Rotational atherectomy devices and methods

A rotational atherectomy system for removing stenotic lesion material from a pedal artery or coronary artery of a patient, comprising:

• a 4-French introducible rotational atherectomy device, comprising:
• a torque-transmitting coil of one or more filars that are helically wound around in a filar wind direction from a distal end to a proximal end to define a coil diameter and a drive shaft axis;
• and
• a series of abrasive burrs fixedly mounted to a distal end portion of the torque-transmitting coil and having a maximum burr diameter of no greater than 1.25 mm, wherein the series of abrasive burrs includes a distal concentric abrasive burr coaxially mounted to a distal-most end of the torque-transmitting coil, a proximal concentric abrasive burr having the same size as the distal concentric abrasive burr and being coaxially mounted to the torque-transmitting coil at a position no greater than 0.5-inches from the distal-most end of the torque-transmitting coil, and an intermediate eccentric abrasive burr having a larger size than the distal and proximal concentric abrasive burrs and being mounted to the torque-transmitting coil with a center of mass offset from the drive shaft axis;
• and
• a rotational atherectomy handle assembly coupled to the proximal end of the torque-transmitting coil and housing an electric motor configured to, responsive to user input at an actuator of the rotational atherectomy handle assembly, drive rotation of the series of abrasive burrs about the drive shaft axis in a rotational direction;
• and
• a sheath that extends from the rotational atherectomy handle assembly and over the torque transmitting coil, wherein the actuator of the rotational atherectomy handle assembly is configured to longitudinally adjust the torque-transmitting coil relative to the sheath such that, in a proximal position, the series of abrasive burrs are housed within a distal-most end of the sheath,
• wherein responsive to distal longitudinal movement of the actuator of the rotational atherectomy handle, the series of abrasive burrs are adjusted to a distal position so as to extend distally from the distal-most end of the sheath,
• wherein the electric motor housed within the rotational atherectomy handle is prevented from rotating the torque-transmitting coil when the series of abrasive burrs are in the proximal position and housed within the distal-most end of the sheath,
• wherein when the series of abrasive burrs are adjusted to the distal position to extend distally from the distal-most end of the sheath, a switch that is housed within the rotational atherectomy handle is triggered and the electric motor is selectively activatable to drive rotation of the series of abrasive burrs,
• wherein when the actuator of the rotational atherectomy handle assembly is adjusted to a location proximal of a threshold position along an upper face of the rotational atherectomy handle assembly, the series of abrasive burrs are in the proximal position and housed within the distal-most end of the sheath;
• and
• a power button at the rotational atherectomy handle assembly that is selectable to activate the electric motor, wherein the electric motor remains disengaged responsive to selection of the power button with the series of abrasive burrs in the proximal position.