| 摘要 |
An intravascular device, such as a sheath, and methods for use thereof for selective alternate positioning of other intravascular devices having predetermined sizes in a distal vascular region of the body of a patient. The intravascular selection sheath comprises a tubular body having proximal, intermediate and distal sections and a lumen extending therethrough. The portion of the lumen in the distal section can be occupied by only one of the other intravascular devices of the predetermined sizes at a given time. The portion of the selection sheath lumen in the intermediate section can be occupied by at least two intravascular devices of the predetermined sizes in a side by side relationship. In operation, the two other intravascular devices occupy positions in the lumen in the intermediate section of the selection sheath. First, one of the intravascular devices can be advanced into the lumen in the distal section of the selection sheath and then withdrawn back into the intermediate section. Next, the other of the intravascular devices can be advanced from the intermediate section into the distal section of the selection sheath, thereby allowing for multiple diagnostics, therapies, or other procedures to be performed alternatively. The other intravascular devices that occupy positions in the sheath lumen can be exchanged for yet further intravascular devices. This selection sheath geometry can also be incorporated in intravascular devices that provide therapeutic and/or diagnostic functions.
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