| 摘要 |
Disclosed is a catheter (10) for performing balloon angioplasty, characterized by an elongate, flexible catheter shaft (12) having a plurality of lumens therethrough, a plurality of imperforate angioplasty balloons (16, 20, 42) on the shaft (12), with the interior of each of the balloons (16, 20, 42) connected to a different one of the lumens for separate inflation and deflation, each of the balloons (16, 20, 42) having a predetermined maximum inflated diameter and being formed of non-elastomeric material, the balloons (16, 20, 42) being capable of substantially maintaining the predetermined maximum inflated diameter at inflation pressures of 100 psi, the balloons (16, 20, 42) comprising a first balloon (16) on the catheter shaft (12) near the distal end thereof, and a second balloon (20) on the catheter shaft (12) on top of the first balloon (16), so that the first balloon (16) is at least partially inside the second balloon (20), the second balloon (20) having an uninflated thickness, the maximum inflated diameter of the first balloon (16) is less than the maximum inflated diameter of the second balloon (20), so that the catheter (10) has two different fixed working diameters for dilating stenoses at a single point at the distal end thereof, one of the working diameters corresponding to the maximum inflated diameter of the first balloon (16) plus the uninflated thickness of the second balloon (20) over the first balloon (16), and the other of the working diameters corresponding to the maximum inflated diameter of the second balloon (20). Also disclosed are catheters further including a third balloon (42). |
