| 摘要 |
A mechanism stretches and slightly twists an intraaortic balloon to a stretched and wrapped state prior to insertion or removal. One embodiment includes a member which extends through a catheter from the handle to the balloon, and which advances to extend the balloon while slightly twisting it. A spiral drive screw assembly in the handle defines a precise ratio of balloon extension to twist, and also defines fixed total amounts of twist and extension delivered by the member. The mechanism permits the balloon to be fully untwisted once it is inserted and to be recompacted, following use, for removal from the patient. The device is of particular utility for a large diameter or non-cylindrical balloon, and for inserting a balloon along an arterial path having a narrow passage or sharp curve.
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