Prosthesis or orthosis

A prosthesis or an orthosis for a joint, comprising:

• a first body,
• a second body,
• an articulated joint between the first and second bodies, the articulated joint allowing the rotation of the first and second bodies with respect to one another around a joint rotation axis,
• a locking mechanism configured to selectively lock the rotation between the first and second bodies in one direction, when it is in a locked configuration,
• a transmission mechanism between the joint rotation axis and a lockable part of the locking mechanism, such that a rotation of the joint rotation axis generates a movement of the lockable part, the axis of the movement of the lockable part being shifted relative to the joint rotation axis,
• wherein the transmission mechanism is configured to transfer load between the joint rotation axis and the lockable part of the locking mechanism, and comprises a reducer configured to reduce effort to lock the rotation of the first body with respect to the second body,
• wherein the reducer includes a hoist comprising at least one pulley and one rope, the pulley or pulleys being linked to the joint rotation axis, the rope being linked to the pulley or pulleys and to an anchoring part fixed to the second body while being attached to the lockable part of the locking mechanism, and said prosthesis or orthosis for a joint having a plane of symmetry orthogonal to the joint rotation axis,
• wherein the reducer includes:
• two pulleys positioned on both sides of the plane of symmetry, each pulley being linked to the joint rotation axis, and
• one rope, which passes around the two pulleys and around an anchoring part fixed to the second body, while being attached at its ends, on both sides of the plane of symmetry, to the lockable part of the locking mechanism.