# US 8,540,886 B2 · Dialysis cassettes and related systems and methods

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- Number: US 8,540,886 B2
- Document ID: US8540886B2
- Status: Granted
- Kind: B2
- Application number: 13/464,264
- Filed: 2012-05-04
- Published: 2012-08-30
- Granted: 2013-09-24
- Earliest claimed: 2008-08-18
- Assignees: Fresenius Medical Care Deutschland GmbH
- Applicants: Frank Hedmann; Stephan Klatte
- Inventors: Frank Hedmann; Stephan Klatte
- Web page: https://patentgrep.com/patent/US8540886B2

## CPC

- A61M 1/28: Peritoneal dialysis {; Other peritoneal treatment, e.g. oxygenation}
- A61M 1/152: {Details related to the interface between cassette and machine}
- A61M 1/153: {the cassette being adapted for heating or cooling the treating fluid, e.g. the dialysate or the treating gas}
- A61M 1/154: {with sensing means or components thereof}
- A61M 1/155: {with treatment-fluid pumping means or components thereof}
- A61M 1/156: {Constructional details of the cassette, e.g. specific details on material or shape}
- A61M 1/1565: {Details of valves}
- A61M 1/1656: {Apparatus for preparing dialysates}
- A61M 1/166: {Heating (for sterilisation A61M1/1686)}
- A61M 5/445: {the media being heated in the reservoir, e.g. warming bloodbags}
- A61M 1/159: {specially adapted for peritoneal dialysis}
- A61M 2205/127: with provisions for heating or cooling
- A61M 2205/3606: cooled
- A61M 2205/3626: by controlled mixing of fluids at different temperatures
- A61M: DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY (introducing media into or onto the bodies of animals A61D7/00; means for inserting tampons A61F13/26; devices for administering food or medicines orally A61J; containers for collecting, storing or administering blood or medical fluids A61J1/05); DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY (surgery A61B; chemical aspects of surgical articles A61L); DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR {(Electrotherapy, e.g. producing anaesthesia by the use of alternating or intermittent currents A61N1/36021)}

## Abstract

A method that includes conveying overheated dialysate through a cassette in a manner to reduce the temperature of the overheated dialysate, and a dialysis system including a control unit configured to cause overheated dialysate to be conveyed through a cassette in a manner to reduce the temperature of the overheated dialysate.

## Claims

### Claim 1

A method of controlling the temperature of liquid in a dialysis cassette, the method comprising:
pumping liquid heated to a temperature greater than a desired temperature from a first pump chamber of the dialysis cassette to a second pump chamber of the dialysis cassette, wherein the first pump chamber cooperates with a first pump to pump liquid within the dialysis cassette, and the second pump chamber cooperates with a second pump to pump liquid within the dialysis cassette; and
pumping the liquid from the second pump chamber of the dialysis cassette back to the first pump chamber of the dialysis cassette, wherein the liquid is pumped back and forth between the first and second pump chambers of the dialysis cassette until the liquid reaches the desired temperature.

### Claim 2 (depends on 1)

The method of claim 1, further comprising turning off a heating device configured to heat the liquid in the dialysis cassette, and closing an outlet passage formed in the cassette such that the liquid is substantially prevented from exiting the cassette via the outlet passage.

### Claim 3 (depends on 2)

The method of claim 2, wherein a fluid line is connected to the outlet passage and to a patient, and closing the outlet passage substantially prevents the liquid from being delivered via the fluid line to the patient.

### Claim 4 (depends on 1)

The method of claim 1, wherein unheated liquid is present in the second pump chamber when the liquid heated to a temperature greater than the desired temperature is pumped into the second pump chamber.

### Claim 5 (depends on 4)

The method of claim 4, wherein, when a mixture of the unheated liquid and the liquid heated to a temperature greater than the desired temperature in the second pump chamber is below a given temperature, the mixture is conveyed from the second pump chamber to an outlet passage, then to a heating region of the cassette, then to the first pump chamber.

### Claim 6 (depends on 4)

The method of claim 4, wherein, when a mixture of the unheated liquid and the liquid heated to a temperature greater than the desired temperature in the second pump chamber is above a given temperature, the mixture is conveyed from the second pump chamber to a heating region of the cassette, then to an outlet passage, then to the first pump chamber.

### Claim 7 (depends on 1)

The method of claim 1, further comprising sensing the temperature of liquid in the cassette.

### Claim 8 (depends on 7)

The method of claim 7, wherein the temperature of liquid in a heating region of the cassette is sensed.

### Claim 9 (depends on 7)

The method of claim 7, wherein the temperature of liquid in the first pump chamber of the cassette and the temperature of liquid in the second pump chamber of the cassette is sensed.