Non-Invasive Identification Of Solutions

• US 20150122997A1
• Filed: 01/06/2015
• Published: 05/07/2015
• Est. Priority Date: 11/09/2012
• Status: Abandoned Application

• Current Assignee: Fenwal Incorporated (Fresenius SE & Co. KGaA)
• Original Assignee: Fenwal Incorporated (Fresenius SE & Co. KGaA)
• Inventors: Sandford, Craig
• Application Number:
  US14/590,299
• Publication Number:
  US 20150122997A1
• Time in Patent Office: Days
• US Class Current: 250/338.1
• CPC Class Codes: A61M 1/0209 Multiple bag systems for separating or storing blood components
• CPC Class Codes: A61M 1/16 with membranes
• CPC Class Codes: A61M 1/342 Adding solutions to the blood, e.g. substitution solutions for preventing coagulation A61M1/3672
• CPC Class Codes: A61M 1/3609 Physical characteristics of the blood, e.g. haematocrit, urea
• CPC Class Codes: A61M 1/3621 Extra-corporeal blood circuits single-needle circuits A61M1/30
• CPC Class Codes: A61M 1/362227 the interface providing means for actuating on functional elements of the cassette, e.g. plungers
• CPC Class Codes: A61M 1/36225 with blood pumping means or components thereof
• CPC Class Codes: A61M 1/362265 Details of valves
• CPC Class Codes: A61M 1/367 Circuit parts not covered by the preceding subgroups of group A61M1/3621
• CPC Class Codes: A61M 1/3672 Means preventing coagulation
• CPC Class Codes: A61M 1/3693 using separation based on different densities of components, e.g. centrifuging
• CPC Class Codes: A61M 2205/18 with alarm
• CPC Class Codes: A61M 2205/3306 Optical measuring means
• CPC Class Codes: A61M 2205/3313 used specific wavelengths
• CPC Class Codes: A61M 2205/3334 Measuring or controlling the flow rate
• CPC Class Codes: G01N 21/25 Colour; Spectral properties, i.e. comparison of effect of material on the light at two or more different wavelengths or wavelength bands
• CPC Class Codes: G01N 33/4915 using flow cells flow cytometry G01N15/14

Abstract

A fluid identification assembly is provided to determine the presence or absence of multiple components within a fluid in a conduit. The assembly includes a light source and a light detector positioned to receive a portion of light from the light source reflected by the conduit and fluid. A dual-band bandpass filter may be associated with the light detector to allow multiple wavelengths of light to be monitored, thereby monitoring the composition of the fluid based on the amount of light of each wavelength absorbed by the fluid. Rather than a dual-band bandpass filter, a second light detector may be provided, along with a beam splitter to separate light from a single source for receipt of light of different wavelengths by the light detectors. The dual-band bandpass filter may also be replaced by a second light source and detector pair for analyzing fluid using multiple wavelengths of light.

Claims

1. A fluid identification assembly for use in combination with a fluid container, the fluid identification assembly comprising:

a light source configured to direct a light substantially transmitted by the fluid container to the fluid container for reflection by the fluid container and by a fluid present in the fluid container;

a light detector positioned to receive at least a portion of the reflected light; and

a dual-band bandpass filter positioned such that at least a portion of the light passes through the dual-band bandpass filter prior to being received by the light detector, wherein

the dual-band bandpass filter is configured to allow light having a first wavelength or a first range of wavelengths and a second wavelength or a second range of wavelengths to reach the light detector and to substantially prevent other wavelengths of light from reaching the light detector, and

the light detector is configured to, after receiving said at least a portion of the reflected light, generate a signal indicative of the identity of the fluid present in the fluid container based, at least in part, on the amount of light received from the light source.

2. The fluid identification assembly of claim 1, further comprising an amplifier associated with the light detector.

3. The fluid identification assembly of claim 1, wherein the dual-band bandpass filter is configured to allow the passage of two wavelengths of light that are substantially absorbed by different fluid components of an intravenous solution or the passage of two ranges of wavelengths of light including two wavelengths of light that are substantially absorbed by different fluid components of an intravenous solution.

