Weight controlled dialysis system with accelerometer

• US 7,789,850 B2
• Filed: 01/22/2007
• Issued: 09/07/2010
• Est. Priority Date: 01/22/2007
• Status: Expired due to Fees

• Current Assignee: Baxter Healthcare SA (Baxter International Inc.), Baxter International Inc.
• Original Assignee: Baxter Healthcare SA (Baxter International Inc.), Baxter International Inc.
• Inventors: Roger, Rodolfo
• Primary Examiner(s): Lucchesi; Nicholas D
• Assistant Examiner(s): Vu; Quynh-Nhu H
• Application Number:
  US11/625,637
• Publication Number:
  US 20080177222A1
• Time in Patent Office: 1,324 Days
• Field of Search: 604/7, 604/29, 604/65, 604/67, 604/131, 604/156, 417/36, 417/43, 417/44.2, 738/625.43, 731/526.1, 731/68, 738/638.3, 738/643.4
• US Class Current: 604/29
• CPC Class Codes: A61M 1/152 Details related to the interface between cassette and machine
• CPC Class Codes: A61M 1/16 with membranes
• CPC Class Codes: A61M 1/1613 Profiling or modelling of patient or predicted treatment evolution or outcome
• CPC Class Codes: A61M 1/1643 with weighing of fresh and used dialysis fluid
• CPC Class Codes: A61M 1/28 Peritoneal dialysis ; Other peritoneal treatment, e.g. oxygenation
• CPC Class Codes: A61M 1/284 Continuous flow peritoneal dialysis [CFPD]
• CPC Class Codes: A61M 1/341 by measuring the filtrate rate or volume
• CPC Class Codes: A61M 1/36222 Details related to the interface between cassette and machine
• CPC Class Codes: A61M 2205/18 with alarm
• CPC Class Codes: A61M 2205/3393 by weighing the reservoir
• CPC Class Codes: A61M 2205/50 with microprocessors or computers

Abstract

A dialysis system includes: an enclosure; a dialysate pump carried by the enclosure and arranged to pump dialysate to a patient or dialyzer; at least one container connected fluidly to the dialysate pump; a load cell positioned to weigh dialysate located within the container; an accelerometer positioned and arranged to detect a force imparted on at least one of the enclosure and the container; and electronics configured to receive a first signal from the load cell and a second signal from the accelerometer and process the first and second signals so as to determine if an abnormality sensed by the load cell is a system error or a mechanical interference.

Claims

1. A dialysis system comprising:

an enclosure;

a dialysate pump carried by the enclosure and arranged to pump dialysate to a patient or dialyzer;

at least one container connected fluidly to the dialysate pump;

a load cell positioned to weigh dialysate located within the at least one container;

an accelerometer positioned and arranged to detect a force imparted on at least one of the enclosure and the container; and

electronics configured to receive a first signal from the load cell and a second signal from the accelerometer and process the first and second signals so as to determine if an abnormality sensed by the load cell is a system error or a mechanical interference,

wherein the electronics are further configured such that if the second signal yields an abnormal accelerometer condition, the load cell abnormality is categorized as a mechanical interference.

2. The dialysis system of claim 1, wherein the pump in a supply pump, and which includes at least one drain pump connected fluidly to the container.

3. The dialysis system of claim 1, wherein the container includes at least one of a supply container, a drain container and an ultrafiltrate container.

4. The dialysis system of claim 1, wherein at least one of the load cell and the accelerometer is coupled operably to a pan or hook, the container loaded on the pan or hook.

5. The dialysis system of claim 1, wherein the mechanical interference includes a inadvertent force applied to the machine.

6. The dialysis system of claim 1, wherein the system error is at least one of a kinked line, a leak, a component failure and a sensor failure.

7. The dialysis system of claim 1, wherein the electronics are configured to process a plurality of the first signals to determine if a change in the first signals is out of a range of acceptable change.

8. The dialysis system of claim 1, wherein the electronics are configured to process a plurality of the second signals to determine if a change in the second signals is out of a range of acceptable change.

9. The dialysis system of claim 1, wherein the electronics are configured such that if the second signal yields a normal accelerometer condition, the load cell abnormality is categorized as a system error.

