Method and system of monitoring electrolyte levels and composition using capacitance or induction

• US 9,201,036 B2
• Filed: 12/21/2012
• Issued: 12/01/2015
• Est. Priority Date: 12/21/2012
• Status: Active Grant

• Current Assignee: Fresenius Medical Care Holdings Incorporated (Fresenius SE & Co. KGaA)
• Original Assignee: Fresenius Medical Care Holdings Incorporated (Fresenius SE & Co. KGaA)
• Inventors: Fulkerson, Barry Neil, Gengarelly, Gregory Hayes, Nolan, Tam
• Primary Examiner(s): Kim, John
• Application Number:
  US13/725,178
• Publication Number:
  US 20140175012A1
• Time in Patent Office: 1,075 Days
• US Class Current: 1/1
• CPC Class Codes: A61M 1/14 Dialysis systems; Artificial kidneys; Blood oxygenators semi-permeable membranes characterised by the material, manufacturing processes therefor B01D71/00; Reciprocating systems for treatment of body fluids, e.g. single needle systems for hemofiltration or pheresis
• CPC Class Codes: A61M 1/1603 Regulation parameters
• CPC Class Codes: A61M 1/1605 Physical characteristics of the dialysate fluid
• CPC Class Codes: A61M 1/1668 Details of containers
• CPC Class Codes: A61M 2205/123 with incorporated reservoirs
• CPC Class Codes: A61M 2205/3317 Electromagnetic, inductive or dielectric measuring means
• CPC Class Codes: A61M 2205/3368 Temperature
• CPC Class Codes: A61M 2205/3389 Continuous level detection A61M2205/3393 takes precedence
• CPC Class Codes: G01F 23/268 mounting arrangements of probes
• CPC Class Codes: G01N 27/22 by investigating capacitance
• CPC Class Codes: G01N 27/226 Construction of measuring vessels; Electrodes therefor
• CPC Class Codes: G01N 27/228 Circuits therefor measuring capacitance per se G01R27/26

Abstract

Methods and systems for monitoring fluid levels and electrolyte levels used in a dialysis machine. A receptacle, configured to receive a container, comprises a plurality of curved side panels and a base to form a cylindrical shaped cavity for receiving a container. Each panel includes a conductive material on its inner surface and, optionally, a shielding on its outer surface. An electronics component housed within, or near, the receptacle drives the capacitive process and interprets generated data to determine fluid levels and compositions. An alternate receptacle includes one or two coils wrapped about the container and uses induction to determine fluid level.

Claims

1. A system for monitoring electrolytes in a fluid used in a dialysis machine, comprising:

a. a receptacle configured to receive a container, wherein said receptacle comprises an even numbered plurality of panels arranged in a pattern atop a base, wherein each of said panels comprises a concave inner surface facing said container and an outer surface opposite said inner surface, wherein each of said panels has a conductive material on its inner surface, and wherein each panel is electrically isolated from each other panel; and

b. a circuit in electrical communication with at least one of said plurality of panels;

wherein said circuit is configured to drive a capacitive process to generate characteristic data of said electrolytes.

2. The system for monitoring electrolytes of claim 1, wherein said receptacle in combination with said plurality of panels forms a structure defining a cavity that is substantially cylindrical.

3. The system for monitoring electrolytes of claim 1, wherein said circuit is housed within the base of the receptacle.

4. The system for monitoring electrolytes of claim 1, wherein said circuit is housed in a compartment located external to said receptacle.

5. The system for monitoring electrolytes of claim 1, wherein said conductive material is copper.

6. The system for monitoring electrolytes of claim 1, wherein said outer surface comprises a shielding material and wherein the shielding material is copper.

7. The system for monitoring electrolytes of claim 1, wherein each panel further comprises two side surfaces normal to said outer surface and wherein each side surface includes a fin extending outwardly from, and along, the entire vertical length of each side surface.

8. The system for monitoring electrolytes of claim 7, wherein the receptacle comprises four panels and wherein the fins of adjacent panels are in physical contact at said base of said receptacle but do not touch at the top edge of said receptacle.

9. The system for monitoring electrolytes of claim 1 further comprising a container for holding electrolytes and configured to snugly fit within said receptacle.

10. The system for monitoring electrolytes of claim 1 wherein said circuit drives the capacitive process to generate characteristic data of said electrolytes by generating an alternating current in a form of a stimulation wave and transmitting such wave to at least one of said plurality of panels and receiving a responsive wave generated by a panel opposing said one of said plurality of panels.

11. The system for monitoring electrolytes of claim 10 wherein said circuit drives the capacitive process to generate characteristic data of said electrolytes by further comparing data derived from said responsive wave to predetermined capacitance data for liquids with known levels and electrolyte compositions and determining a fluid level and a composition of the electrolytes in said fluid based on the data derived from the responsive wave and predetermined capacitance data.

12. The system for monitoring electrolytes of claim 10 wherein the receptacle further comprises a temperature sensor and wherein the circuit is configured to receive data indicative of a temperature from the temperature sensor, apply a function of said data and data generated from said capacitive process to generate an output, and compare said output to data derived from compositions of liquids having known levels of electrolytes and temperatures, and, based on said comparison, determine a composition of said electrolytes in said fluid.