Abstract: An atherectomy system includes an atherectomy burr having one or more blood flow enhancement features that permit an increased level of blood flow past the burr relative to a blood flow that would result absent the one or more flow enhancement features. A drive mechanism is adapted to rotatably actuate the atherectomy burr.

Abstract: Medical device systems as well as methods for making and using medical device systems are disclosed. An example medical device system may include an advancer including a drive mechanism. A sleeve may be secured to the drive mechanism. A drive shaft may extend through the sleeve. The drive shaft may have a proximal end region secured to the drive mechanism and a distal end region. A rotational device may be coupled to the distal end region of the drive shaft.

Abstract: An atherectomy system includes a drive mechanism adapted to rotatably actuate an atherectomy burr and a controller that is adapted to regulate operation of the drive mechanism. The controller is adapted to calculate an estimated load torque at the atherectomy burr based upon at least one of an angular velocity of the atherectomy system and an angular acceleration of the atherectomy system. The controller is further adapted to stop or reverse the drive mechanism when the estimated load torque at the atherectomy burr exceeds a torque threshold.