# US 4,399,030 A · Rinsing, cleaning and disinfecting dialysate preparation and supply apparatus

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- Number: US 4,399,030 A
- Document ID: US4399030A
- Status: Granted
- Kind: A
- Application number: 06/258,424
- Filed: 1981-04-28
- Granted: 1983-08-16
- Earliest claimed: 1981-04-28
- Assignees: Cobe Laboratories, Inc.
- Inventors: Dennis J. Hlavinka; Steven H. Johnson; James L. Zook
- Web page: https://patentgrep.com/patent/US4399030A

## CPC

- A61M 1/169: {using chemical substances}
- A61M 2205/14: Detection of the presence or absence of a tube, a connector or a container in an apparatus
- A61M 2205/6081: Colour codes
- Y10S 210/929: Hemoultrafiltrate volume measurement or control processes
- 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)}
- Y10S: TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS

## Abstract

A cleaning and/or disinfecting system for flushing water and chemical treatment liquids through the hydraulic circuitry of dialysate preparation and supply apparatus, the system employing, for each particular treatment liquid of a plurality of possible liquids, a keyhole adjacent to a chemical intake port and means to send electrical signals to an electrical controller indicating the presence of a key within a particular keyhole, whereby the particular treatment liquid connected to the port is flushed through the hydraulic circuitry of the apparatus at the proper flowrate and for the desired period of time.

## Claims

### Claim 1

Dialysate preparation and supply apparatus having a water intake port, a concentrated dialysate solution intake connector, dialysate connectors for delivering fresh dialysate to and removing spent dialysate from a dialyzer, and system pumps for pumping liquids through hydraulic circuitry connected to said intake ports, said hydraulic circuitry including said dialysate connectors, said apparatus further comprising a cleaning and/or disinfecting system comprising
a chemical intake port on an accessible exterior surface of said apparatus for connection to sources of different treatment liquids, one at a time,
said port being connected to said hydraulic circuitry,
means for regulating the flow of liquid from said chemical port into said hydraulic circuitry,
means for providing a plurality of keyholes corresponding to said different treatment liquids in said exterior surface at different locations, each said keyhole being adapted to receive a corresponding key on a treatment liquid connector connected to a source of one said treatment liquid, each said keyhole being adapted to not receive any key corresponding to any other said treatment liquid,
means associated with said keyholes for sending electrical signals indicating the presence of a said key in a corresponding said keyhole, and
electrical control means for controlling said pumps and said means for regulating, to pump one of said different treatment liquids for a specific period of time and at a specific flowrate depending on which keyhole has a key in it.

### Claim 2 (depends on 1)

The system of claim 1 further comprising a water valve between said water intake port and said hydraulic circuitry, and wherein said electrical control means is adapted to cause, upon receiving electrical signals indicating connection of one said treatment liquid, said chemical pump to pump said treatment liquid into said hydraulic circuitry for a period of time long enough to allow said hydraulic circuitry to be filled with diluted treatment fluid and then close said water valve and deactivate said system and chemical pumps to allow said hydraulic circuitry to soak with said treatment liquid.

### Claim 3 (depends on 1)

The system of claim 1 wherein said one treatment liquid is bleach.

### Claim 4 (depends on 2)

The system of claim 2 wherein said one treatment liquid is disinfectant.

### Claim 5 (depends on 4)

The system of claim 4 wherein said disinfectant is formaldehyde.

### Claim 6 (depends on 1, 2, 3, 4)

The system of claim 1, 2, 3 or 4 wherein each said key is a different color, and each said means for providing keyholes is of the same color as its corresponding key.