A steering mechanism for use as part of a medical device, comprising: an elongate housing adapted to be coupled to a steerable member of a medical device; and an actuation system coupled to the elongate housing, the actuation system adapted to control movement of the steerable member of the medical device within a body of a patient, the actuation system including an actuator , a first cam , and a second cam , the actuator adapted to move the first cam from a first position of the first cam to a second position of the first cam of the first cam different than the first position of the first cam when the actuator is moved in a first direction along a first axis, the first cam adapted to move the steerable member of the medical device in a first steerable member direction along a first plane when the first cam is moved from the first position of the first cam to the second position of the first cam , the actuator adapted to move the second cam from a first position of the second cam to a second position of the second cam different than the first position of the second cam when the actuator is moved in a first direction along a second axis different than the first axis, the second cam adapted to move the steerable member of the medical device in a first steerable member direction along a second plane when the second cam is moved from the first position of the second cam to the second position of the second cam ; and a protrusion coupled to the first cam , the protrusion adapted to move in a first protrusion direction when the actuator is moved in its first direction along the second axis, the protrusion adapted to engage a recess within the second cam as the protrusion is moved in the first protrusion direction. an elongate housing adapted to be coupled to a steerable member of a medical device; and an actuation system coupled to the elongate housing, the actuation system adapted to control movement of the steerable member of the medical device within a body of a patient, the actuation system including an actuator , a first cam , and a second cam , the actuator adapted to move the first cam from a first position of the first cam to a second position of the first cam of the first cam different than the first position of the first cam when the actuator is moved in a first direction along a first axis, the first cam adapted to move the steerable member of the medical device in a first steerable member direction along a first plane when the first cam is moved from the first position of the first cam to the second position of the first cam , the actuator adapted to move the second cam from a first position of the second cam to a second position of the second cam different than the first position of the second cam when the actuator is moved in a first direction along a second axis different than the first axis, the second cam adapted to move the steerable member of the medical device in a first steerable member direction along a second plane when the second cam is moved from the first position of the second cam to the second position of the second cam ; and a protrusion coupled to the first cam , the protrusion adapted to move in a first protrusion direction when the actuator is moved in its first direction along the second axis, the protrusion adapted to engage a recess within the second cam as the protrusion is moved in the first protrusion direction. <EOS>