Rotational atherectomy device with fluid inflatable support elements and two torque transmitting coils

A method of using a rotational atherectomy device for removing a stenotic tissue from a blood vessel, the method comprising:

• inserting a rotational atherectomy device into a blood vessel such that an abrasive element of the rotational atherectomy device is positioned proximate to a stenotic lesion, the rotational atherectomy device including:
• a rotatable, flexible, hollow drive shaft including a torque transmitting coil and a fluid delivery lumen for communicating fluid to the distal end portion of the drive shaft;
• the ail-abrasive element mounted to a distal end portion of the drive shaft and being fixedly positioned relative to the circumference of the drive shaft;
• and proximal and distal fluid inflatable counterweights fixedly positioned along the distal end portion of the drive shaft on opposite sides of the abrasive element and being in fluid communication with the fluid delivery lumen of the drive shaft;
• rotating the drive shaft of the rotational atherectomy device so that the abrasive element, the distal fluid inflatable counterweight, and the proximal fluid inflatable counterweight rotate together with the distal end portion of the drive, wherein a center of mass of each of the proximal and distal fluid inflatable counterweights is offset from the longitudinal axis of the drive shaft in a first direction while the center of mass of the abrasive element is offset from the longitudinal axis of the drive shaft in a second opposite direction;
• and
• delivering fluid through the fluid delivery lumen of the drive shaft toward the distal end portion of the drive shaft so as to cause a distal facing port at a distal-most end of the drive shaft is adjusted from an opened condition to a closed condition.