Basket catheter with cloverleaf structure to prevent buckling and retention feature for electrodes

A medical probe, comprising:

• a tubular shaft including a proximal end and a distal end, the tubular shaft extending along a longitudinal axis of the medical probe;
• and
• an expandable basket assembly coupled to the distal end of the tubular shaft, the basket assembly comprising:
• a plurality of spines extending along the longitudinal axis from a proximal central spine portion to a distal spine portion, the distal spine portion defining a cloverleaf structure disposed radially around the longitudinal axis, the cloverleaf structure defining a central cutout with a central area disposed about the longitudinal axis, the cloverleaf structure comprising:
• a sinusoidal-like member extending from one spine to an adjacent spine in a direction around the longitudinal axis, the sinusoidal-like member meanders around:
• (a) a first virtual circle having a first open area of approximately 20% that of the central area, the first virtual circle having its center located at a first distance to the longitudinal axis,
• (b) a second virtual circle having a second open area of approximately 90% of the first open area, the second virtual circle having its center located at a second distance smaller than the first distance to the longitudinal axis, and
• (c) a third virtual circle having its third open area approximately equal to the first open area, the third virtual circle having its center located at a third distance approximately equal to the first distance to the longitudinal axis.