The device (3) has a guiding sheath (30) housing a transmission cable. A rigid element limits deformation of the sheath along a first direction perpendicular to a longitudinal axis of the sheath without deforming the sheath along a second direction that is essentially orthogonal to the first direction and to the longitudinal axis. The rigid element is fixedly attached to the sheath, where quadratic moment of the rigid element is relative to the first direction being smaller than the quadratic moment of the rigid element relative to the second direction. The rigid element is made of a metallic material i.e. flat iron, plastic material or composite material. An independent claim is also included for a farming implement.Linvention concerne un dispositif de transmission souple (3) comprenant une gaine de guidage (30) logeant un câble de transmission.Selon linvention, un tel dispositif comprend des moyens de rigidification (35) pour limiter la déformation de ladite gaine (30) le long dune première direction (D1) perpendiculaire à laxe longitudinal (Δ) de ladite gaine (30) sans prévenir la déformation de celle-ci le long dune deuxième direction (D2) essentiellement orthogonal à ladite première direction (D1) et audit axe longitudinal (Δ), les moyens de rigidification (35) étant solidaires de la gaine (30).
