| 摘要 |
An atherectomy device for removing stenotic tissue from a vessel of a patient comprises a rotatable, flexible, hollow drive shaft 2 having a distal end insertable into the vessel and an abrasive element 101 mounted to the drive shaft proximal to and spaced away from a solid support element 10 mounted at the distal end of the drive shaft. The support element having a rounded outer surface and comprising an outflow channel 20 extending through the support element and opening in the rounded outer surface. The drive shaft comprises a torque transmitting coil 4 and at least one fluid impermeable membrane 3 forming a lumen for the flow of fluid through the drive shaft into the outflow channel of the support element such that, during rotation of the drive shaft, the opening of the outflow channel is facing an inner surface of the vessel so that the flow of fluid from the opening forms a fluid layer which acts as a fluid bearing between the support element and the wall of the treated vessel. They may be another support element positioned on the opposite side of the abrasive element. The centre of mass of the support elements may be placed coaxially along the shaft or be offset. |
