| 摘要 |
<p>Medical vascular catheters adapted to be inserted into a blood vessel from an incision through the skin of a patient for introducing other devices or fluids for diagnostic or therapeutic purposes into the patient's vasculature and manufacturing methods are disclosed. The catheters have an extruded soft tip attached to the distal end of the catheter body that has one or more longitudinally extending radiopaque stripe formed therein by co-extrusion with the non-radiopaque portion of the soft tip. Preferably, each such radiopaque stripe is embedded within the polymer that merges to form the inner lumen surface and the outer tube surface, so that the particles of radiopaque powder material are substantially encased in the polymer material to provide smooth lumen and outer tube surfaces. The embedded strip cross section can be circular or arcuate, depending on the shape of the extrusion jet bore used to inject the blend of radiopaque material and polymer. Alternatively, the radiopaque stripes of any shape can extend to either one or both of the outer tube surface and the inner lumen surface. A low concentration of the radiopaque material can be included in the polymer forming the entire side wall of the extruded tube so that the entire distal soft tip exhibits faint radiopacity when viewed under fluoroscopy, but the radiopaque stripes exhibit are stronger radiopacity.</p> |
