Bone screw comprising a device for electrostimulation

A bone screw comprising

• a tubular bone screw part made of a biocompatible electrically conductive material, forming a first tissue electrode, said tubular bone screw part being open at both ends and having at one end a head which has a configuration adapted for engagement by a turning tool and a bone-screw-type external thread proximate the other end of said tubular bone screw part remote from said head;
• an insert part adapted to be inserted into and positioned within said tubular bone screw part, said insert part having a first end which is disposed proximate the head of said tubular bone screw part when the insert part is positioned therein;
• a second tissue electrode made of a biocompatible electrically conducting material and disposed at, and electrically insulated from, a second end of said insert part remote from said first end, wherein said second tissue electrode protrudes through the other end of said tubular bone screw part remote from said head when said insert part is positioned therein;
• and
• a receiving coil mounted within said insert part in which a low-frequency electrical alternating voltage is inducible by means of an external coil, said receiving coil having first and second terminals, one of which is electrically coupled to said second tissue electrode and the other of which is electrically coupled to said tubular bone screw part when said insert part is positioned therein.