Blood treatment 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, the medical fluid pump including 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; and a medical fluid chassis operable with the medical fluid pump, the medical fluid chassis including a motive fluid source providing motive fluid at a motive fluid pressure, and wherein 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.
Claims22
A medical fluid pumping system comprising:
- a medical fluid pump for pumping a process fluid, 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, and
- a second outlet valve chamber in fluid communication with the second pump chamber;
- and
- a medical fluid chassis operable with the medical fluid pump, the medical fluid chassis including a motive fluid source providing motive fluid at a motive fluid pressure, and wherein the first and second inlet valve diaphragms are configured to actuate from an open position 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.
A medical fluid pump for pumping a process fluid, 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;
- and
- a second outlet valve chamber in fluid communication with the second pump chamber, wherein the first and second inlet valve diaphragms are configured to actuate from an open position to a closed position at a pressure less than a supplied motive fluid pressure to mitigate process fluid backflow through the first and second inlet valves.
A method for mitigating process fluid backflow through an inlet valve chamber of a medical fluid pump including the inlet valve chamber, a pump chamber and an outlet valve chamber, the method comprising:
- providing an inlet valve diaphragm operable with the inlet valve chamber;
- providing a pump diaphragm operable with the pump chamber;
- and
- forming the inlet valve diaphragm so as to actuate from an open position to a closed position more quickly than the pump diaphragm.
Dependencies are inferred from the claim text.