Medical devices and instruments, namely, medical devices and instruments for the removal of plaque and blockage from a blood vessel and/or widening of blood vessels narrowed by disease, kits comprising medical devices and instruments for the removal of plaque and blockage from a blood vessel and/or widening of blood vessels narrowed by disease and instructions sold therewith, and parts and fittings for all of the foregoing medical devices and instruments; medical devices and instruments, namely, medical devices and instruments for endovascular procedures, kits comprising medical devices and instruments for endovascular procedures and instructions sold therewith, and parts and fittings for all of the foregoing medical devices and instruments; atherectomy catheters