| 摘要 |
An apparatus for use with an expandable stent having oppositely disposed first and second terminal edges. The apparatus has a catheter shaft with a lumen, and an inflatable balloon with oppositely disposed first and second end portions and an internal chamber. The internal chamber is in fluid communication with the lumen of the catheter shaft, and receives inflation fluid to inflate the balloon. The balloon has cylindrical inner and outer surfaces that extend between the end portions. The cylindrical inner surface is secured to the catheter shaft at first and second attachment sites adjacent the first and second end portions, respectively. At least one of the first and second end portions of the balloon has a toroidal shape defined by an arcuate end surface that intersects the cylindrical inner and outer surfaces at a common radial plane. A respective one of the attachment sites is located adjacent the one end portion lying adjacent the common radial plane. The balloon is positionable within the stent so that one of the terminal edges of the stent lies in the common radial plane to ensure that, when the balloon is expanded, the one terminal edge receives full and uniform expansion pressure.
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