초록 ▼

A device for selectively controlling the direction of blood flow to and from the patient during hemodialysis comprises two interlocking disks that rotate in relation to each other without separating. The two disks have fluid fittings that allow the blood lines attached to the patient to connect to o

A device for selectively controlling the direction of blood flow to and from the patient during hemodialysis comprises two interlocking disks that rotate in relation to each other without separating. The two disks have fluid fittings that allow the blood lines attached to the patient to connect to one of the disks and the blood inlet and outlet for the hemodialysis machine to connect to the other. The center of each fluid fitting is a channel that aligns to a corresponding channel in the other disk. The disks rotate between two fixed relative positions, referred to herein as preferred alignments. The preferred alignments are such that the line drawing blood from the patient in the first preferred alignment becomes the line returning blood to the patient in the second preferred alignment, and the line returning blood to the patient in the first preferred alignment becomes the line drawing blood from the patient in the second preferred alignment. A bypass channel allows blood to flow from the outlet to the inlet of the hemodialysis machine when the device is in neither of its two preferred alignments.

대표청구항 ▼

[ We claim:] [1.] In a system for administering extra-corporeal therapy to blood comprising a blood circuit connecting a blood treatment apparatus such as a hemodialysis machine to a patient's vascular system, a device for reversing the direction of flow to and from the patient without interrupting

[ We claim:] [1.] In a system for administering extra-corporeal therapy to blood comprising a blood circuit connecting a blood treatment apparatus such as a hemodialysis machine to a patient's vascular system, a device for reversing the direction of flow to and from the patient without interrupting or changing the direction of flow through the portion of the blood circuit which passes through the blood treatment apparatus, said device comprising:a. a first patient fluid fitting and a second patient fluid fitting each of which is able to provide flow in either direction with respect to the patient;b. a first blood treatment apparatus fluid fitting which establishes fluid flow to the blood treatment apparatus and a second blood treatment apparatus fluid fitting which establishes fluid flow from the blood treatment apparatus;c. a mechanism having a plurality of positions, said plurality comprising at least a first position that simultaneously aligns the first patient fluid fitting with the first blood treatment apparatus fluid fitting and the second patient fluid fitting with the second blood treatment apparatus fluid fitting, and a second position that simultaneously aligns the first patient fluid fitting with the second blood treatment apparatus fluid fitting and the second patient fluid fitting with the first blood treatment apparatus fluid fitting and, while in said first position and said second position, said mechanism maintaining substantially unobstructed fluid connections between aligned fluid fittings; andd. a fluid conduit which maintains substantially unobstructed fluid connection between the first blood treatment apparatus fluid fitting and the second blood treatment apparatus fluid fitting in all of the plurality of positions other than the first position and the second position and which in all of the plurality of positions simultaneously prevents flow to or from the first patient fluid fitting and the second patient fluid fitting.