| 摘要 |
A stent is made generally tubular and is initially formed in a collapsed configuration. A fabric cover is provided for the inner stent and is attached outside the stent at one or more desired locations. The fabric cover is larger in diameter than the diameter of the collapsed stent, however, when the stent is expanded through activation of the balloon catheter therewithin, the stent expands to closely conform to the interior walls of the fabric cover. The securement of the fabric cover or intermediate stent layer about the inner stent is accomplished through the use of a wire spiraling externally about the outer surface of the fabric cover to secure the fabric cover or intermediate stent layer about the inner stent. When the stent sandwich is expanded, the configuration of this spiraling wire permits it to expand as well and lie against the inner walls of the blood vessel at the desired location. The stent has spaced ends, each of which may be coated or otherwise provided with a radio-opaque material. |
