A medical mechatronic male interface device couples a surgical assistance system to a mount. The male interface device includes a base including an end face and a functional body extending from the end face, a first mechanical coupling for positive and/or non-positive coupling to a medical mechatronic female interface device, and at least one first electronic interface configured to connect to a second electronic interface of the female interface device. The functional body includes a centering device that centers the surgical assistance system free of play relative to the base. The centering device includes a first functional surface, a second functional surface, and a third functional surface that together at least partially define a three-sided pyramid. The first mechanical coupling includes a first undercut and a second undercut on the functional body that each define a segment engageable from behind.