Rotary valves for dialysis systems
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.
1. A dialysis fluid cassette, comprising:
an inlet fluid line;
a plurality of outlet fluid lines; and
a valve comprising:
an actuation feature by which the valve can be rotated to fluidly communicate the inlet fluid line with a selected fluid line of the plurality of outlet fluid lines,
a valve body defining an internal fluid pathway that can fluidly communicate the inlet fluid line with the selected fluid line, and
a spring that is configured to move the valve body to enable or disable an operation of the valve.
2. 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.
3. The dialysis fluid cassette of claim 1 , wherein the actuation feature has a polygonal shape.
4. The dialysis fluid cassette of claim 1 , wherein the actuation feature has a symmetric shape.
5. The dialysis fluid cassette of claim 1 , wherein the actuation feature has an asymmetric shape.
6. The dialysis fluid cassette of claim 1 , wherein the actuation feature comprises a recessed profile.
7. The dialysis fluid cassette of claim 1 , wherein the valve body is movable to:
a first position at which the internal fluid pathway is aligned with the inlet fluid line and the plurality of outlet fluid lines to enable the operation of the valve, and
a second position at which the internal fluid pathway is offset from the inlet fluid line and the plurality of outlet fluid lines to disable the operation of the valve.
8. A dialysis system, comprising:
a dialysis fluid cassette, comprising:
an inlet fluid line;
a plurality of outlet fluid lines; and
a valve comprising:
an actuation feature by which the valve can be rotated to fluidly communicate the inlet fluid line with a selected fluid line of the plurality of outlet fluid lines,
a valve body defining an internal fluid pathway that can fluidly communicate the inlet fluid line with the selected fluid line, and
a spring that is configured to move the valve body to enable or disable an operation of the valve.