Catheter with uniform spray pattern along infusion length

摘要

An improved catheter includes a double spiral configuration of infusion holes around the circumference and along the length of the catheter which provides an improved lateral dispersion of a thrombolytic fluid to more completely and quickly lyse a clot through which the catheter is passing. The double spiral configuration consists of groups or sets of infusion holes, typically groups of four. The holes in each set are longitudinally spaced from each other at substantially regular intervals along the length of the catheter. Each successive hole in a given group is circumferentially spaced by an angular distance of about 90° around the circumference of the catheter relative to the immediately preceding hole. Each group of holes is circumferentially spaced or offset by an angular distance of between 1° and 89° relative to the immediately preceding group of holes. Typically, the angular spacing between successive groups of holes is 18°. Varying are employed to ensure a more uniform distribution of fluid. Smaller holes are employed on an upstream portion of the catheter while larger holes are employed on a downstream portion of the catheter.