Blood treatment catheter and method
View Patent ↗Disclosed are various embodiments of a hemo-dialysis catheter in which the aspirating port at the end of the aspirating tube is distal of the infusion port or ports at the end of the infusion lumen. The infusion port or ports are arranged circumferentially so that the infused filtered blood is a substantially 360° jet of fluid with a substantial radial component. This jet of fluid serves to abrade the occlusive material that is composed of fibrin and other components that grows down along the outer wall of the catheter that would otherwise tend to block off the ports. Stopping occlusion growth at the zone of the infusion ports prevents further growth distally to the aspirating port and protects the aspirating port from being blocked by the growth of occlusion.
1. A hemodialysis catheter comprising:
an aspiration lumen and an infusion lumen,
said infusion lumen having an exit port arrangement, said infusion lumen being circumferentially deployed around said aspirating lumen in a zone adjacent to said infusion exit port arrangement,
said aspiration lumen terminating distally from the distal end of said infusion lumen,
said exit port arrangement providing an emission of fluid from said infusion lumen over substantially a 360 degrees zone to provide a circumferential planar jet of fluid with a substantial radial component,
said exit port arrangement providing said planar jet constituting the sole exit ports in said infusion lumen.
2. The catheter of claim 1 wherein: said infusion lumen has an axis and the plane of said zone is substantially perpendicular to said axis of said infusion lumen.
3. The catheter of claim 2 further comprising:
a wall on the catheter at a position adjacent to and distal of said infusion exit port arrangement to assure a substantial radial component for fluid flow from said infusion exit port arrangement.
4. The catheter of claim 2 wherein:
said exit port arrangement in said zone are first and second sets of arcuate ports along first and second adjacent and parallel planes respectively, each port in one of said planes partially circumferentially overlapping adjacent ports in the other one of said planes.
5. The catheter of claim 2 wherein: said exit port arrangement in said zone is a set of elongate ports at an angle to said plane, each of said ports partially circumferentially overlapping adjacent ones of said ports.
6. The catheter of claim 1 further comprising:
a wall on the catheter at a position adjacent to and distal of said infusion exit port arrangement to assure a substantial radial component for fluid flow from said infusion exit port arrangement.
7. The catheter of claim 6 wherein:
said exit port arrangement in said zone comprises: a set of openings at the distal end of said infusion lumen, said openings extending to said circumferential wall, and a set of separator webs between said openings.
8. The method of blood treatment employing a hemodialysis catheter having an aspiration lumen with an aspiration port and an infusion lumen having an infusion port arrangement to provide filtered blood comprising the steps of:
positioning the infusion port proximally of the aspiration port, and
infusing treated blood into the patient as a planar jet having a substantial radial component extending substantially 360 degrees in a zone around the periphery of the catheter, and
providing infusion ports solely in said zone.
9. The method of claim 8 further comprising the step of: eroding occlusion buildup at the site of said infusing.
10. In the method of aspirating blood through an aspirating port of a hemodialysis catheter, filtering the blood and infusing the filtered blood back into a patient through an infusion port arrangement of the catheter, the improvement comprising the steps of:
infusing the filtered blood in a planar jet along a zone substantially 360 degrees around the periphery of the catheter,
providing infusion ports solely in said zone,
providing the aspiration port at a position distal of said infusion port arrangement, and
at the infusion port arrangement, eroding occlusive material that grows along the outer surface of the catheter.