| 摘要 |
The present invention provides, in one embodiment, a rotational atherectomy device which includes an exchangeable drive shaft cartridge (80) having a rotatable drive shaft socket (180) carried by a drive shaft carriage (150) and attached to a proximal portion of a drive shaft (60). A rotatable, radially expandable prime mover coupling (330) carried by a prime mover carriage (200) is also provided and is connected to a prime mover for rotation therewith. The drive shaft socket is sized to receive a length of the prime mover coupling therein such that the prime mover coupling does not effectively engage an interior surface of the drive shaft socket when the coupling is not rotating, but the prime mover coupling radially expands to effectively engage the socket upon sufficiently rapid rotation of the prime mover, causing the socket and the drive shaft to rotate together with the prime mover coupling and the prime mover. As a result, when the prime mover is not rotating, the drive shaft is disconnected from the prime mover, thereby permitting the exchangeable drive shaft cartridge to be replaced by another exchangeable drive shaft cartridge.
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