4. The fluid identification assembly of claim 1, configured to differentiate between

a fluid including no fluid component that substantially absorbs light having the first wavelength or a wavelength within the first range of wavelengths and no fluid component that substantially absorbs light having the second wavelength or a wavelength within the second range of wavelengths,

a fluid including a fluid component that substantially absorbs light having the first wavelength or a wavelength within the first range of wavelengths, but no fluid component that substantially absorbs light having the second wavelength or a wavelength within the second range of wavelengths,

a fluid including a fluid component that substantially absorbs light having the second wavelength or a wavelength within the second range of wavelengths, but no fluid component that substantially absorbs light having the first wavelength or a wavelength within the first range of wavelengths, and

a fluid including a first fluid component that substantially absorbs light having the first wavelength or a wavelength within the first range of wavelengths and a second fluid component that substantially absorbs light having the second wavelength or a wavelength within the second range of wavelengths.

5. The fluid identification assembly of claim 1, wherein the light source is configured to emit an infrared light.

6. A fluid identification assembly for use in combination with a fluid container, the fluid identification assembly comprising:

a light source configured to direct a light substantially transmitted by the fluid container to the fluid container for reflection by the fluid container and by a fluid present in the fluid container;

a beam splitter positioned such that at least a portion of the light reflected by the fluid container and by the fluid present in the fluid container is intercepted by the beam splitter and separated into a first separated light beam and a second separated light beam;

a first light detector positioned to receive at least a portion of the first separated light beam; and

a second light detector positioned to receive at least a portion of the second separated light beam, wherein

the first light detector is configured to, after receiving said at least a portion of the first separated light beam, generate a first signal indicative of the presence or absence of a first fluid component in the fluid present in the fluid container based, at least in part, on the amount of light received from the light source, and

the second light detector is configured to, after receiving said at least a portion of the second separated light beam, generate a second signal indicative of the presence or absence of a second fluid component in the fluid present in the fluid container based, at least in part, on the amount of light received from the light source.

7. The fluid identification assembly of claim 6, wherein the beam splitter comprises a diffraction grating.

8. The fluid identification assembly of claim 6, further comprising

a first bandpass filter positioned such that at least a portion of the first separated light beam passes through the first bandpass filter prior to being received by the first light detector, and

a second bandpass filter positioned such that at least a portion of the second separated light beam passes through the second bandpass filter prior to being received by the second light detector, wherein

the first bandpass filter is configured to allow light having a first wavelength or a first range of wavelengths to reach the first light detector and to substantially prevent other wavelengths of light from reaching the first light detector,

the second bandpass filter is configured to allow light having a second wavelength or a second range of wavelengths to reach the second light detector and to substantially prevent other wavelengths of light from reaching the second light detector,

the first wavelength or a wavelength within the first range of wavelengths is selected to be substantially absorbed by the first fluid component, and

the second wavelength or a wavelength within the second range of wavelengths is selected to be substantially absorbed by the second fluid component.

9. The fluid identification assembly of claim 6, further comprising a first amplifier associated with the first light detector and a second amplifier associated with the second light detector.

10. The fluid identification assembly of claim 6, configured to detect the presence or absence of the first and second fluid components of an intravenous solution.

11. The fluid identification assembly of claim 6, configured to differentiate between

a fluid including neither the first fluid component nor the second fluid component,

a fluid including the first fluid component, but not the second fluid component,

a fluid including the second fluid component, but not the first fluid component, and

a fluid including the first and second fluid components.

