Guide Wire Transition Grooves for Torque Transmission

The patent applies parameter changes by modifying the cross-sectional shape parameters along the guide wire length. The core portion transitions from a circular cross-section to an oval cross-section with controlled aspect ratios. Specifically, the first transition portion has an oval cross-section with a long diameter gradually changing from the circular diameter to a larger value, while the second transition portion has an oval cross-section with a long diameter gradually changing from the larger value to the plate width. This gradual parameter change ensures smooth rigidity transition without sudden changes that would cause twisting or buckling.

The patent applies dynamics by creating a dynamic gradient in the cross-sectional shape along the guide wire. The oval cross-section portions provide intermediate states between the circular main body and the flat plate, allowing progressive adaptation of rigidity. This dynamic transition structure enables the guide wire to maintain torquability while achieving reshaping capability, as the gradual shape change prevents sudden twisting moments that would occur with abrupt transitions.

The patent applies local quality by creating different cross-sectional shapes at different locations along the guide wire. The main body portion has a circular cross-section providing high rigidity for pushing force transmission, while the distal portion has a flat plate configuration providing flexibility for blood vessel followability. The transition portions have oval cross-sections that provide intermediate rigidity, ensuring smooth force transmission without buckling. This localized differentiation of structural properties resolves the contradiction between flexibility and force transmission.