A catheter system including an infusion catheter interacting with an occluding wire. The infusion catheter has an interior surface defining a lumen longitudinally extending between a proximal end and a distal end. The interior surface of the catheter includes a cylindrical first portion positioned at the proximal end, a cylindrical second portion positioned at the distal end, and an annular, sloped, tapered portion extending therebetween. The second portion terminates at a tip opening. An annular sensing ridge radially inwardly projecting around the tip opening. A plurality of small infusion holes extend through the side of the infusion catheter proximal of the tapered portion. The occluding wire includes a thin placement wire having an enlarged occluding ball placed at the distal end thereof. Projecting from the occluding ball on the side opposite the positioning wire is a coiled spring wire. The spring wire has ridges formed by the top of the wire and grooves formed between each coil. The maximum outer diameter of the spring wire is larger than the inner diameter of the annular sensing ridge. Accordingly, as the coiled spring wire passes through the sensing ridge, the sensing ridge tactually engages the coiled wire to causes vibrations felt by the user.