Medical fluid pumping system having backflow prevention
AssigneesBaxter International Inc., Baxter Healthcare S.A.
InventorTroy J. Orr
Life of this patent
Estimating the term…
Abstract
A medical fluid pumping system includes a medical fluid pump for pumping a process fluid and a medical fluid chassis operable with the medical fluid pump. The medical fluid pump includes a first pump chamber, a first inlet valve chamber including a first inlet valve diaphragm, a first outlet valve chamber, a second pump chamber, a second inlet valve chamber including a second inlet valve diaphragm, and a second outlet valve chamber. The medical fluid chassis includes a motive fluid source providing motive fluid at a motive fluid pressure. The first and second inlet valve diaphragms are configured to actuate from an open to a closed position at a pressure less than the motive fluid pressure to mitigate process fluid backflow through the first and second inlet valves.
Claims19
A medical fluid pumping system comprising:
- a medical fluid pump for pumping a process fluid, the medical fluid pump including
- a first pump chamber,
- a first inlet valve chamber in fluid communication with the first pump chamber, the first inlet valve chamber including a first inlet valve diaphragm,
- a first outlet valve chamber in fluid communication with the first pump chamber,
- a second pump chamber,
- a second inlet valve chamber in fluid communication with the second pump chamber, the second inlet valve chamber including a second inlet valve diaphragm,
- a second outlet valve chamber in fluid communication with the second pump chamber,
- a first valve seal separate from the first inlet valve diaphragm and configured to compress the first inlet valve diaphragm around the first inlet valve chamber, wherein the first valve seal comprises an o-ring configured to fit into a groove surrounding the first inlet valve chamber, and
- a second valve seal separate from the second inlet valve diaphragm and configured to compress the second inlet valve diaphragm around the second inlet valve chamber, wherein the second valve seal comprises an o-ring configured to fit into a groove surrounding the second inlet valve chamber;
- and
- a medical fluid chassis operable with the medical fluid pump, the medical fluid chassis including a motive fluid source providing a motive fluid at a motive fluid pressure, wherein the first and second inlet valve diaphragms are configured to actuate from an open position to a closed position at a differential pressure less than the motive fluid pressure to mitigate a process fluid backflow through the first and second inlet valve chambers.
A medical fluid pump for pumping a process fluid, the medical fluid pump comprising:
- a first pump chamber;
- a first inlet valve chamber in fluid communication with the first pump chamber, the first inlet valve chamber including a first inlet valve diaphragm;
- a first outlet valve chamber in fluid communication with the first pump chamber;
- a second pump chamber;
- a second inlet valve chamber in fluid communication with the second pump chamber, the second inlet valve chamber including a second inlet valve diaphragm;
- a second outlet valve chamber in fluid communication with the second pump chamber;
- a first valve seal separate from the first inlet valve diaphragm and configured to compress the first inlet valve diaphragm around the first inlet valve chamber, wherein the first valve seal comprises an o-ring configured to fit into a groove surrounding the first inlet valve chamber;
- and
- a second valve seal separate from the second inlet valve diaphragm and configured to compress the second inlet valve diaphragm around the second inlet valve chamber, wherein the second valve seal comprises an o-ring configured to fit into a groove surrounding the second inlet valve chamber,
- wherein the first and second inlet valve diaphragms are configured to actuate from an open position to a closed position at a differential pressure less than a supplied motive fluid pressure to mitigate a process fluid backflow through the first and second inlet valve chambers.
Dependencies are inferred from the claim text.