Pneumatic system having noise reduction features for a medical fluid machine
AssigneesBaxter International Inc., Baxter Healthcare S.A.
InventorsPaul R. Chapman, Robert W. Childers, Gideon Hecht, Anders Wellings
Life of this patent
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Abstract
A pneumatic system for a medical fluid machine operating a medical fluid cassette, the pneumatic system including an interface for supplying positive pneumatic pressure and negative pneumatic pressure to the medical fluid cassette; a source of positive pneumatic pressure; a source of negative pneumatic pressure; and a pneumatic pump including a first head and a second head, wherein the first head is dedicated to supplying positive pneumatic pressure to the positive pneumatic pressure source and the second head is dedicated to supplying negative pneumatic pressure to the negative pneumatic pressure source.
Claims20
A pneumatic system for a medical fluid machine operating a medical fluid cassette, the pneumatic system comprising:
- an interface configured to supply positive pneumatic pressure and negative pneumatic pressure to the medical fluid cassette;
- a source of positive pneumatic pressure;
- a source of negative pneumatic pressure;
- a pneumatic pump including a first head and a second head, wherein the first head is dedicated to supplying positive pneumatic pressure to the positive pneumatic pressure source and the second head is dedicated to supplying negative pneumatic pressure to the negative pneumatic pressure source;
- and a pneumatic line extending outside the pneumatic pump so as to allow direct pneumatic communication between the second head and the first head.
A pneumatic system for a medical fluid machine operating a medical fluid cassette, the pneumatic system comprising:
- an interface configured to supply positive pneumatic pressure and negative pneumatic pressure to the medical fluid cassette;
- a source of positive pneumatic pressure;
- a source of negative pneumatic pressure;
- and
- a pneumatic pump and a pneumatic line extending outside the pneumatic pump so as to allow direct pneumatic communication between a negative pressure side of the pneumatic pump and a positive pressure side of the pneumatic pump, the pneumatic pump using the pneumatic line to simultaneously supply (i) positive pneumatic pressure to the positive pneumatic pressure source and (ii) negative pneumatic pressure to the negative pneumatic pressure source.
A method for pneumatically operating a medical fluid machine in operable communication with a medical fluid cassette, the method comprising:
- simultaneously supplying (i) positive pneumatic pressure to a positive pneumatic pressure source and (ii) negative pneumatic pressure to a negative pneumatic pressure source via a pneumatic pump and a pneumatic line extending outside the pneumatic pump so as to allow direct pneumatic communication between a positive pressure side of the pneumatic pump and a negative pressure side of the pneumatic pump;
- allowing the medical fluid cassette to receive positive pneumatic pressure from the positive pneumatic pressure source;
- and
- allowing the medical fluid cassette to receive negative pneumatic pressure from the negative pneumatic pressure source.
Dependencies are inferred from the claim text.