Patent ID: 6398714
Filing Date: 2002-06-04
Classification: A61M

Abstract:
A cardiac assist catheter pump comprising:a catheter having a distal end portion, at least one inlet passage in said distal end portion and at least one outlet passage spaced from said distal end portion; and a displacement structure; said displacement structure communicating with said catheter for alternatingly applying suction for displacing fluid from said catheter to said displacement structure and applying pressure for displacing fluid from said displacement structure to said catheter; said catheter comprising a valve arrangement for obstructing outward blood flow via said inlet passage and inward blood flow via said outlet passage; and said valve arrangement including a valve body movable between an inlet position obstructing flow through said outlet passage and allowing flow through said inlet passage and an outlet position obstructing flow through said inlet passage and allowing flow through said outlet passage, wherein interspaces between said valve body and a wall of the catheter are each at least open on at least two axially opposite sides when the valve body-is in its inlet or outlet position for allowing blood to flow through said interspaces.