Artificial hand

A hand prosthesis comprising a palm member, index finger means pivotably connected to said palm member for pivoting round a finger turning point, a thumb rigidly attached to said palm member in a position opposing the pivotal movement of the index finger means and having a length and location corresponding to those of a natural hand, and arranged within said palm member,

• a carcase to which said palm member is pivotably connected round a wrist turning point and adapted to be attached to a forearm,
• electric motor means provided at said plan member oriented perpendicular to said forearm and being positioned slightly below the juncture of said thumb and said palm, said electric motor means being provided with gear means,
• a link assembly extending from said wrist turning point to said finger turning point, to a turning point provided on said index finger means spaced from said finger turning point, an additional link and from there back to said carcase,
• a finger drive link operatively connected between said link assembly and said gear means to move, upon rotation of said electric motor means, said link assembly so as to move said index finger means relative to said thumb in a natural gripping movement pattern such that when said index finger means is rotating round said finger turning point in one direction said finger turning point is concomitantly rotated round said wrist turning point in an opposite direction, and
• said link assembly comprising said additional link pivotably mounted at one end thereof to said finger drive link and at an opposite end to said carcase round a further turning point spaced from said wrist turning point, whereby said finger drive link is pivotably mounted to said gear means at one end thereof and to said index finger means round a turning point spaced from said finger turning point at its opposite end.