process for coupling a mechanical interface unit to a laser device, and apparatus for cutting part of an eye tissue

摘要

process for coupling a mechanical interface unit to a laser device, and apparatus for cutting a portion of tissue from an eye. according to an exemplary embodiment, a method for coupling a mechanical interface unit (34) to a suction ring unit (16), which is held over an eye by suction force, comprises a step of bringing the unit of interface relatively closer to the suction ring unit in an axial direction, into a first predetermined relative position of the two components which is preferably detected by suitable sensors. when the first relative position is reached, the evacuation of a suction chamber (42), formed between the interface unit, the suction ring unit and the surface of the eye, is initiated, the negative pressure, produced in the suction chamber , establishing a contact between the eye surface and a flattening plate (40), maintained on the interface unit, or increasing the size of an existing contact region. suction of the eye on the flattening plate prevents the eye from being subjected to compressive and shearing stresses, such as those that are often unavoidable when the plate is pressed against the eye.