2 degrees of freedom prosthetic wrist structure

A prosthetic wrist unit allowing a connection between an arm and a hand mechanism, comprising:

• a wrist base unit with at least one connection slot and at least one connecting piece, wherein the hand mechanism is inserted into the at least one connection slot, the at least one connecting piece enables a rotational movement of the wrist base unit, wherein the at least one connection slot is located at a front end part of the wrist base unit while the at least one connecting piece is located at a rear end part of the wrist base unit;
• a joint including a joint seat and a joint body, wherein, the at least one connecting piece is inserted in to the joint seat, in order for the rotational movement of the wrist base unit to take place, the at least one connecting piece is allowed to move in the joint seat;
• a locking mechanism comprising a locking mechanism opening, wherein the joint body is inserted into the locking mechanism opening and the locking mechanism opening enables the prosthetic wrist unit to operate in a fixed position or a movable position;
• an arm coupling unit, wherein the joint and the locking mechanism are inserted into the arm coupling unit, the arm coupling unit restricts a movement of the joint and the locking mechanism, the arm coupling unit includes a front end having an arm coupling unit opening and a rear end, wherein the locking mechanism is fitted into the arm coupling unit opening, and the arm is inserted into the rear end;
• and
• at least one tendon ensuring a joint stiffness of the prosthetic wrist unit;
• wherein the at least one connecting piece of the wrist base unit and the joint seat of the joint are in a form capable of providing a 2 degrees of freedom wrist movement as flexion-extension and abduction-adduction.