Peritoneal dialysis machine
AssigneesBaxter International Inc., Baxter Healthcare S.A.
InventorRobert W. Childers
Life of this patent
Estimating the term…
Abstract
A method for operating a dialysis cassette including a flexible membrane that covers a pump chamber includes allowing a source of fluid to fluidly communicate with the pump chamber of the dialysis cassette, filling the pump chamber with the fluid from the source, mechanically extending the flexible membrane into the pump chamber with a piston head to expel the fluid from the pump chamber through a flow path, and directly sensing a pressure of the fluid flowing through the flow path at a location of the dialysis cassette adjacent to the pump chamber and using the sensed pressure to perform a test prior to delivering fluid to a patient.
Claims28
A method for operating a dialysis cassette including a flexible membrane that covers a pump chamber, the method comprising:
- allowing a source of fluid to fluidly communicate with the pump chamber of the dialysis cassette;
- filling the pump chamber with the fluid from the source;
- mechanically extending the flexible membrane into the pump chamber with a piston head to expel the fluid from the pump chamber through a flow path;
- and
- directly sensing a pressure of the fluid flowing through the flow path at a location of the dialysis cassette adjacent to the pump chamber and using the sensed pressure to perform a test prior to delivering fluid to a patient.
A method for operating a dialysis cassette including a flexible membrane that covers a pump chamber, the method comprising:
- allowing a source of fluid to fluidly communicate with the pump chamber of the dialysis cassette;
- filling the pump chamber with the fluid from the source;
- pushing the flexible membrane into the pump chamber to expel the fluid from the pump chamber through a flow path;
- directly sensing a pressure of the fluid flowing through the flow path at a location of the dialysis cassette adjacent to the pump chamber;
- and
- determining that a line occlusion has occurred based on the sensed pressure.
A method for operating a dialysis cassette including a flexible membrane that covers a pump chamber, the method comprising:
- filling the pump chamber with fluid;
- monitoring movement of a piston head pushing the flexible membrane into the pump chamber;
- and
- determining that a leak in the dialysis cassette has occurred if the piston head moves when the piston head is expected to remain stationary.
A dialysis machine comprising:
- a housing;
- a mechanically actuated piston head extending from a pump actuator housed by the housing, the mechanically actuated piston head positioned to extend towards and away from a fluid pumping cassette, the fluid pumping cassette coupled operably to the housing such that a flexible membrane of the fluid pumping cassette faces the piston head so that the piston head can push the flexible membrane into a pump chamber of the fluid pumping cassette to expel a fluid from the pump chamber;
- a pressure sensor located adjacent to the mechanically actuated piston head so as to sense a pressure of the fluid moved by the mechanically actuated piston head within the fluid pumping cassette;
- and
- a controller programmed to use the sensed pressure to perform a test prior to delivering fluid to a patient.
A dialysis machine comprising:
- a housing;
- a mechanically actuated piston head extending from a pump actuator housed by the housing, the mechanically actuated piston head positioned to extend towards and away from a fluid pumping cassette, the fluid pumping cassette coupled operably to the housing such that a flexible membrane of the fluid pumping cassette faces the piston head so that the piston head can push the flexible membrane into a pump chamber of the fluid pumping cassette to expel a fluid from the pump chamber;
- a pressure sensor located adjacent to the mechanically actuated piston head so as to sense a pressure of the fluid moved by the mechanically actuated piston head within the fluid pumping cassette;
- and
- a controller programmed to use the sensed pressure to determine whether a line occlusion has occurred.
A dialysis machine comprising:
- a housing;
- a mechanically actuated piston head extending from a pump actuator housed by the housing, the mechanically actuated piston head positioned to extend towards and away from a fluid pumping cassette, the fluid pumping cassette coupled operably to the housing such that a flexible membrane of the fluid pumping cassette faces the piston head so that the piston head can push the flexible membrane into a pump chamber of the fluid pumping cassette to expel a fluid from the pump chamber;
- and
- a controller programmed to perform a leak test by monitoring a sensed position of the mechanically actuated piston head while the mechanically actuated piston head applies a force to the flexible membrane of the fluid pumping cassette.
Dependencies are inferred from the claim text.