# US 9,433,718 B2 · Medical fluid system including radio frequency (RF) device within a magnetic assembly, and fluid cartridge body with one of multiple passageways disposed within the RF device, and specially configured cartridge gap accepting a portion of said RF device

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- Number: US 9,433,718 B2
- Document ID: US9433718B2
- Status: Granted
- Kind: B2
- Application number: 13/836,992
- Filed: 2013-03-15
- Published: 2014-09-18
- Granted: 2016-09-06
- Earliest claimed: 2013-03-15
- Assignees: Fresenius Medical Care Holdings, Inc.
- Applicants: Fresenuis Medical Care Holdings, Inc.
- Inventors: Ross Peter Jones
- Web page: https://patentgrep.com/patent/US9433718B2

## CPC

- G01N 24/087: {Structure determination of a chemical compound, e.g. of a biomolecule such as a protein}
- A61M 1/152: {Details related to the interface between cassette and machine}
- A61M 1/154: {with sensing means or components thereof}
- A61M 1/1562: {Details of incorporated reservoirs}
- A61M 1/1605: {Physical characteristics of the dialysate fluid}
- A61M 1/1621: {Constructional aspects thereof (semi-permeable membranes for separation processes characterised by their properties B01D69/00; semi permeable membranes characterised by their material B01D71/00)}
- A61M 1/1654: {Dialysates therefor}
- A61M 1/1656: {Apparatus for preparing dialysates}
- A61M 1/1668: {Details of containers}
- A61M 1/3609: {Physical characteristics of the blood, e.g. haematocrit, urea}
- A61M 1/36222: {Details related to the interface between cassette and machine}
- A61M 1/36224: {with sensing means or components thereof}
- A61M 1/36226: {Constructional details of cassettes, e.g. specific details on material or shape}
- A61M 1/3681: {by irradiation}
- G01N 33/4925: {measuring blood gas content, e.g. O2, CO2 , HCO3}
- G01R 33/307: {specially adapted for moving the sample relative to the MR system, e.g. spinning mechanisms, flow cells or means for positioning the sample inside a spectrometer}
- A61M 2205/12: with interchangeable cassettes forming partially or totally the fluid circuit
- A61M 2205/52: with memories providing a history of measured variating parameters of apparatus or patient
- A61M 2205/60: with identification means
- A61M 2205/75: with filters
- A61M 2230/20: Blood composition characteristics
- G01R 33/34092: {RF coils specially adapted for NMR spectrometers}
- G01R 33/3635: {Multi-frequency operation}
- G01R 33/3806: {Open magnet assemblies for improved access to the sample, e.g. C-type or U-type magnets}
- G01R 33/383: using permanent magnets
- G01R 33/465: applied to biological material, e.g. in vitro testing
- G01N: INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES (measuring or testing apparatus or processes other than immunoassay, involving enzymes or microorganisms C12M, C12Q)
- 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)}
- G01R: MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES (indicating correct tuning of resonant circuits H03J3/12)

## Abstract

This disclosure relates to medical fluid sensors and related systems and methods. In some aspects, a medical fluid cartridge includes a body including a first portion defining a first fluid passageway and a second portion defining a second fluid passageway in fluid communication with the first fluid passageway. The body defines a gap between the first portion of the body and the second portion of the body such that the first portion of the body can be disposed in a radio frequency device while the second portion of the body remains outside the radio frequency device.

## Claims

### Claim 1

A medical fluid system comprising:
a medical fluid pumping machine;
a magnet assembly defining a cavity in which a radio frequency device is positioned, the magnet assembly being configured to generate a magnetic field within the cavity; and
a medical fluid cartridge comprising:
a body having:
a first portion defining a first fluid passageway and
a second portion defining a second fluid passageway in fluid communication with the first fluid passageway, the first and second portions defining a gap therebetween, and the gap being sized and shaped to accept a portion of the radio frequency device to allow the first portion of the body to be disposed within the radio frequency device while the second portion of the body is disposed within the cavity defined by the magnet assembly and outside the radio frequency device.

### Claim 2 (depends on 1)

The medical fluid system of claim 1, wherein the magnet assembly is part of the medical fluid pumping machine.

### Claim 3 (depends on 2)

The medical fluid system of claim 2, wherein the magnet assembly is part of a module that is releasably attached to a housing of the medical fluid pumping machine.

### Claim 4 (depends on 1)

The medical fluid system of claim 1, further comprising a medical fluid line connected to the cartridge to carry medical fluid to the cartridge.

### Claim 5 (depends on 4)

The medical fluid system of claim 4, wherein the medical fluid pumping machine comprises a pump that is operably connected to the medical fluid line to pump medical fluid to the cartridge.

