#$%^&*AU2017275383A120180726.pdf#####ABSTRACT This disclosure is directed to a catheter having a multi-electrode assembly with a high electrode density. The multi-electrode assembly may be a basket-shaped electrode assembly or a brush-shaped electrode assembly each having a plurality of spines. Each spine includes a flexible wire core of a shape memory material. The flexible wires may have a folding line that provides a controlled folding mechanism for collapsing the expanded electrode assembly into a delivery configuration.1/4 (0 CNI IC,C%4