Screwdriver

A screwdriver for introducing and screwing a screw into the human or animal body and/or for unscrewing and removing a screw from the human or animal body, comprising:

• a handle;
• a shaft connected to said handle, said shaft having a head at a front end of said shaft that can be brought into engagement with a screw head of a screw for screwing said screw in and out;
• a retention device for retaining said screw on said shaft,
• said retention device having an inner tubular shaft surrounding said shaft and having a clamping gripper at a front end of said inner tubular shaft, said clamping gripper being preloaded into an open position,
• said retention device further having an outer tubular shaft surrounding said inner tubular shaft;
• an actuation device for said inner tubular shaft and said outer tubular shaft, said actuation device being movable from a first position into a second position, as a result of which said clamping gripper is displaced over said head from a pulled-back position, and said actuation device being movable from said second position into a third position, as a result of which said outer tubular shaft is displaced relative to said inner tubular shaft over said clamping gripper in order to close the latter, and vice versa,
• wherein
• at least one of said inner tubular shaft and said outer tubular shaft is joined removably to said handle,
• said actuation device is arranged on said handle and is movable into a fourth position in which said at least one of said inner tubular shaft and said outer tubular shaft is removable from said handle, and
• said at least one of said inner tubular shaft and said outer tubular shaft is fixed on said handle by moving said actuation device from said fourth position into said first position.