### Claim 6 (depends on 1)

The medical fluid system of claim 1, wherein the medical fluid pumping machine is a dialysis machine.

### Claim 7 (depends on 1)

The medical fluid system of claim 1, wherein the medical fluid cartridge is removable from the cavity of the magnet assembly.

### Claim 8 (depends on 1)

The medical fluid system of claim 1, wherein the first fluid passageway is a meandering fluid passageway.

### Claim 9 (depends on 8)

The medical fluid system of claim 8, wherein the second fluid passageway is a meandering fluid passageway.

### Claim 10 (depends on 1)

The medical fluid system of claim 1, wherein the medical fluid cartridge comprises a fluid inlet port via which medical fluid enters the medical fluid cartridge and a fluid outlet port via which medical fluid exits the medical fluid cartridge.

### Claim 11 (depends on 10)

The medical fluid system of claim 10, wherein the first fluid passageway is configured such that fluid flows through the first fluid passageway at a rate that is lower than a rate at which the medical fluid flows through the fluid inlet port.

### Claim 12 (depends on 11)

The medical fluid system of claim 11, wherein the first fluid passageway is a meandering fluid passageway.

### Claim 13 (depends on 10)

The medical fluid system of claim 10, wherein the second fluid passageway is configured such that fluid flows through the second fluid passageway at a rate that is lower than a rate at which the medical fluid flows through the fluid inlet port.

### Claim 14 (depends on 13)

The medical fluid system of claim 13, wherein a flow area of the second fluid passageway is greater than a flow area of the fluid inlet port.

### Claim 15 (depends on 14)

The medical fluid system of claim 14, wherein the second fluid passageway is a meandering fluid passageway.

### Claim 16 (depends on 1)

The medical fluid system of claim 1, wherein the body comprises a third portion having a third fluid passageway, the first and second portions extending from the third portion in a same plane.

### Claim 17 (depends on 16)

The medical fluid system of claim 16, wherein the third fluid passageway is a straight fluid passageway.

### Claim 18 (depends on 16)

The medical fluid system of claim 16, wherein the medical fluid cartridge comprises a fluid inlet port via which medical fluid enters the medical fluid cartridge and a fluid outlet port via which medical fluid exits the medical fluid cartridge.

### Claim 19 (depends on 18)

The medical fluid system of claim 18, wherein the third fluid passageway is configured such that fluid flows through the third fluid passageway at a rate that is lower than a rate at which the medical fluid flows through the fluid inlet port and that is greater than rates at which the medical fluid flows through the first and second fluid passageways.

### Claim 20 (depends on 19)

The medical fluid system of claim 19, wherein a flow area of the third fluid passageway is greater than a flow area of the second fluid passageway.

### Claim 21 (depends on 20)

The medical fluid system of claim 20, wherein the flow area of the third fluid passageway is at least 5 times greater than the flow area of the second fluid passageway.

### Claim 22 (depends on 19)

The medical fluid system of claim 19, wherein the first, second, and third fluid passageways are configured so that when fluid enters the fluid inlet port, a first portion of the fluid passes (i) from the fluid inlet port, (ii) through the second fluid passageway, (iii) to the first fluid passageway, and then (iv) to the fluid outlet port, and a second portion of the fluid passes (i) from the fluid inlet port, (ii) through the third fluid passageway and then (iii) to the fluid outlet port.

### Claim 23 (depends on 22)

The medical fluid system of claim 22, wherein at least one of the first and second fluid passageways is a meandering fluid passageway.

### Claim 24 (depends on 22)

The medical fluid system of claim 22, wherein the body comprises a wall that divides the second fluid passageway from the third fluid passageway near the fluid inlet port and a wall that divides the first fluid passageway from the third fluid passageway near the fluid outlet port.

### Claim 25 (depends on 1)

The medical fluid system of claim 1, wherein the medical fluid cartridge comprises indicia that indicates a volume of the first fluid passageway.

### Claim 26 (depends on 1)

The medical fluid system of claim 1, wherein the body is a solid body having an interior surface and an exterior surface, the interior surface defining the first and second passageways.

### Claim 27 (depends on 26)

The medical fluid system of claim 26, wherein the solid body is manufactured from a rigid material.

### Claim 28 (depends on 1)

The medical fluid system of claim 1, wherein the body comprises:
a base, and
a cover connected to the base, the cover and the base cooperating to form the first and second fluid passageways.

### Claim 29 (depends on 28)

The medical fluid system of claim 28, wherein the base comprises:
a plate having an irregular peripheral shape,
an outer sidewall extending in a direction normal to the flat plate along the periphery of the plate, and
an interior sidewall extending in a direction normal to the flat plate,
wherein the cover, the plate, the outer sidewall, and the inner sidewall form the first and second fluid passageways.