A steerable device comprising: a tubular sheath (10, 110, 210, 310) comprising: a proximal end (110 P, 210 P, 310 P); a distal end (110 D, 210 D, 310 D) opposite the proximal end (110p, 210p, 310p); and at least one reconfigurable section disposed intermediate the proximal (110 P, 210 P, 310p) and distal (110 D, 210 D, 310 D) ends and possessive of an increased flexibility, the at least one reconfigurable section comprising at least one helical slot (12, 112, 212, 312) formed through the wall (14, 114, 214, 314) of the sheath (10, 110, 210, 310), the at least one helical slot (12, 112, 212, 312) defining a pitch along the axial dimension of the tubular sheath (10, 110, 210, 310); and an elongate control element (120, 220, 320) defining a proximal end and a distal end, the elongate control element (120, 220, 320) centrally disposed along the axial dimension of the tubular sheath (10, 110, 210, 310) and attached to at least one part of the tubular sheath (10, 110, 210, 310) in order to enable an operator to impose an axial force to the elongate control element (120, 220, 320) that causes a relative tangential rotation between adjacent wall sections that define the helical slot (12, 112, 212, 312), resulting in a known, limited, controllable torsional rotation of the distal end (110 D, 210 D, 310 D) of the tubular sheath (10, 110, 210, 310) without torsional rotation of the proximal end (110 P, 210 P, 310 P) of the tubular sheath (10, 110, 210, 310). a tubular sheath (10, 110, 210, 310) comprising: a proximal end (110 P, 210 P, 310 P); a distal end (110 D, 210 D, 310 D) opposite the proximal end (110p, 210p, 310p); and at least one reconfigurable section disposed intermediate the proximal (110 P, 210 P, 310p) and distal (110 D, 210 D, 310 D) ends and possessive of an increased flexibility, the at least one reconfigurable section comprising at least one helical slot (12, 112, 212, 312) formed through the wall (14, 114, 214, 314) of the sheath (10, 110, 210, 310), the at least one helical slot (12, 112, 212, 312) defining a pitch along the axial dimension of the tubular sheath (10, 110, 210, 310); and a proximal end (110 P, 210 P, 310 P); a distal end (110 D, 210 D, 310 D) opposite the proximal end (110p, 210p, 310p); and at least one reconfigurable section disposed intermediate the proximal (110 P, 210 P, 310p) and distal (110 D, 210 D, 310 D) ends and possessive of an increased flexibility, the at least one reconfigurable section comprising at least one helical slot (12, 112, 212, 312) formed through the wall (14, 114, 214, 314) of the sheath (10, 110, 210, 310), the at least one helical slot (12, 112, 212, 312) defining a pitch along the axial dimension of the tubular sheath (10, 110, 210, 310); and an elongate control element (120, 220, 320) defining a proximal end and a distal end, the elongate control element (120, 220, 320) centrally disposed along the axial dimension of the tubular sheath (10, 110, 210, 310) and attached to at least one part of the tubular sheath (10, 110, 210, 310) in order to enable an operator to impose an axial force to the elongate control element (120, 220, 320) that causes a relative tangential rotation between adjacent wall sections that define the helical slot (12, 112, 212, 312), resulting in a known, limited, controllable torsional rotation of the distal end (110 D, 210 D, 310 D) of the tubular sheath (10, 110, 210, 310) without torsional rotation of the proximal end (110 P, 210 P, 310 P) of the tubular sheath (10, 110, 210, 310).