Steerable Loop Tip Wire-Guide Navigation

The patent inverts the conventional straight tip design by using a loop tip configuration. The loop tip wire-guide (reference 10) reverses the expected behavior of a straight tip by creating a loop structure that naturally resists bending toward vessel walls. When the loop tip encounters an impediment, the loop deforms in response while the distal end remains stable, creating a force that directs the wire-guide away from the impediment rather than allowing it to turn back.

The patent applies curvature by forming a loop tip instead of using a straight configuration. The loop tip (reference 22) creates a curved geometry that provides mechanical advantage when navigating tortuous paths. The curved loop structure distributes stress and prevents the wire-guide from sharply bending toward vessel walls, enabling smoother navigation through complex vessel geometries.

The patent segments the wire-guide into multiple functional sections: a loop tip portion (reference 14) for stable navigation around impediments, and a body portion (reference 18) containing control mechanisms. This segmentation allows the distal loop tip to maintain stability while the proximal body portion provides steering control through movable elements, enabling independent optimization of both navigation stability and steering capability.

The patent introduces dynamic elements to the wire-guide body portion, including movable wires or shape memory alloy sections that can actively change the wire-guide's configuration. This dynamic capability allows the operator to steer the wire-guide into desired branches or bifurcations by actuating the movable elements, while the loop tip maintains its stable navigation characteristics.