10. The dialysis system of claim 1, wherein the electronics are configured such that if the second signal yields an abnormal accelerometer condition, and the load cell abnormality and the abnormal accelerometer condition are consistent with a system failure, the load cell abnormality is categorized as a system error.

11. The dialysis system of claim 1, wherein the electronics are configured such that if the second signal yields an abnormal accelerometer condition, and the load cell abnormality and the abnormal accelerometer condition are inconsistent with any type of system error, the load cell abnormality is categorized as a mechanical interference.

12. The dialysis system of claim 1, wherein the electronics include at least one of:

a processor, a memory and a signal conditioner.

13. The dialysis system of claim 1, wherein the accelerometer is configured and positioned such that it does not weigh dialysate located within the at least one container.

14. A dialysis system comprising:

an enclosure;

a dialysate pump carried by the enclosure and arranged to pump dialysate to a patient or dialyzer;

at least one container connected fluidly to the dialysate pump;

a load cell positioned to weigh dialysate located within the at least one container;

an accelerometer positioned and arranged to detect a force imparted on at least one of the enclosure and the container; and

electronics configured to receive load cell data from the load cell and accelerometer data from the accelerometer and process the load cell and accelerometer data to determine if (i) the dialysis system is operating properly;

(ii) a system error has occurred;

or (iii) a mechanical interference has occurred,

wherein the electronics are configured to determine that system error has occurred if at least one of (a) the load cells data is out of a load cell data limit range and the accelerometer data is within an accelerometer data limit range and (b) the load cell data is out of the load cell data limit range, the accelerometer data is out of the accelerometer data limit range and the load cell data is dissimilar to the accelerometer data.

15. The dialysis system of claim 14, wherein the electronics are configured to determine that the system is operating properly if at least the load cell data is within a load cell data limit range.

16. The dialysis system of claim 14, wherein the electronics are configured to determine that mechanical interference has occurred if at least the accelerometer data is out of an accelerometer data limit range.

17. The dialysis system of claim 14, wherein the electronics are configured to determine that mechanical interference has occurred if the load cell data is out of a load cell data limit range, the accelerometer data is out of an accelerometer data limit range and the load cell data is similar to the accelerometer data.

18. The dialysis system of claim 14, wherein at least one of the load cell and accelerometer is configured to generate corresponding data continuously, intermittently or upon command.

19. The dialysis system of claim 14, wherein the accelerometer is configured and positioned such that it does not weigh dialysate located within the at least one container.

20. A dialysis system comprising:

an enclosure;

a dialysate pump carried by the enclosure and arranged to pump dialysate to a patient or dialyzer;

at least one container connected fluidly to the dialysate pump;

a load cell positioned to weigh dialysate located within the container;

an accelerometer positioned and arranged to detect a force imparted on at least one of the enclosure and the container; and

electronics configured to receive load cell data from the load cell and accelerometer data from the accelerometer and process the load cell and accelerometer data so as to compensate for errors in the load cell data using the accelerometer data,

wherein the electronics are configured to determine that mechanical interference has occurred if the load cell data is out of a load cell data limit range, the accelerometer data is out of an accelerometer data limit range and the load cell data is similar to the accelerometer data.

21. The dialysis system of claim 20, wherein the electronics are further configured to use the load cell and accelerometer data determine if:

(i) the dialysis system is operating properly;

(ii) a system error has occurred;

or (iii) a mechanical interference has occurred.

22. The dialysis system of claim 20, wherein the accelerometer is a multidimensional accelerometer and the electronics are configured to compensate the load cell data based on at least one force detected by the accelerometer having a non-vertical vector direction.

23. A dialysis system comprising:

an enclosure;

a dialysate pump carried by the enclosure and arranged to pump dialysate to a patient or dialyzer;

at least one container connected fluidly to the dialysate pump;

a load cell positioned to weigh dialysate located within the at least one container;

an accelerometer positioned and arranged to detect a force imparted on at least one of the enclosure and the container; and

electronics configured to receive a first signal from the load cell and a second signal from the accelerometer and process the first and second signals so as to determine if an abnormality sensed by the load cell is a system error or a mechanical interference,

wherein the electronics are configured such that if the second signal yields an abnormal accelerometer condition, and the load cell abnormality and the abnormal accelerometer condition are consistent with a system failure, the load cell abnormality is categorized as a system error.