Device for anchoring a shoulder prosthesis in a reverse configuration, bone fixing screw and anchoring system

An anchoring system for anchoring a shoulder prosthesis in a reverse configuration comprising an anchoring device and a fixing screw, wherein:

• the anchoring device comprises:
• a baseplate delimited at a bottom of the baseplate by a first at least partially convex surface, adapted to interface with a glenoid, at a top of the baseplate by a second concave surface, opposite the first surface, and peripherally by a third truncated-cone or cylindrical surface,
• a central pin, protruding from said first surface, having an axially pass-through inner duct having at least one main diameter, said central pin having a first end connected to said baseplate and a second free end opposite said first end;
• said duct having a helical cavity made in an inner wall of the duct delimiting said duct, the inner wall being open towards an inside of the duct and extending along an entire length of said duct, in such a way as to place in fluid communication the second surface of the baseplate with the second end of said central pin;
• wherein said inner duct has a secondary diameter smaller than said main diameter and said helical cavity has a diameter greater than the main diameter of the inner duct;
• and
• the fixing screw comprises:
• a cylindrical body, a tip placed at one end of the cylindrical body, a head placed at a second end of the cylindrical body, opposite to the first end, and a thread extending helically along an entire axial extension of said cylindrical body, wherein said head has an outer diameter greater than the outer diameter of said cylindrical body and smaller than the outer diameter of the thread.