Dialysis system and method for cassette-based pumping and valving

Patent metadata

Field	Value
Publication number	US-9283312-B2
Application number	US-98773811-A
Country	US
Kind code	B2
Filing date	Jan 10, 2011
Priority date	Jul 19, 2002
Publication date	Mar 15, 2016
Grant date	Mar 15, 2016

Abstract

A peritoneal dialysis system includes a disposable cassette including a flexible sheet; a hardware unit including (i) at least one pump actuator and piston head moved by the pump actuator, (ii) at least one valve actuator, (iii) at least one sensor, and (iv) a disposable cassette interface for interfacing with the disposable cassette, the disposable cassette interface including: (a) at least one pump aperture, the at least one piston head moveable out of and retractable into the at least one pump aperture to move a corresponding pumping portion of the flexible sheet of the disposable cassette, the piston head moving within a vacuum chamber, the vacuum chamber enabling a vacuum to be pulled around the piston head to the flexible sheet of the disposable cassette; (b) at least one valve aperture, at least a portion of the at least one valve actuator located in the valve aperture to move a valve portion of the flexible sheet of the disposable cassette; and (c) at least one sensor aperture, the at least one sensor located in the at least one sensor aperture, the at least one sensor operable with a sensor portion of the flexible sheet of the disposable cassette.

First claim

The invention is claimed as follows:

1. A peritoneal dialysis system comprising:
a disposable cassette including a flexible sheet defining a pumping portion of a pump chamber;
a hardware unit including (i) at least one pump actuator and piston head moved by the pump actuator, (ii) at least one valve actuator, (iii) at least one sensor, and (iv) a disposable cassette interface for interfacing with the disposable cassette, the disposable cassette interface including:
(a) at least one pump aperture, the at least one piston head moveable out of and retractable into the at least one pump aperture to move the pumping portion of the flexible sheet of the disposable cassette, the piston head moving within a vacuum chamber, the vacuum chamber enabling a vacuum to be pulled around the piston head to the flexible sheet of the disposable cassette;
(b) at least one valve aperture, at least a portion of the at least one valve actuator located in the valve aperture to move a valve portion of the flexible sheet of the disposable cassette; and
(c) at least one sensor aperture, the at least one sensor located in the at least one sensor aperture, the at least one sensor operable with a sensor portion of the flexible sheet of the disposable cassette.

2. The peritoneal dialysis system of claim 1 , wherein the valve actuator is operated at least partially using negative pressure.

3. The peritoneal dialysis system of claim 1 , wherein the pump actuator includes a linear motor.

4. The peritoneal dialysis system of claim 1 , wherein the pump actuator includes a rotary motor coupled to a rotational to linear motion converter.

5. The peritoneal dialysis system of claim 1 , wherein the pump actuator includes a stepper motor.

6. The peritoneal dialysis system of claim 1 , wherein the disposable cassette interface includes a plate, the plate defining a vacuum aperture through which the vacuum is pulled around the piston head to the flexible sheet of the disposable cassette.

7. The peritoneal dialysis system of claim 6 , wherein the pump actuator extends through the plate adjacent to the aperture.

8. The peritoneal dialysis system of claim 6 , wherein the pump actuator is mounted to the plate.

9. The peritoneal dialysis system of claim 1 , wherein the valve actuator is shaped to occlude a valve seat of the flexible sheet of the disposable cassette.

10. The peritoneal dialysis system of claim 1 , wherein the hardware unit further includes a door placed in a hinged relationship with respect to the disposable cassette interface, the door and the disposable cassette interface holding the disposable cassette in place for operation.

11. The peritoneal dialysis system of claim 10 , wherein the door includes an inflatable bladder configured to apply a holding pressure to the disposable cassette.

12. A peritoneal dialysis system comprising:
a disposable cassette including a flexible sheet defining a pumping portion of a pump chamber;
a pump actuator;
a piston head moved by the pump actuator;
a disposable cassette interface for interfacing with the disposable cassette, the disposable cassette interface including a pump opening, the piston head moveable out of and retractable into the pump opening to move the pumping portion of the flexible sheet of the disposable cassette, the piston head moving within a vacuum chamber, the vacuum chamber enabling a vacuum to be pulled around the piston head to the flexible sheet of the disposable cassette; and
a plate through which the pump actuator extends towards the pump opening of the disposable cassette interface, the plate defining a vacuum aperture through which the vacuum is pulled around the piston head to the flexible sheet of the disposable cassette.

13. The peritoneal dialysis system of claim 12 , wherein the plate is part of an assembly with the disposable cassette interface.

14. The peritoneal dialysis system of claim 12 , which includes a pneumatic line extending from the plate and in fluid communication with the vacuum aperture, the pneumatic line for communicating with a vacuum source.

15. The peritoneal dialysis system of claim 12 , wherein the plate defines a pump hole for enabling the pump actuator to extend through the plate.

16. The peritoneal dialysis system of claim 12 , wherein the vacuum aperture is a first vacuum aperture, and wherein the plate defines a second aperture for enabling a vacuum to be applied to a valve actuator, the valve actuator operable with the flexible sheet of the disposable cassette.

17. The peritoneal dialysis system of claim 16 , wherein the valve actuator is operable with the flexible sheet of the disposable cassette via a valve opening in the disposable cassette interface.

18. A peritoneal dialysis system comprising:
a disposable cassette including a flexible sheet defining a pumping portion of a pump chamber;
a pump actuator;
a piston head moved by the pump actuator;
a disposable cassette interface for interfacing with the disposable cassette, the disposable cassette interface including a pump opening, the piston head moveable out of and retractable into the pump opening to move the pumping portion of the flexible sheet of the disposable cassette, the piston head moving within a vacuum chamber, the vacuum chamber enabling a vacuum to be pulled around the piston head to the flexible sheet of the disposable cassette; and
a plate to which the pump actuator is mounted, the plate defining a vacuum aperture through which the vacuum is pulled around the piston head to the flexible sheet of the disposable cassette.

19. The peritoneal dialysis system of claim 18 , wherein the vacuum aperture is a first vacuum aperture, and wherein the plate defines a second aperture for enabling a vacuum to be applied to a valve actuator, the valve actuator operable with the flexible sheet of the disposable cassette.

20. The peritoneal dialysis system of claim 19 , wherein the valve actuator is operable with the flexible sheet of the disposable cassette via a valve opening in the disposable cassette interface.

Assignees

• Childers Robert W
• Avoy Richard
• Booras John
• Bowman Jr Joseph H
• Grippo Paul
• Hopping Andrew D
• Howard David
• Jerrell Jeffrey W
• Kellam Benjamin
• Lauman Brian
• Shang Sherwin
• Vescovi David
• Yang Tahua
• Yu Alex
• Baxter Int
• Baxter Healthcare Sa

Inventors

• Childers Robert W
• Avoy Richard
• Booras John
• Bowman Jr Joseph H
• Grippo Paul
• Hopping Andrew D
• Howard David
• Jerrell Jeffrey W
• Kellam Benjamin
• Lauman Brian
• Shang Sherwin
• Vescovi David
• Yang Tahua
• Yu Alex

Classifications

• A61M2205/122

  using evacuated interfaces to enhance contact · CPC title

• A61M1/16

  with membranes · CPC title

• A61M1/28

  Peritoneal dialysis {; Other peritoneal treatment, e.g. oxygenation} · CPC title

• A61M1/284

  Continuous flow peritoneal dialysis [CFPD] · CPC title

• A61M1/1696 Primary

  with dialysate regeneration · CPC title