| 摘要 |
<p>A stent delivery apparatus (10) is disclosed, having an inner balloon (16) and an outer balloon (14) mounted near the distal end of a catheter (12). The outer balloon is a durable material such as polyethylene having a relatively thick wall to resist punctures by the stent (A) when the stent is crimped over the balloon. The outer balloon is expanded to a nominal diameter to expand the stent in place at the selected location in the lesion. The inner balloon is a high pressure material such as polyethylene terephthalate having a relatively thin wall to allow the balloon to be wrapped to a very low profile. The inner balloon is expanded to a nominal diameter to anchor the stent in place in the lesion, but will not stretch beyond its nominal diameter if further pressurized. The nominal expanded diameter of the inner ballon is greater than that of the outer balloon.</p> |
