A system for treating tissues, comprising: an insertion device, the insertion device including a port, a camera, and a working channel extending therethrough along a longitudinal axis; and a tissue treating device (10, 400) comprising: a control wire/insertion section combination including a flexible insertion section (14, 414) extending from a distal end which, during use is inserted to a target site within a living body to a proximal end which, during use remains outside the body; and a control wire (26, 108, 308, 426) received within the insertion section (14, 414) and extending from a proximal end coupled to an actuator, the control wire/insertion section combination including a bend (50, 450) in a distal portion thereof configured so that, in a resting state, the control wire (26, 108, 308, 426) and the insertion section (14, 414) bend through a predetermined arc at a selected bending radius, a distal portion of the control wire (26, 108, 308, 426) being configured to pass into and through the working channel of the insertion device without plastic deformation of the control wire (26, 108, 308, 426); an end effector coupled to a distal end of the insertion section (14, 414); and characterised in that the system comprises: an elevator at a distal end of the insertion device that changes the bend (50, 450) of the control wire/insertion section combination. an insertion device, the insertion device including a port, a camera, and a working channel extending therethrough along a longitudinal axis; and a tissue treating device (10, 400) comprising: a control wire/insertion section combination including a flexible insertion section (14, 414) extending from a distal end which, during use is inserted to a target site within a living body to a proximal end which, during use remains outside the body; and a control wire (26, 108, 308, 426) received within the insertion section (14, 414) and extending from a proximal end coupled to an actuator, the control wire/insertion section combination including a bend (50, 450) in a distal portion thereof configured so that, in a resting state, the control wire (26, 108, 308, 426) and the insertion section (14, 414) bend through a predetermined arc at a selected bending radius, a distal portion of the control wire (26, 108, 308, 426) being configured to pass into and through the working channel of the insertion device without plastic deformation of the control wire (26, 108, 308, 426); an end effector coupled to a distal end of the insertion section (14, 414); and characterised in that the system comprises: an elevator at a distal end of the insertion device that changes the bend (50, 450) of the control wire/insertion section combination. a control wire/insertion section combination including a flexible insertion section (14, 414) extending from a distal end which, during use is inserted to a target site within a living body to a proximal end which, during use remains outside the body; and a control wire (26, 108, 308, 426) received within the insertion section (14, 414) and extending from a proximal end coupled to an actuator, the control wire/insertion section combination including a bend (50, 450) in a distal portion thereof configured so that, in a resting state, the control wire (26, 108, 308, 426) and the insertion section (14, 414) bend through a predetermined arc at a selected bending radius, a distal portion of the control wire (26, 108, 308, 426) being configured to pass into and through the working channel of the insertion device without plastic deformation of the control wire (26, 108, 308, 426); a flexible insertion section (14, 414) extending from a distal end which, during use is inserted to a target site within a living body to a proximal end which, during use remains outside the body; and a control wire (26, 108, 308, 426) received within the insertion section (14, 414) and extending from a proximal end coupled to an actuator, the control wire/insertion section combination including a bend (50, 450) in a distal portion thereof configured so that, in a resting state, the control wire (26, 108, 308, 426) and the insertion section (14, 414) bend through a predetermined arc at a selected bending radius, a distal portion of the control wire (26, 108, 308, 426) being configured to pass into and through the working channel of the insertion device without plastic deformation of the control wire (26, 108, 308, 426); an end effector coupled to a distal end of the insertion section (14, 414); and characterised in that the system comprises: an elevator at a distal end of the insertion device that changes the bend (50, 450) of the control wire/insertion section combination.