Tri-curve elongate medical device

An elongate medical device comprising:

• a shaft comprising a distal end portion and a proximal end portion, wherein the shaft has an axis from the proximal end portion to the distal end portion;
• and
• a handle assembly coupled to the shaft, the handle assembly comprising:
• a first manipulation mechanism configured to deflect the shaft in a first manner and in a predetermined direction relative to the axis;
• and
• a second manipulation mechanism configured to deflect the shaft in a second manner in substantially the same predetermined direction relative to the axis,
• where the first manipulation mechanism is coupled with a first deflection wire assembly and the second manipulation mechanism is coupled with a second deflection wire assembly, where the first deflection wire assembly deflects the shaft at a first curve radius and the second deflection wire assembly deflects the shaft at a second curve radius, and
• wherein each of the first and the second deflection wire assemblies comprises a flat wire, each flat wire having a distal end, wherein the distal ends of the flat wires are coupled to a common location of the distal end portion of the shaft, further wherein each flat wire has a respective length that is different from each other flat wire, wherein the respective length of each flat wire defines a respective radius of deflection of the distal end portion of the shaft.