Artificial hand with retractable thumb - has hand extension linkage connected to thumb piston

摘要

The artificial hand has a thumb (1) digit which may be at least partially withdrawn into the body of the hand (4) or into the thumb cylinder (3) when the hand is extended or opened. The remaining fingers may be rotated away from the thumb in such a way that a large open palm grip space extending inwards to the inner hand surface is formed. The central anchorage of the hand is provided at the bone of one thumb cylinder (3) or thumb piston (1) with a magnetic actuator.