Artificial knee joint and prosthetic limb

An artificial knee joint comprising:

• a thigh joint part provided on a thigh part side;
• a lower leg part rotatably connected to the thigh joint part via at least one rotation shaft;
• a rotational resistance applicator including:
• a cylinder fixed to one of the thigh joint part and the lower leg part and filled with a working fluid;
• a piston provided movably between the thigh joint part side and the lower leg part side in the cylinder;
• a cylinder wall provided in the cylinder and defining a motion limit of the piston;
• and a rod part connecting the piston and the other of the thigh joint part and the lower leg part, the rotational resistance applicator being structured to apply a resistance by the working fluid according to a position of the piston in the cylinder to relative rotation of the thigh joint part and the lower leg part;
• and
• a functional component that is stored inside the cylinder wall and controls the resistance applied by the rotational resistance applicator according to a phase of walking of a user.

A prosthetic limb comprising:

• a thigh part;
• a thigh joint part provided on the thigh part side;
• a lower leg part rotatably connected to the thigh joint part via at least one rotation shaft;
• a cylinder fixed to one of the thigh joint part and the lower leg part and filled with a working fluid;
• a piston provided movably between the thigh joint part side and the lower leg part side in the cylinder;
• a cylinder wall provided in the cylinder and defining a motion limit of the other side of the thigh joint part and the lower leg part of the piston;
• a piston rod extending from the piston toward the other of the thigh joint part and the lower leg part and penetrating the cylinder wall;
• and
• a connecting rod that connects the piston rod to the other of the thigh joint part and the lower leg part and is connected to the piston rod at a connecting part that is separated by a predetermined distance or more from the other end of the other side of the thigh joint part and the lower leg part on the piston rod toward one end on the piston side, wherein
• when the piston is at a limit position of one side of the thigh joint part and the lower leg part, the connecting part of the connecting rod and the piston rod is positioned between the cylinder wall and the piston.

A prosthetic limb comprising:

• a thigh part;
• a thigh joint part provided on the thigh part side;
• a lower leg part rotatably connected to the thigh joint part via at least one rotation shaft;
• a rotational resistance applicator including:
• a cylinder fixed to one of the thigh joint part and the lower leg part and filled with a working fluid;
• a piston provided movably between the thigh joint part side and the lower leg part side in the cylinder;
• a cylinder wall provided in the cylinder and defining a motion limit of the piston;
• and a rod part connecting the piston and the other of the thigh joint part and the lower leg part, the rotational resistance applicator being structured to apply a resistance by the working fluid according to a position of the piston in the cylinder to relative rotation of the thigh joint part and the lower leg part;
• and
• a functional component that is stored inside the cylinder wall and controls the resistance applied by the rotational resistance applicator according to a phase of walking of a user.