The present invention provides a device (1) for locking and unlocking an elongate tubular element (2), the device comprising: a. A braided or knitted tubular locking sleeve (3) that has a first end (3a) and a second end (3b), and that has an inlet orifice (4) for allowing said elongate tubular element (2) into it, and an outlet orifice (5) for allowing said elongate tubular element (2) out of it; b. Fastener means (6) for fastening said locking sleeve (3) to a support (7); and c. Tensioner means (8) for tensioning said locking sleeve (3) along a substantially rectilinear path (L) making it possible to lock said elongate tubular element (2) inside said locking sleeve (3) between said inlet orifice (4) and said outlet orifice (5), said tensioner means (8) being deactivatable manually, and/or by using deactivation means (9), for unlocking said elongate tubular element (2) to enable it to slide inside the internal volume of the locking sleeve (3) and through said inlet orifice (4) and said outlet orifice (5).