Guide for selecting and positioning a prosthesis

A method for determining the location of marks to be made on an external face of a skin of a patient intended to receive a prosthesis for treating a hernia defect, comprising the following steps:

• i) providing a device including sheet having a plurality of graphical representations concentrically embodying outlines of various shapes and sizes of prostheses, a plurality of first holes arranged along a transverse line passing through a center of the sheet, and a plurality of second holes arranged along a longitudinal line passing through the center of the sheet,
• ii) applying the device to an external face of a region of skin of the patient, under which the hernia defect is located, with the center of the sheet of material of the device substantially aligned on the site of the hernia defect,
• iii) pivoting the sheet of material so as to select the graphical representation corresponding to a size and shape of a prosthesis constituting the best coverage of the hernia defect,
• iv) marking the skin with marks in a transverse direction of the sheet and in a longitudinal direction of the sheet using the first and second holes of the device.