Surgical instrument

A surgical instrument, comprising:

• a shaft assembly operating device, for example a hand grip, and
• a shaft assembly, that is releasably couplable to the shaft assembly operating device, the shaft assembly comprising:
• a shaft, the shaft having a longitudinal channel, the shaft having a proximal end and a distal end,
• an actuation rod arranged in the longitudinal channel, the actuation rod having a proximal end and a distal end,
• wherein the shaft assembly operating device comprises a shaft assembly coupling device to couple the shaft assembly to the shaft assembly operating device, wherein the shaft assembly coupling device comprises:
• a first coupling element to couple the proximal end of the shaft, wherein the first coupling element is movable between a shaft locking position in which the proximal end of the shaft is locked and a shaft non-locking position in which the proximal end of the shaft is releasable from the shaft assembly operating device, and
• a second coupling element to couple the proximal end of the actuation rod, wherein the second coupling element is movable between an actuation rod locking position in which the proximal end of the actuation rod is locked, and an actuation rod non-locking position in which the proximal end of the actuation rod is releasable from the shaft assembly operating device,
• wherein the first coupling element and the second coupling element are movable by a single actuation from the shaft locking position to the shaft non-locking position and from the actuation rod locking position to the actuation rod non-locking position, respectively.