MEDICAL DEVICE AND TREATMENT METHOD

摘要

A treatment medical and medical device are disclosed for cutting a substance inside a body lumen. The medical device includes a drive shaft that is rotatable; a strut that is rotatably connected to a distal side of the drive shaft, that extends along a rotation axis, and whose central portion is expandable radially outward; and a support portion that is rotatably connected to the distal side of the drive shaft, that is formed in a mesh shape and a tubular shape while including multiple gaps, at least a portion of which is positioned on a radially inner side of the strut, and that is expandable radially outward by a central portion in a direction extending along the rotation axis being bent.

主权项

1. A treatment method for cutting substances inside a body lumen by using a medical device including a tubular drive shaft that is rotatable, a tubular outer sheath that can accommodate the drive shaft, at least one strut that is rotatably connected to a distal side of the drive shaft, that extends along a rotation axis, and whose central portion is bent so as to be expandable radially outward, a linear motion shaft that is arranged inside the drive shaft, and that expands the strut by moving relative to the drive shaft in an axial direction, and a liquid supply unit that supplies liquid to one of a portion between the outer sheath and the drive shaft and a portion between the drive shaft and the linear motion shaft, the treatment method comprising:
inserting the at least one strut in a contracted state into the body lumen; expanding the at least one strut by moving the linear motion shaft to the drive shaft; cutting the substances inside the body lumen by causing the drive shaft to rotate the at least one strut; supplying the liquid from the liquid supply unit to one of the portion between the outer sheath and the drive shaft and the portion between the drive shaft and the linear motion shaft so that the liquid flows in a distal direction, in a state where the medical device is inserted into the body lumen; and contracting the at least one strut and removing the at least one strut from the inside of the body lumen.