US 12,447,250 B2Granted

Peritoneal dialysis system using pressurized chamber and pumping bladder

AssigneesBaxter International Inc., Baxter Healthcare S.A.

InventorJohn Zafiris

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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 a known amount of hydraulic fluid to be metered to the inflatable bladder and to determine (i) a first amount of air before a discharge stroke of the hydraulic pump via a first ideal gas law calculation, (ii) a second amount of air after the discharge stroke of the hydraulic pump 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 amount of air and the second amount of air from the known amount of hydraulic fluid metered to the inflatable bladder for the discharge stroke.

Claims25

Dependent claims

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;
a pressure sensor positioned and arranged to sense pneumatic pressure within the chamber;
a flexible container or bag removably placed inside the chamber, the flexible container or bag fluidly coupled to at least one fluid line and configured to receive fresh or used dialysis fluid;
at least one valve fluidly located between the flexible container or bag and the at least one fluid line;
and
a control unit configured to:
determine (i) a first amount of air within the flexible container or bag and/or the chamber before a discharge stroke of the hydraulic pump via a first ideal gas law calculation when the at least one valve is closed by:
(a) taking a first pressure reading via the pressure sensor,
(b) causing a first measurement amount of hydraulic fluid to be metered into the inflatable bladder, and
(c) taking a second pressure reading via the pressure sensor for use with the first ideal gas law calculation,
determine (ii) a second amount of air within the flexible container or bag and/or the chamber after the discharge stroke of the hydraulic pump via a second ideal gas law calculation when the at least one valve is closed by:
(a) taking a first pressure reading via the pressure sensor,
(b) causing a second measurement amount of the hydraulic fluid to be metered into the inflatable bladder, and
(c) taking a second pressure reading via the pressure sensor for use with the second ideal gas law calculation, and
determine (iii) a discharge volume of the fresh or used dialysis fluid from the flexible container or bag for the discharge stroke of the hydraulic pump by subtracting a difference between the first amount of air and the second amount of air from a known amount of the hydraulic fluid metered to the inflatable bladder for the discharge stroke.

14 more elements

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;
a pressure sensor positioned and arranged to sense pneumatic pressure within the chamber;
a flexible container or bag removably placed inside the chamber, the flexible container or bag fluidly coupled to at least one fluid line and configured to receive fresh or used dialysis fluid;
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 by the hydraulic pump to draw the fresh or used dialysis fluid into the flexible container or bag,
(ii) a first air amount determination to be made by taking pressure measurements using the pressure sensor before and after attempting to compress air within the chamber,
(iii) a discharge stroke in which a second measured amount of the hydraulic fluid is delivered to the inflatable bladder by the hydraulic pump to discharge the fresh or used dialysis fluid from the flexible container or bag,
(iv) a second air amount determination to be made by taking pressure measurements using the pressure sensor before and after attempting to compress the air within the chamber, and
(v) a discharge volume of the fresh or used dialysis fluid for the discharge stroke to be determined by subtracting a difference between the first air amount and the second air amount from the second measured amount of the hydraulic fluid delivered to the inflatable bladder for the discharge stroke.

9 more elements

Dependencies are inferred from the claim text.

Facts

Application: 17/400,688Filed 12 Aug 2021 · us provisional application
Priority: 18 Aug 2020
Published: US 2022/0054723 A124 Feb 2022
Granted: 21 Oct 2025
Term ends: Not estimatedThe source records don’t support an estimate.

Classification13 codes

A61M 1/28
Dialysis systems; Artificial kidneys; Blood oxygenators ; Reciprocating systems for treatment of body fluids, e.g. single needle systems for…:…
A61M 1/281
Peritoneal dialysis ; Other peritoneal treatment, e.g. oxygenation: instillation other than by gravity
A61M 1/1601
With membranes: control or regulation
A61M 1/1641
With volume chamber balancing devices between used and fresh dialysis fluid: linked by pistons