Peritoneal dialysis system using pressurized chamber and pumping bladder
AssigneesBaxter International Inc., Baxter Healthcare S.A.
InventorJohn Zafiris
Life of this patent
Estimating the term…
Abstract
A peritoneal dialysis system includes a chamber; a hydraulic pump; an inflatable bladder located within the chamber and in hydraulic fluid communication with the hydraulic pump; and a control unit configured to cause known amounts of hydraulic fluid to be metered to and from the inflatable bladder and to determine (i) a first amount of air before a discharge stroke via a first ideal gas law calculation, (ii) a second amount of air after the discharge stroke via a second ideal gas law calculation, and (iii) a discharge volume of fresh or used dialysis fluid for the discharge stroke by subtracting a difference between the first and second amounts of air from a known amount of hydraulic fluid metered to the inflatable bladder for the discharge stroke.
Claims28
A peritoneal dialysis system comprising:
- a chamber;
- a hydraulic pump;
- an inflatable bladder located within the chamber and in hydraulic fluid communication with the hydraulic pump;
- and
- a control unit configured to cause known amounts of hydraulic fluid to be metered to and from the inflatable bladder and to determine (i) a first amount of air before a discharge stroke via a first ideal gas law calculation, (ii) a second amount of air after the discharge stroke via a second ideal gas law calculation, and (iii) a discharge volume of fresh or used dialysis fluid for the discharge stroke by subtracting a difference between the first and second amounts of air from a known amount of hydraulic fluid metered to the inflatable bladder for the discharge stroke.
A peritoneal dialysis system comprising:
- a hydraulic pump including or operating with a hydraulic fluid storage area;
- a chamber;
- an inflatable bladder located within the chamber and in hydraulic fluid communication with the hydraulic pump;
- a disposable set including a flexible container insertable within the chamber;
- and
- a control unit configured to cause hydraulic fluid to be reuseably (i) pulled from the inflatable bladder into the hydraulic fluid storage area in a draw stroke in which fresh or used dialysis fluid is pulled into the flexible container and (ii) pushed from the hydraulic fluid storage area into the inflatable bladder in a discharge stroke in which fresh or used dialysis fluid is pushed from the flexible container.
A peritoneal dialysis system comprising:
- a hydraulic pump;
- a chamber;
- an inflatable bladder located within the chamber and in hydraulic fluid communication with the hydraulic pump;
- and
- a control unit configured to cause
- (i) a draw stroke in which a measured amount of hydraulic fluid is removed from the inflatable bladder to draw fresh or used dialysis fluid into the chamber,
- (ii) a first air amount determination to be made by taking pressure measurements before and after attempting to compress air within the chamber,
- (iii) a discharge stroke in which a measured amount of hydraulic fluid is delivered to the inflatable bladder to discharge fresh or used dialysis fluid from the chamber,
- (iv) a second air amount determination to be made by taking pressure measurements before and after attempting to compress air within the chamber and the flexible container, and
- (v) a discharge volume of fresh or used dialysis fluid for the discharge stroke to be determined by subtracting a difference between the first and second air amounts from the measured amount of hydraulic fluid delivered to the inflatable bladder for the discharge stroke.
Dependencies are inferred from the claim text.