Patent ID: 8641604

Claim:
A steering system for a steerable device having a deflectable insertion shaft through which at least first and second steering wires are routed, the steering system comprising: first and second drive members having an axis of rotation and adapted to be coupled to the first and second steering wires for effecting movement of the first and second steering wires, respectively; a first lock member associated with the first drive member, the first lock member moveable between an unlocked position, wherein the first drive member is freely movable to effect movement on the first steering wire, and a locked position, wherein the first drive member is prohibited from effecting movement on the first steering wire; and a second lock member associated with the second drive member and movable independently of the first lock member, the second lock member movable between an unlocked position, wherein the second drive member is movable to effect movement on the second steering wire, and a locked position, wherein the second drive member is prohibited from effecting a movement on the second steering wire; wherein the first lock member includes a first brake arm configured to deflect radially outwardly relative to the axis of rotation when the first lock member is moved to lock the first drive member; and wherein a frictional engagement between a radially outward facing surface of the first brake arm and a radially inward facing surface of the first drive member causes a radially directed force sufficient to arrest movement of the first drive member, further comprising a first cam member having a first cam configured to engage with a first notch on the first brake arm, wherein rotation of the first cam member causes the first brake arm to deflect radially outward.