscles to thereby reinforce the muscle structure and prevent hernia formation.