| 摘要 |
Apparatus includes an elongated flexible catheter having proximal and distal end portions, with fluidly connected coaxial lumens extending therebetween, and a diameter sufficiently small for insertion into a patient's intraluminal passageways. One or more treating elements are positionable within one of the lumens and movable between the proximal and distal portions by fluid flowing through the lumens. The distal portion includes a distal guide wire lumen having a proximal exit port distally located relative to the treatment elements positioned at the distal portion. To simultaneously achieve stiffness along the proximal portion and flexibility along the distal portion, the inner and/or outer coaxial members may be of more than one-piece construction. The inner and/or outer members may also be stepped or bumped in diameter to decrease the pressure and fluid transit times within the catheter. A balloon may be added to the distal portion for positioning the catheter or performing angioplasty.
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