Method of manufacturing a gripping surface for an end effector and surgical instrument comprising a gripping end effector

A method of manufacturing a gripping surface for an end effector of a surgical instrument by wire electro-erosion, comprising the following steps of:

• providing a wire electro-erosion machine having a cutting wire;
• mounting at least one workpiece to the wire electro-erosion machine;
• making a surface micro-topography by wire electro-erosion;
• wherein the step of making a surface micro-topography comprises the steps of:
• performing a first through cut on the at least one workpiece according to a first cutting path comprising peaks and valleys, exposing at least one exposed portion on the at least one workpiece comprising reliefs and recesses corresponding to said peaks and valleys of the first cutting path;
• then, rotating the at least one workpiece with respect to the cutting wire about a rotation axis;
• then, performing a second through cut on the same at least one exposed portion of the workpiece according to a second cutting path comprising peaks and valleys, making on said at least one exposed portion a surface micro-topography having a plurality of raised islands delimited by grooves.