Patent ID: 8632563

Claim:
A surgical instrument comprising: a treatment part opening-and-closing operating part comprising a fixed handle and a pivoting handle, which also serves as a gripping part; an elongated treatment part operating rod having rigidity, which is connected to the pivoting handle of the treatment part opening-and-closing operating part, which is arranged to be rotatable about an axis of the elongated treatment part operating rod, and which advances and retracts in accordance with the operation of the pivoting handle; an insertion part through which the elongated treatment part operating rod is inserted; a pivoting base which is pivotably shaft-supported on a distal end portion of the insertion part via a pivoting shaft disposed in a direction perpendicular to a longitudinal axis of the insertion part; an elongated pivoting base operating rod having rigidity, a distal end portion of which is connected to the pivoting base, and which causes the pivoting base to pivot about the pivoting shaft by an advancing and retracting motion; a treatment part base which is held to allow rotation about an axis of the pivoting base with respect to the pivoting base, and on which a surgical treatment part which performs an opening-and-closing action in accordance with the advancing and retracting operation of the elongated treatment part operating rod is disposed; and a joint member having two sets of universal joints and constituting a connecting part having rigidity that connects the elongated treatment part operating rod and a connecting member which is pivotably shaft-supported at one end of the surgical treatment part disposed on the treatment part base by a connecting pin in a parallel positional relationship with the pivoting shaft, each of the two sets of universal joints comprising a pair of ordinary hinges oriented at 90° relative to each other, the joint member transmitting pivoting motion of the elongated treatment part operating rod about the axis of the elongated treatment part operating rod to the connecting member.