Patent ID: 7109678

Claim:
A holding arrangement for an instrument including a medical-optical instrument, the holding arrangement comprising: at least one rotational joint which is subjected to a load torque by said instrument; said rotational joint having a first joint part and a second joint part which can be moved relative to the first joint part: and, an apparatus for balancing said load torque applied to said rotational joint; said apparatus including: an electric motor; a detecting unit for detecting a position of said rotational joint and for providing a signal representing a position value for said position of said rotational joint; said electric motor being combined with said detecting unit; and, said electric motor being connected to said second joint part by means of a shaft; a control unit for receiving said signal and assigning a motor current to said position value; and, said control unit outputting said motor current to said electric motor so as to cause said electric motor to generate a counter torque introduced into said second joint part of said rotational joint to balance said load torque applied to said rotational joint.