A steering mechanism (110,210,310,410) for use as part of a medical device, comprising: an elongate housing (112,212,312,412) adapted to be coupled to a steerable member (102,202,302,402) of a medical device; and an actuation system (370,470) coupled to the elongate housing, the actuation system adapted to control movement of the steerable member (102,202,302,402) of the medical device within a body of a patient, the actuation system including an actuator (122,222,322,422), a first cam (330,430), and a second cam (350,450), the actuator (122,222,322,422) adapted to move the first cam (330,430) from a first position of the first cam (330,430) to a second position of the first cam of the first cam (330,430) different than the first position of the first cam (330,430) when the actuator (122,222,322,422) is moved in a first direction along a first axis, the first cam (330,430) adapted to move the steerable member (102,202,302,402) of the medical device in a first steerable member direction along a first plane when the first cam (330,430) is moved from the first position of the first cam (330,430) to the second position of the first cam (330,430), the actuator (122,222,322,422) adapted to move the second cam (350,450) from a first position of the second cam (350,450) to a second position of the second cam (350,450) different than the first position of the second cam (350,450) when the actuator (122,222,322,422) is moved in a first direction along a second axis different than the first axis, the second cam (350,450) adapted to move the steerable member (102,202,302,402) of the medical device in a first steerable member direction along a second plane when the second cam (350,450) is moved from the first position of the second cam (350,450) to the second position of the second cam (350,450); and a protrusion coupled to the first cam (330,430), the protrusion (348,448) adapted to move in a first protrusion direction when the actuator (122,222,322,422) is moved in its first direction along the second axis, the protrusion (348,448) adapted to engage a recess (356,456) within the second cam (350,450) as the protrusion (348,448) is moved in the first protrusion direction. an elongate housing (112,212,312,412) adapted to be coupled to a steerable member (102,202,302,402) of a medical device; and an actuation system (370,470) coupled to the elongate housing, the actuation system adapted to control movement of the steerable member (102,202,302,402) of the medical device within a body of a patient, the actuation system including an actuator (122,222,322,422), a first cam (330,430), and a second cam (350,450), the actuator (122,222,322,422) adapted to move the first cam (330,430) from a first position of the first cam (330,430) to a second position of the first cam of the first cam (330,430) different than the first position of the first cam (330,430) when the actuator (122,222,322,422) is moved in a first direction along a first axis, the first cam (330,430) adapted to move the steerable member (102,202,302,402) of the medical device in a first steerable member direction along a first plane when the first cam (330,430) is moved from the first position of the first cam (330,430) to the second position of the first cam (330,430), the actuator (122,222,322,422) adapted to move the second cam (350,450) from a first position of the second cam (350,450) to a second position of the second cam (350,450) different than the first position of the second cam (350,450) when the actuator (122,222,322,422) is moved in a first direction along a second axis different than the first axis, the second cam (350,450) adapted to move the steerable member (102,202,302,402) of the medical device in a first steerable member direction along a second plane when the second cam (350,450) is moved from the first position of the second cam (350,450) to the second position of the second cam (350,450); and a protrusion coupled to the first cam (330,430), the protrusion (348,448) adapted to move in a first protrusion direction when the actuator (122,222,322,422) is moved in its first direction along the second axis, the protrusion (348,448) adapted to engage a recess (356,456) within the second cam (350,450) as the protrusion (348,448) is moved in the first protrusion direction.