Patent ID: 8343034

Claim:
An electric medical instrument fitting which is attached to a medical instrument holding device, comprising: a medical instrument holder provided to a holding portion of the medical instrument holding device, the medical instrument holder including: a plurality of arms: a first rotation joint which rotatably links the arms and rotates about a first rotation axis, as an imaginary X axis; a second rotation joint which rotatably links the arms and rotates about a second rotation axis, as an imaginary Y axis; a third rotation joint which rotatably links the arms and rotates about a third rotation axis, as an imaginary Z axis; a cross-point where an extension line of the first rotation axis, an extension line of the second rotation axis and an extension line of the third rotation axis intersect at one point; and a fitting body of the electric medical instrument fitting, the fitting body including: a fitting portion that is capable of attachment/detachment of a first medical instrument which is provided with an observation device and has channel holes for inserting treatment instruments; a plurality of fitting surfaces on which a plurality of second medical instrument drive units are respectively provided fixedly for a plurality of second medical instruments: each of the drive units being detachably connectable with a drive connecting portion provided at a proximal portion of each second medical instrument which is provided with a treatment portion on the side of a distal end of an insertion portion to be inserted into each channel hole; having a joint driver, an advancing/retreating driver and a rotation driver for changing position and posture of each treatment portion to be connected; and having a center of gravity positioned at a predetermined position on a roll axis of the rotation driver, and a surface having screw holes for arranging an intermediate member which makes a center of gravity of an entirety of the fitting body coincide with the cross-point of the medical instrument holder on an extension line of a center axis of the fitting portion in a state where the first medical instrument is attached to the fitting portion and the second medical instruments are respectively connected with the plurality of second medical instrument drive units which are provided fixedly on the fitting surfaces, wherein the medical instrument holder has an intermediate member fixing plate which is provided at the arm connected with the third rotation joint and to which the intermediate member is attached, and the fitting body of the electric medical instrument fitting is connected with the intermediate member fixing plate.