A medical device (10, comprising: a catheter body having a first portion with a first plane of preferential bending, and a second portion with a second plane of preferential bending; the first portion being distal of the second portion; a steering actuator coupled to the catheter body; the medical device having a first and second mode of steering: in the first steering mode, movement of the steering actuator from an initial position causes the first portion to bend from an initial shape to a first arc shape along the first plane; and in the second steering mode, movement of the steering actuator from the initial position causes the first portion to bend from the initial shape to a second arc shape, and causes the second portion to bend along the second plane; a guide plate within the catheter body having a proximal and distal portion substantially coextensive with the first and second portions of the catheter body, respectively said proximal and distal portions being connected by a transition portion; a supplemental steering mechanism in the form of a steerable outer sheath, the outer sheath at least partially surrounding and being movable with respect to the catheter body; and a supplemental steering actuator being coupled to the outer sheath, wherein movement of the supplemental steering actuator from an initial position causes a portion of the outer sheath to bend from an initial shape to an arc shape; characterised in that the proximal portion of the guide plate has a concave section to bias the catheter body. a catheter body having a first portion with a first plane of preferential bending, and a second portion with a second plane of preferential bending; the first portion being distal of the second portion; a steering actuator coupled to the catheter body; the medical device having a first and second mode of steering: in the first steering mode, movement of the steering actuator from an initial position causes the first portion to bend from an initial shape to a first arc shape along the first plane; and in the second steering mode, movement of the steering actuator from the initial position causes the first portion to bend from the initial shape to a second arc shape, and causes the second portion to bend along the second plane; a guide plate within the catheter body having a proximal and distal portion substantially coextensive with the first and second portions of the catheter body, respectively said proximal and distal portions being connected by a transition portion; a supplemental steering mechanism in the form of a steerable outer sheath, the outer sheath at least partially surrounding and being movable with respect to the catheter body; and a supplemental steering actuator being coupled to the outer sheath, wherein movement of the supplemental steering actuator from an initial position causes a portion of the outer sheath to bend from an initial shape to an arc shape; characterised in that the proximal portion of the guide plate has a concave section to bias the catheter body. in the first steering mode, movement of the steering actuator from an initial position causes the first portion to bend from an initial shape to a first arc shape along the first plane; and in the second steering mode, movement of the steering actuator from the initial position causes the first portion to bend from the initial shape to a second arc shape, and causes the second portion to bend along the second plane; a guide plate within the catheter body having a proximal and distal portion substantially coextensive with the first and second portions of the catheter body, respectively said proximal and distal portions being connected by a transition portion; a supplemental steering mechanism in the form of a steerable outer sheath, the outer sheath at least partially surrounding and being movable with respect to the catheter body; and a supplemental steering actuator being coupled to the outer sheath, wherein movement of the supplemental steering actuator from an initial position causes a portion of the outer sheath to bend from an initial shape to an arc shape; characterised in that the proximal portion of the guide plate has a concave section to bias the catheter body.