A control handle for a medical device having an elongated body, a distal assembly distal the elongated body, the distal assembly having an adjustable configuration, the medical device further comprising a puller member extending through the elongated body and the distal assembly, the control handle comprising: a housing; and an actuator assembly comprising: first and second knobs jointly movable for a predetermined distance relative to the housing; and a body to which a proximal end of the puller member is fixed; characterized in that the housing is configured with a first incline and a second incline, and wherein the actuator assembly comprises: a first arm extending between the first knob and the body, the first arm having an outer end coupled to the first knob and an inner end coupled to the body; and a second arm extending between the second knob and the body, the second arm having an outer end coupled to the second knob and an inner end coupled to the body, wherein the body is movably suspended by the first and second arms, and the first and second knobs actuate the outer ends of the first and second arms to move along the first incline and the second incline respectively in varying a separation distance between the outer ends so that the puller wire travels a greater distance than the predetermined distance for adjusting the configuration of the distal assembly. a housing; and an actuator assembly comprising: first and second knobs jointly movable for a predetermined distance relative to the housing; and a body to which a proximal end of the puller member is fixed; characterized in that the housing is configured with a first incline and a second incline, and wherein the actuator assembly comprises: a first arm extending between the first knob and the body, the first arm having an outer end coupled to the first knob and an inner end coupled to the body; and a second arm extending between the second knob and the body, the second arm having an outer end coupled to the second knob and an inner end coupled to the body, first and second knobs jointly movable for a predetermined distance relative to the housing; and a body to which a proximal end of the puller member is fixed; characterized in that the housing is configured with a first incline and a second incline, and wherein the actuator assembly comprises: a first arm extending between the first knob and the body, the first arm having an outer end coupled to the first knob and an inner end coupled to the body; and a second arm extending between the second knob and the body, the second arm having an outer end coupled to the second knob and an inner end coupled to the body, a first arm extending between the first knob and the body, the first arm having an outer end coupled to the first knob and an inner end coupled to the body; and a second arm extending between the second knob and the body, the second arm having an outer end coupled to the second knob and an inner end coupled to the body, wherein the body is movably suspended by the first and second arms, and the first and second knobs actuate the outer ends of the first and second arms to move along the first incline and the second incline respectively in varying a separation distance between the outer ends so that the puller wire travels a greater distance than the predetermined distance for adjusting the configuration of the distal assembly.