US 4,069,155 AGranted

Hemodialysis system

AssigneeTakeda Chemical Industries, Ltd.

InventorsYasuhiro Tsujimoto, Junichi Azuma, Yoshihiko Matsumura, Katsumi Noda

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Abstract

A hemodialysis system for use with any type of dialyzer, such as coil-type, Kiil-type and capillary-type or hollow fiber-type dialyzers, which has a fluid circulation circuit and a bypass circuit short-circuiting the fluid circulation circuit. At one junction between the fluid circulation circuit and the bypass circuit, an ejector is employed. The ejector has a nozzle, a diffuser axially aligned with the nozzle and defining an orifice and a suction chamber communicated with the orifice. During circulation of the dialysate in the circulation circuit and from the nozzle onto the diffuser of the ejector, a negative gauge pressure is developed in the suction chamber so that the dialysate can be drawn through the bypass circuit. The circulation circuit and the bypass circuit have respective coupling assemblies for removable connection with the coil-type dialyzer and with the Kiil-type or capillary-type, or hollow fiber-type, dialyzer.

Claims13

Dependent claims

A dialysate circulating system which can be made into a hemodialysis system by the addition of a dialyzer, said circulating system comprising, in combination:

a source of dialysate;
a fluid circulating circuit having one end connected to said source of dialysate for circulating the dialysate supplied from the source of dialysate along said fluid circulating circuit;
an ejector in said fluid circulating circuit and having an inlet nozzle, a diffuser axially aligned with said inlet nozzle and defining an orifice in cooperation with said nozzle and a suction chamber in communication with said orifice, said ejector being positioned in said circulating circuit for directing the dialysate being circulated from the nozzle into the diffuser for developing a negative gauge pressure in said suction chamber;
first and second mating coupling members in said fluid circulating circuit connectable to each other and being disposed in said circulating circuit downstream of said ejector in terms of the direction of flow of the dialysate;
a fluid circuit means connected between said source of dialysate and said suction chamber of said ejector;
and
third and fourth mating coupling members in said fluid circuit means connectable to each other,
said circulating system, when said third and fourth mating coupling members in said fluid circuit means are directly connected to each other, having therein a dialyzer of the type in which blood to be dialyzed is pumped through a blood chamber on one side of a semi-permeable membrane under a positive gauge pressure and dialysate is pumped through a dialysate chamber on the other side of the membrane under a pressure approximating or equal to atmospheric pressure with the opposite ends of the dialysate chamber connected between the first and second mating coupling members in said fluid circulating circuit and when the first and second mating coupling members are directly connected to each other, having therein a dialyzer of the type in which blood to be dialyzed is allowed to flow under the natural pressure thereof through a blood chamber on one side of a semi-permeable membrane and dialysate is caused to flow through dialysate chamber on the other side of the membrane under negative gauge pressure with the opposite ends of the dialysate chamber connected between the third and fourth coupling members in said fluid circuit means.

5 more elements

A dialysate circulating system which can be made into a hemodialysis system by the addition of a dialyzer, said circulating system comprising, in combination:

a source of dialysate;
a fluid circulating circuit having one end connected to said source of dialysate for circulating the dialysate supplied from the source of dialysate along said fluid circulating circuit;
an ejector in said fluid circulating circuit and having an inlet nozzle, a diffuser axially aligned with said inlet nozzle and defining an orifice in cooperation with said nozzle and a suction chamber in communication with said orifice, said ejector being postioned in said circulating circuit for directing the dialysate being circulated from the nozzle into the diffuser for developing a negative gauge pressure in said suction chamber;
first and second mating coupling members in said fluid circulating circuit connectable to each other and being disposed in said circulating ciruit downstream of said ejector in terms of the direction of flow of the dialysate;
a fluid circuit means connected between said fluid circulating circuit downsteam of said ejector and said suction chamber of said ejector;
and
third and fourth mating coupling members in said fluid circuit means connectable to each other,
said circulating system, when said third and fourth mating coupling members in said fluid circuit means are directly connected to each other, having therein a dialyzer of the type in which blood to be dialyzed is pumped through a blood chamber on one side of a semi-permeable membrane under a positive gauge pressure and dialysate is pumped through a dialysate chamber on the other side of the membrane under a pressure approximating or equal to atmospheric pressure with the opposite ends of the dialysate chamber connected between the first and second mating coupling members in said fluid circulating circuit and when the first and second mating coupling members are directly connected to each other, having therein a dialyzer of the type in which blood to be dialyzed is allowed to flow under the natural pressure thereof through a blood chamber on one side of a semi-permeable membrane and dialysate is caused to flow through a dialysate chamber on the other side of the membrane under a negative gauge pressure with the opposite ends of the dialysate chamber connected between the third and fourth coupling members in said fluid circuit means.

5 more elements

Dependencies are inferred from the claim text.