Systems and devices for articulation wire guidance

A steering assembly of a medical device, the steering assembly comprising:

• a handle;
• first, second, and third wire guides disposed in the handle, wherein at least one of the first, the second, or the third wire guide is constrained by an axle;
• first and second wire segments configured to control movement of a sheath coupled to the handle in first and second directions;
• and
• third and fourth wire segments configured to control movement of the sheath in third and fourth directions;
• wherein:
• the first wire segment passes through a first gap between the first wire guide and the second wire guide;
• the second wire segment passes through a second gap between the first wire guide and the second wire guide;
• the third wire segment passes through a third gap between the second wire guide and the third wire guide;
• and
• the fourth wire segment passes through a fourth gap between the second wire guide and the third wire guide.

A steering assembly of a medical device, the steering assembly comprising

• first, second, and third wire guides disposed in a handle;
• a first pulley having first and second wires, wherein the first pulley is disposed between the first and second wire guides;
• and
• a second pulley having third and fourth wires, wherein the second pulley is disposed between the second and third wire guides;
• wherein the first, second, and third wire guides and first and second pulleys are stacked relative to one another to completely contain the first, second, third, and fourth wire segments in separate compartments.