12. A fluid identification assembly for use in combination with a fluid container, the fluid identification assembly comprising:

a first module including

a first light source configured to direct a first light substantially transmitted by the fluid container to the fluid container for reflection by the fluid container and by a fluid present in the fluid container, and

a first light detector positioned to receive at least a portion of the reflected first light; and

a second module including

a second light source configured to direct a second light substantially transmitted by the fluid container to the fluid container for reflection by the fluid container and by a fluid present in the fluid container, and

a second light detector positioned to receive at least a portion of the reflected second light, wherein

the first light detector is configured to, after receiving said at least a portion of the reflected first light, generate a first signal indicative of the presence or absence of a first fluid component in the fluid present in the fluid container based, at least in part, on the amount of light received from the first light source, and

the second light detector is configured to, after receiving said at least a portion of the reflected second light, generate a second signal indicative of the presence or absence of a second fluid component in the fluid present in the fluid container based, at least in part, on the amount of light received from the second light source.

13. The fluid identification assembly of claim 12, further comprising a light barrier positioned between the first and second modules.

14. The fluid identification assembly of claim 12, wherein one of the modules is positioned adjacent to and upstream of the other module.

15. The fluid identification assembly of claim 12, wherein

the first module includes a first bandpass filter positioned such that at least a portion of the first light passes through the first bandpass filter prior to being received by the first light detector,

the second module includes a second bandpass filter positioned such that at least a portion of the second light passes through the second bandpass filter prior to being received by the second light detector,

the first bandpass filter is configured to allow light having a first wavelength or a first range of wavelengths to reach the first light detector and to substantially prevent other wavelengths of light from reaching the first light detector,

the second bandpass filter is configured to allow light having a second wavelength or a second range of wavelengths to reach the second light detector and to substantially prevent other wavelengths of light from reaching the second light detector,

the first wavelength or a wavelength within the first range of wavelengths is selected to be substantially absorbed by the first fluid component, and

the second wavelength or a wavelength within the second range of wavelengths is selected to be substantially absorbed by the second fluid component.

16. The fluid identification assembly of claim 12, further comprising a first amplifier associated with the first light detector and a second amplifier associated with the second light detector.

17. The fluid identification assembly of claim 12, configured to detect the presence or absence of the first and second fluid components of an intravenous solution.

18. The fluid identification assembly of claim 12, configured to differentiate between

a fluid including neither the first fluid component nor the second fluid component,

a fluid including the first fluid component, but not the second fluid component,

a fluid including the second fluid component, but not the first fluid component, and

a fluid including the first and second fluid components.

19. The fluid identification assembly of claim 12, wherein at least one of the light sources is configured to emit an infrared light.

20. A fluid identification system including the fluid identification assembly of claim 12, and further comprising a fluid container including a first segment and a second segment formed of different materials or the same materials in different amounts, wherein

the first light is substantially transmitted by the first segment and directed to the fluid container by the first light source for reflection by the first segment and by a fluid present in the first segment, and

the second light is substantially transmitted by the second segment and directed to the fluid container by the second light source for reflection by the second segment and by a fluid present in the second segment.

21. A method for identifying a fluid in a fluid container comprising:

directing a light substantially transmitted by a fluid container to the fluid container for reflection by the fluid container and by a fluid present in the fluid container;

detecting reflected light having a first wavelength or a first range of wavelengths and a second wavelength or a second range of wavelengths; and

determining the identity of the fluid present in the fluid container based, at least in part, on the amount of reflected light detected.

22. The method of claim 21, wherein said detecting reflected light includes detecting reflected light passing through a dual-band bandpass filter configured to allow light having said first wavelength or first range of wavelengths and said second wavelength or second range of wavelengths to pass through the dual-band bandpass filter and to substantially prevent other wavelengths of light from passing through the dual-band bandpass filter.

23. The method of claim 21, further comprising splitting the reflected light into a first separated light beam and a second separated light beam prior to said detecting reflected light.

24. The method of claim 21, wherein

said directing a light includes directing first and second lights substantially transmitted by the fluid container to the fluid container for reflection by the fluid container and by the fluid present in the fluid container, and

said detecting reflected light includes detecting reflected first light having said first wavelength or first range of wavelengths using a first light detector and detecting reflected second light having said second wavelength or second range of wavelengths using a second light detector.

25. The method of claim 21, wherein said directing a light includes directing an infrared light to the fluid container for reflection by the fluid container and by the fluid present in the fluid container.