A method for manufacturing a steerable instrument for endoscopic and/or invasive type applications, such as in surgery, the instrument comprising an elongated tubular body having a proximal end part, a distal end part and an intermediate part between proximal and distal end parts, the proximal end part having at least one actuation proximal zone (14, 15), the distal end part having at least one flexible distal zone (16, 17), and the elongated tubular body being configured such that a movement of an actuation proximal zone is transferred to a corresponding flexible distal zone for a corresponding movement thereof, the elongated tubular body comprising an inner cylindrical element, an outer cylindrical element and at least one intermediate cylindrical element (102, 103) having longitudinal elements (4, 2338) and provided between the inner and outer cylindrical elements, the inner, outer and intermediate cylindrical elements being coupled such that movement of an actuation proximal zone (14, 15) is transferred by the longitudinal elements of one of the intermediate cylindrical elements toa corresponding flexible distal zone (16, 17), the method comprising - providing the inner and outer cylindrical elements (101, 104); - providing an intermediate cylindrical element (102, 103) such that adjacent longitudinal elements are attached to one another at one or more positions distributed along a length of the longitudinal elements (4, 2338) by one or more attachments arranged to restrict movement of the longitudinal elements in a radial direction of the intermediate cylindrical element; and - incorporating the intermediate cylindrical element between the inner and outer cylindrical elements (101, 104), wherein the one or more attachments are releasable attachments and the method comprises - releasing the releasable attachments to allow relative movement of the longitudinal elements with respect to one another in a longitudinal direction of the longitudinal elements, the releasable attachments comprising fracture elements configured to allow fracture thereof for releasing the releasable attachment the fracture elements being fractured after having incorporated the intermediate cylindrical element (102, 103) between inner and outer cylindrical elements (101, 104) by applying a force onto adjacent longitudinal elements such as to induce movement of the longitudinal elements (4, 2338) with respect to one another and to fracture the fracture elements, optionally the fracture elements being shaped such as to provide one or more predetermined fracture locations (7.1) where the fracture elements will fracture upon application of a suitable force. - providing the inner and outer cylindrical elements (101, 104); - providing an intermediate cylindrical element (102, 103) such that adjacent longitudinal elements are attached to one another at one or more positions distributed along a length of the longitudinal elements (4, 2338) by one or more attachments arranged to restrict movement of the longitudinal elements in a radial direction of the intermediate cylindrical element; and - incorporating the intermediate cylindrical element between the inner and outer cylindrical elements (101, 104), wherein the one or more attachments are releasable attachments and the method comprises - releasing the releasable attachments to allow relative movement of the longitudinal elements with respect to one another in a longitudinal direction of the longitudinal elements, the releasable attachments comprising fracture elements configured to allow fracture thereof for releasing the releasable attachment the fracture elements being fractured after having incorporated the intermediate cylindrical element (102, 103) between inner and outer cylindrical elements (101, 104) by applying a force onto adjacent longitudinal elements such as to induce movement of the longitudinal elements (4, 2338) with respect to one another and to fracture the fracture elements, optionally the fracture elements being shaped such as to provide one or more predetermined fracture locations (7.1) where the fracture elements will fracture upon application of a suitable force.