A prosthesis for inguinal hernias which is surgically inserted in a patient, made of a sole flat piece with a central cutting line which divides the flat piece into two asymmetric sides helically foldable to each other. Each asymmetric side has an oval shape with a narrow separation at middle point on its external edge due to an external cleft to provide an upper oval area and a lower oval area. After folding, the two sides form a reinforced central hole to allow the spermatic cord to fit therethrough. A preferably conic-shaped cap is provided in one of the lower oval areas, whose larger diameter base is fixed to the flat surface of one of the asymmetric sides and its lateral walls are free and adhered to the internal tissues of the patient.
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