Elbow orthosis and process for adapting a configuration of such an orthosis to a patient

An elbow orthosis (2) comprising a first fitting (4) configured to be mounted on an arm (A) of a patient (P), a second fitting (6) configured for being mounted on a forearm (F) of the patient, an articulation mechanism (14, 20, 22) between the first and second fittings and an electric gear-motor (8) mounted on the first fitting for moving the second fitting with respect to the first fitting in rotation around a first rotation axis (A1) of the articulation mechanism, wherein

• an output shaft (84) of the electric gear-motor is aligned on a second rotation axis (A2) perpendicular to the first rotation axis and
• the orthosis is equipped with
• an angular sensor (28) for sensing the angular position of the second fitting (6) with respect to the first fitting (4) around the first rotation axis (A1) and
• a torque sensor (628) for sensing a torque exerted on the articulation (14, 22) mechanism by the electric gear-motor (8);
• a worm-and-wheel transmission (22) drives a rotation shaft (20), which defines the first rotation axis, from the rotational movement of the output shaft (84) of the electric gear-motor;
• the second fitting (6) is secured to the rotation shaft;
• and
• a mechanical stop arrangement (40) is configured for limiting the angular movement of the second fitting (6) with respect to the first fitting (4) around the first rotation axis (A1),
• the mechanical stop arrangement (40) includes:
• a first plate (402) provided with a first circular slot (4024) and a first series of through holes (4028) spread on a circle centered on a central axis (A402) of the first circular slot;
• a second plate (404) provided with a second circular slot (4044) and a second series of through holes (4048) spread on a circle centered on a central axis (A404) of the second circular slot;
• and
• a crank (408) secured to the rotation shaft (20) and equipped with a pin (409) engaged in the first and second circular slots (4024, 4044);
• the first and second plates (402, 404) are aligned on a common central axis (A1, A402, A404) and their relative orientation around this common axis is set by aligning at least one through hole (4028) of the first series with one through hole (4048) of the second series;
• some portions of the first and second circular slots (4024, 4044) overlap, depending on the orientation of the first and second plates around the common axis;
• and
• the respective extremities (4024A, 4024B, 4044A, 4044B) of the overlapping portions (S4A, S4B) of the first and second circular slots (4024, 4044) define the amplitude (γ40) of the maximum angular movement of the second fitting (6) with respect to the first fitting (4), around the first rotation axis (A1), when it is driven by the worm-and-wheel transmission (22).