Mechanical hand

A method of operating a mechanical hand, the method comprising:

• applying a force to move a thumb assembly of the hand and send an input signal from a selector comprising at least one switch or sensor to a controller responsive to the forced movement of the thumb assembly;
• and
• selecting a desired thumb rotational position or grip to be defined by a plurality of finger assemblies and the thumb assembly of the hand responsive to the input signal;
• wherein:
• each finger assembly is selectively moveable by a respective finger drive assembly about a finger pivot axis along a finger flexion/extension plane and between a finger open position and a finger closed position;
• the thumb assembly is selectively rotatable by a first thumb drive assembly about a first thumb axis between an opposed position and a non-opposed position with respect to the finger assemblies, and is selectively moveable by a second thumb drive assembly about a second thumb axis along a thumb flexion/extension plane and between a thumb open position and a thumb closed position;
• the thumb assembly is selectively moveable about a third thumb axis;
• the thumb assembly is mounted on a thumb rocker member coupled to the first thumb drive assembly and rotatable about the third thumb axis;
• and
• the controller is operatively coupled to the finger and thumb drive assemblies.