A packaged system for treating a vascular condition, the system comprising: a treatment unit defining a proximal end opposite a distal end, the treatment unit including: a catheter defining a lumen, wherein the lumen is open to the distal end, an interventional coronary device carried by the catheter and arranged proximate the distal end; and a protection unit (32, 232, 432A-H) including: a sheath (50, 250, 450, 520, 580, 700, 750) defining a proximal side (70, 270, 470, 716, 760) and a distal side (72, 272, 472, 718, 762), a stylet (52, 252, 452, 522, 582, 652, 702, 752) defining a proximal region (80, 280, 480, 730, 780), a distal region (84, 284, 484, 542, 602, 672, 734, 784), and an intermediate region (82, 282, 482, 540, 600, 670, 732, 782) between the proximal and distal regions; wherein the packaged system is configured to provide a storage state in which: the sheath is disposed over the interventional coronary device, the intermediate region of the stylet is disposed within the lumen and the distal region extends distally beyond the distal end, and the sheath (50, 250, 450, 520, 580, 700, 750) is mechanically connected to the stylet, wherein the sheath defines a slit (74, 278, 476, 534, 594, 720) through a side wall of the sheath and extending to a slit distal end, the slit distal end terminating proximal the distal side, or extending to the distal side; and further wherein the storage state includes a portion of the distal region projecting through the slit. a treatment unit defining a proximal end opposite a distal end, the treatment unit including: a catheter defining a lumen, wherein the lumen is open to the distal end, an interventional coronary device carried by the catheter and arranged proximate the distal end; and a catheter defining a lumen, wherein the lumen is open to the distal end, an interventional coronary device carried by the catheter and arranged proximate the distal end; and a protection unit (32, 232, 432A-H) including: a sheath (50, 250, 450, 520, 580, 700, 750) defining a proximal side (70, 270, 470, 716, 760) and a distal side (72, 272, 472, 718, 762), a stylet (52, 252, 452, 522, 582, 652, 702, 752) defining a proximal region (80, 280, 480, 730, 780), a distal region (84, 284, 484, 542, 602, 672, 734, 784), and an intermediate region (82, 282, 482, 540, 600, 670, 732, 782) between the proximal and distal regions; a sheath (50, 250, 450, 520, 580, 700, 750) defining a proximal side (70, 270, 470, 716, 760) and a distal side (72, 272, 472, 718, 762), a stylet (52, 252, 452, 522, 582, 652, 702, 752) defining a proximal region (80, 280, 480, 730, 780), a distal region (84, 284, 484, 542, 602, 672, 734, 784), and an intermediate region (82, 282, 482, 540, 600, 670, 732, 782) between the proximal and distal regions; wherein the packaged system is configured to provide a storage state in which: the sheath is disposed over the interventional coronary device, the intermediate region of the stylet is disposed within the lumen and the distal region extends distally beyond the distal end, and the sheath (50, 250, 450, 520, 580, 700, 750) is mechanically connected to the stylet, the sheath is disposed over the interventional coronary device, the intermediate region of the stylet is disposed within the lumen and the distal region extends distally beyond the distal end, and the sheath (50, 250, 450, 520, 580, 700, 750) is mechanically connected to the stylet, wherein the sheath defines a slit (74, 278, 476, 534, 594, 720) through a side wall of the sheath and extending to a slit distal end, the slit distal end terminating proximal the distal side, or extending to the distal side; and further wherein the storage state includes a portion of the distal region projecting through the slit.