A rotational device for removing an occlusion from inside a tubular structure, the device comprising a drive shaft for insertion over a guidewire into a tubular structure and an abrasive element on the drive shaft having its centre of mass offset from a longitudinal axis of the drive shaft. A solid counterweight is disposed on the drive shaft spaced from the abrasive element and having its centre of mass offset from the longitudinal axis of the drive shaft so that the abrasive element moves in an orbital path around said axis to abrade an occlusion from inside the tubular structure when the drive shaft rotates around the guidewire.
