Patent ID: 8007488

Claim:
A catheter, comprising: an elongate body with a distal end, a proximal end, and an intermediate section disposed between the distal end and the proximal end, the elongate body having a central longitudinal axis and including: a first chamber extending within the elongate body from the proximal end to the intermediate section and a second chamber extending within the elongate body from the proximal end to the intermediate section, the first chamber having a first chamber opening at the intermediate section, and the second chamber having a second chamber opening at the intermediate section; and a wall extending from the proximal end to the intermediate section to separate the first chamber from the second chamber, the wall further extending distally past the first chamber opening and the second chamber opening to provide a guide structure extending from the intermediate section toward the distal end; and a valve structure extending coaxially with the elongate body, the valve structure having first and second tapered portions and configured to be axially displaced along the guide structure between a covered position where the valve structure is positioned to inhibit flow through the first and second chamber openings and an uncovered position where the valve structure is positioned to permit flow through the first and second chamber openings, and wherein the shape of the first and second tapered portions remains constant during axial displacement.