The invention relates to a joint for laparoscopic surgery instruments. The joint can be coupled to (9) or integrated into (42) the surgical instrument. A circular piece (15) rotates in the circular socket (16) about a rotational axis (11) and conveys a force applied to the handle (4) or articulated handle (42) to the body (1) of the instrument, via internal gears, irrespectively of the rotation thereof (70) when the body (1) of the instrument describes an arcuate motion (50) centred in a fixed point of the abdominal wall (2) of the patient. The handle (4) of the instrument and the surgeon's hand (5) and forearm (7) are kept aligned, avoiding the need for rotation (60) of the surgeon's wrist (6).
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