Rotary valves for dialysis systems

Patent metadata

Field	Value
Publication number	US-12013050-B2
Application number	US-202117376845-A
Country	US
Kind code	B2
Filing date	Jul 15, 2021
Priority date	Jul 31, 2018
Publication date	Jun 18, 2024
Grant date	Jun 18, 2024

Abstract

In one aspect, a dialysis fluid cassette includes an inlet fluid line, multiple outlet fluid lines, and a valve including an actuation feature by which the valve can be rotated to fluidly communicate the inlet fluid line with a selected fluid line of the multiple outlet fluid lines.

First claim

What is claimed is:

1. A dialysis fluid cassette, comprising:
a plurality of inlet fluid lines;
a plurality of outlet fluid lines;
a valve comprising:
an actuation feature by which the valve can be rotated to fluidly communicate a selected inlet fluid line of the plurality of inlet fluid lines with a selected outlet fluid line of the plurality of outlet fluid lines, and
a valve body comprising:
a first portion defining a first internal fluid conduit that can fluidly communicate the selected inlet fluid line with the selected outlet fluid line to define a fluid pathway of a plurality of fluid pathways within the dialysis fluid cassette, and
a second portion defining a second internal fluid conduit that is axially offset from the first internal fluid conduit, wherein first and second portions are positioned along a central axis of the valve, and wherein the first and second portions of the valve body are rotatable with respect to each other; and

a fluid loop that fluidly communicates the first internal fluid conduit with the second internal fluid conduit.

2. The dialysis fluid cassette of claim 1 , wherein the actuation feature comprises a protrusion that extends from a main body of the valve.

3. The dialysis fluid cassette of claim 1 , wherein the valve further comprises an indicator having an orientation that corresponds to the selected fluid line.

4. The dialysis fluid cassette of claim 1 , wherein the valve further comprises a seal disposed along a sidewall of the valve.

5. The dialysis fluid cassette of claim 4 , wherein the seal is configured to form a hermetic seal between the valve and the selected fluid line.

6. The dialysis fluid cassette of claim 5 , wherein the seal comprises a compound curvature.

7. The dialysis fluid cassette of claim 4 , wherein the seal is configured to form a hermetic seal between the valve and a housing of the dialysis fluid cassette.

8. The dialysis fluid cassette of claim 1 , wherein the selected inlet fluid line is a first selected inlet fluid line, the selected outlet fluid line is a first selected outlet fluid line, and the fluid pathway is a first fluid pathway, and wherein the second internal fluid conduit can fluidly communicate a second selected inlet fluid line of the plurality of inlet fluid lines with a second selected outlet fluid line of the plurality of outlet fluid lines to define a second fluid pathway of the plurality of fluid pathways within the dialysis fluid cassette.

9. The dialysis fluid cassette of claim 1 , wherein the actuation feature comprises a surface profile that is formed to be engaged by an actuator for rotating the valve.

10. The dialysis fluid cassette of claim 1 , wherein the actuation feature has a symmetric shape.

11. The dialysis fluid cassette of claim 1 , wherein the actuation feature has an asymmetric shape.

12. The dialysis fluid cassette of claim 1 , wherein the actuation feature comprises a recessed profile.

13. A dialysis fluid system, comprising:
a dialysis fluid cassette, comprising:
a plurality of inlet fluid lines;
a plurality of outlet fluid lines;
a valve comprising:
an actuation feature by which the valve can be rotated to fluidly communicate a selected inlet fluid line of the plurality of inlet fluid lines with a selected outlet fluid line of the plurality of outlet fluid lines, and
a valve body comprising:
a first portion defining a first internal fluid conduit that can fluidly communicate the selected inlet fluid line with the selected outlet fluid line to define a fluid pathway of a plurality of fluid pathways within the dialysis fluid cassette, and
a second portion defining a second internal fluid conduit that is axially offset from the first internal fluid conduit, wherein first and second portions are positioned along a central axis of the valve, and wherein the first and second portions of the valve body are rotatable with respect to each other; and

a fluid loop that fluidly communicates the first internal fluid conduit with the second internal fluid conduit.

Assignees

• Fresenius Medical Care Holdings Inc

Inventors

• Moss Jon F
• Egley Bert D
• James Philip Scott
• Peterson James

Classifications

• A61M1/155

  with treatment-fluid pumping means or components thereof · CPC title

• A61M1/1561

  at least one cassette surface or portion thereof being flexible, e.g. the cassette having a rigid base portion with preformed channels and being covered with a foil · CPC title

• A61M1/1565

  Details of valves · CPC title

• A61M1/154

  with sensing means or components thereof · CPC title

• A61M1/1524

  the interface providing means for actuating on functional elements of the cassette, e.g. plungers · CPC title