| 摘要 |
<p>Material transport catheters and method for their use rely on rotation of an impeller within a catheter body (12). The impeller (60) preferably comprises an inner tube (62) or shaft having a helical rotor (64) formed over an outer surface thereof. Optionally, in the case of a tubular shaft (62), a second helical rotor (66) may be provided within the shaft lumen (68) in order to induce flow in opposite or in the same direction as induced by the outer helical rotor. Catheters (112) may further comprise structures (126) near their distal ends for disrupting clot, and are preferably introduceable over guidewires (120) where the helical rotors (142) are rotated directly over the guidewire (120). The catheters (112) may include two or more impellers (140) or impellers having two or more rotors in order to provide for circulation of materials at a target site within a patient body lumen.</p> |
