Patent ID: 7563287

Claim:
Wrist prosthesis comprising a plurality of rigid rods, including a central rod intended to be anchored in the radius and two lateral rods in two separate pieces intended to be anchored in metacarpals, and an articulation mechanism connecting the said rods, wherein said articulation mechanism comprises three rigid elements, a first one of which is connected to the central rod, the second and third ones of which are rigidly secured respectively to one of said lateral rods, said articulation mechanism further comprising means for elastically assembling said elements so as to allow movements of said rods when anchored in the radius and metacarpals, respectively, these movements comprising movements of the lateral rods with respect to the central rod and relative movements of the lateral rods with respect to each other, wherein the first element of said articulation mechanism is a seat made from a rigid material with two front faces and with a transverse bore, the second and third elements respectively are each a base of said lateral rods, wherein each base of said lateral rods comprises a transverse passage and a front surface, and wherein the mechanism further comprises a spindle made from an elastically deformable and extensible material with a central part traversing said transverse bore of the seat and two ends each traversing one of said transverse passages of the bases, said spindle being held in extension by locking of said ends in the transverse passages in the bases by locks so that the said front surfaces of the bases are pressed against the front faces of the seat so as to constitute articulations of the swivel type allowing limited relative movements of the lateral rods with respect to the seat.