Abstract: A medical device for cutting substances inside a body lumen, includes a flexible and elongated drive shaft including a distal portion and a proximal portion, an outer shaft that surrounds the drive shaft, a cutting member connected to the distal portion to be rotatable with the drive shaft, and a hub by which the proximal portion is supported. The hub includes a plurality of bearings on the drive shaft, and a knob connected to the outer shaft and independently rotatable with respect to the drive shaft. The drive shaft includes a lumen through which the substances cut by the cutting member are transported from the distal portion side thereof to the proximal portion side thereof and discharged at a location of the drive shaft that is between the bearings.

Abstract: A medical device for cutting substances inside a body lumen includes a flexible and elongated drive shaft including a distal portion and a proximal portion, a cutting member connected to the distal portion of the drive shaft to be rotatable with the drive shaft, and a hub located at the proximal portion and supporting the drive shaft, the hub including a first bearing mounted on the drive shaft and an elastic ring that is made of an elastic material on an outer periphery of the first bearing.

Abstract: A medical device for cutting substances inside a body lumen includes a flexible and elongated drive shaft including a distal portion and a proximal portion, a cutting member connected to the distal portion of the drive shaft to be rotatable with the drive shaft, and a hub located at the proximal portion and supporting the drive shaft, the hub including a first bearing mounted on the drive shaft and an elastic ring that is made of an elastic material on an outer periphery of the first bearing.