provided with side holes 26 as seen in fig2 to increase outlet capacity typically the tip of the catheter 10 will be tapered as indicated at 23 so that it may fit closely about a guidewire extending through the lumen 22 for smooth percutaneous entry as will be appreciated by those familiar with the art the system of the present invention also includes an outer sheath indicated generally by the reference character 28 through which the catheter 10 extends the sheath is circular in cross section as is the catheter 10 and may be formed from an appropriate extruded tube such as fep or ptfe fluorinated polymer the sheath 28 is several centimeters shorter than the catheter 10 by an amount at least equal to the length of the curved distal portion 14 of the catheter 10 in the illustrative embodiment the sheath is between 5 and 30 centimeters preferably approximately 10 centimeters shorter than the catheter typically the sheath length will be between 30 to 150 cm depending on the length of the catheter the proximal end of the sheath may be provided with a hemostasis fitting 30 that receives the catheter 10 and includes an internal proximal gasket 32 fig2 that engages the.