External fixator for immobilizing bone fragments, particularly in the area of the wrist

An external fixator for immobilizing bone parts comprising a longitudinally extending, two pin-holder assemblies which can be moved relative to this bar, and means for immobilizing each pin-holder assembly in a defined position relative to the bar;

• wherein:
• the bar has a cylindrical main part and a spherical part at one end of the bar;
• a first pin-holder assembly of the two pin-holder assemblies comprises a one-piece body with a bore passing through it to permit its engagement by sliding on the cylindrical part of the bar;
• and
• a second pin-holder assembly of the two pin-holder assemblies comprises a one-piece body in which a recess is formed, this recess having a zone of partially spherical shape with a radius slightly greater than that of said spherical part, this zone being such that it can receive this spherical part with pivoting, without lateral play, and with a possibility of articulation of said second pin-holder assembly, the one-piece body of the second pin-holder assembly being configured to receive at least one pin such that the at least one pin extends through the one-piece body at a same longitudinal position as the recess.