Medical devices and methods for using medical devices are disclosed. A rotational atherectomy device may include an elongate drive coil having a proximal end region and a distal end region, the elongate drive coil having a coil winding extending in a first helical direction, the elongate drive coil having a coil pitch. A tubular member is welded to the distal end region of the elongate drive coil via one or more helical welds that extend helically at least part way around the tubular member and a cutting member welded to the tubular member.