Abstract: The disclosure includes an arrangement for a handle for a catheter system that includes a first member and a second member. The handle can include a screw member positioned within the handle and configured for rotation about an axis. The screw member can include an internal thread. A carriage can be positioned within the screw member. The carriage can engage the internal thread and can be coupled to the first member. An alignment member can extend within the screw member to limit rotation of the carriage about the axis as the screw member is rotated. Rotation of the screw member in a first direction about the axis can cause the carriage to move in a first longitudinal direction within the screw member causing the first member to move in the first longitudinal direction relative to the handle.