Process for producing the actuation part of an instrument (1, 203, 204) for endoscopic applications or the like, this instrument (1, 203, 204) comprises a tube-like element with a terminal manipulation part (21, 41, 141, 161) with a flexible part (22, 42, 142, 162) and actuation means (25, 45, 145,165) located in an actuating terminal part, characterized in that the tube-like element comprises three coaxial cylindrical members ( 2, 3, 4), that is an internal cylindrical member (2), an intermediate cylindrical member (3), and an external cylindrical member (4), wherein the intermediate cylindrical member (3) comprises a cylindrical part (31, 151 ) connected to the manipulation terminal part (21, 41, 141, 161), a cylindrical part (35,155) connected to the actuation means (25, 45, 145, 165) and several longitudinal elements (38, 60, 70, 80 , 90, 100, 110, 130) separated by longitudinal grooves for the transfer of movement d the actuating means (25, 45, 145, 165) to the handling terminal part (21, 41, 141, 161), and where the intermediate cylindrical member (3) is made by injection molding or cover techniques or starting of a complete cylindrical tube having a number of longitudinal grooves thus forming the longitudinal elements (38, 60, 70, 80, 90, 100, 110, 130), where at least one longitudinal groove between a pair of nearby longitudinal elements ( 38, 60, 70, 80, 90, 100, 110, 130) is formed with elements (66, 72, 83, 96, 97, 106, 107,113) having the longitudinal elements (38, 60, 70, 80, 90, 100, 110, 130, 134, 135, 136) parallel to each other, and where after assembling the tube-like element, through which the inner cylindrical member (2) is inserted into the intermediate cylindrical member (3) and the member Combined internal cylindrical (2) and intermediate cylindrical member (3) are inserted into the external cylindrical member (4), terminal faces of l The three cylindrical members connected to each other to each other to have an integral unit.Proceso para prod
