Patent ID: 6589234
Filing Date: 2003-07-08
Classification: A61B

Abstract:
A medical device comprising:a first member defining an injection lumen, a second member circumferentially disposed around the first member, to define a return lumen therebetween, the return lumen having proximal and distal ends and at least one cross-sectional area therebetween, the proximal end of the return lumen being in fluid communication with a source of vacuum, and a third member disposed around a distal end portion of the return lumen between the second member and the first member to define a restriction lumen between the third member and the first member, the restriction lumen having at least one cross-sectional area smaller than the at least one cross-sectional area of the return lumen, the third member further defining a vacuum buffer lumen between the second member and the third member, the vacuum buffer lumen being in fluid communication with the return lumen.