| 摘要 |
[Object] To shorten the time required for excision of an atheroma generated in a blood vessel takes. [Solution] An atherectomy device has a drive circuit 90 which rotates a direct-current motor M. The drive circuit 90 has a three-terminal regulator 91 having an ADJ terminal. A partial pressure resistor R7 is connected between the ADJ terminal and an output terminal of the three-terminal regulator 91. Moreover, one end of six variable resistors VR2 to VR7 whose resistances are set to be different from each other is connected to the ADJ terminal. The other end of the six variable resistors VR2 to VR7 is selectively connected to the negative electrode of a battery E by a change-over switch SW2 which is a rotary switch having six contacts. When the variable resistors are switched by the change-over switch SW2, the output current of the three-terminal regulator 91 becomes large. Thus, the rotation speed of a cutter which is rotated by the direct-current motor M becomes high. |
