CA1192421A - Cuvette system for automated chemical analyzer - Google Patents
Cuvette system for automated chemical analyzerInfo
- Publication number
- CA1192421A CA1192421A CA000407619A CA407619A CA1192421A CA 1192421 A CA1192421 A CA 1192421A CA 000407619 A CA000407619 A CA 000407619A CA 407619 A CA407619 A CA 407619A CA 1192421 A CA1192421 A CA 1192421A
- Authority
- CA
- Canada
- Prior art keywords
- web
- cuvette
- optical
- belt
- receptacles
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01L—CHEMICAL OR PHYSICAL LABORATORY APPARATUS FOR GENERAL USE
- B01L3/00—Containers or dishes for laboratory use, e.g. laboratory glassware; Droppers
- B01L3/50—Containers for the purpose of retaining a material to be analysed, e.g. test tubes
- B01L3/505—Containers for the purpose of retaining a material to be analysed, e.g. test tubes flexible containers not provided for above
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/01—Arrangements or apparatus for facilitating the optical investigation
- G01N21/03—Cuvette constructions
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N35/00—Automatic analysis not limited to methods or materials provided for in any single one of groups G01N1/00 - G01N33/00; Handling materials therefor
- G01N35/02—Automatic analysis not limited to methods or materials provided for in any single one of groups G01N1/00 - G01N33/00; Handling materials therefor using a plurality of sample containers moved by a conveyor system past one or more treatment or analysis stations
- G01N35/021—Automatic analysis not limited to methods or materials provided for in any single one of groups G01N1/00 - G01N33/00; Handling materials therefor using a plurality of sample containers moved by a conveyor system past one or more treatment or analysis stations having a flexible chain, e.g. "cartridge belt", conveyor for reaction cells or cuvettes
- G01N2035/023—Automatic analysis not limited to methods or materials provided for in any single one of groups G01N1/00 - G01N33/00; Handling materials therefor using a plurality of sample containers moved by a conveyor system past one or more treatment or analysis stations having a flexible chain, e.g. "cartridge belt", conveyor for reaction cells or cuvettes forming cuvettes in situ, e.g. from plastic strip
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10S435/00—Chemistry: molecular biology and microbiology
- Y10S435/805—Test papers
Abstract
Abstract of the Disclosure A flexible and disposable cuvette belt is disclosed which comprises a matching pair of elongated webs joined together along corresponding faces thereof to form an integral belt. A series of regularly spaced chamber halves are formed laterally in each of the corresponding web faces which define open top cuvette receptacles when the web halves are joined.
Description
CUVETTE 5YSTEM FO~ AUTOMAT~D
~HEMICA~ ANALY7ER
Introduction The present invention relates to a cuvette system for use in the chemical analysis of fluid samples in an automated instrument and, more particularly to aflexible cuvette belt consisting of a plurality oE integrally interconnected cuvettes which is designed to be transported through the instrument.
Bac~<~round of the Invention A variety of automated or semi-automated chemical analy~ers are known which utilize cuvettes for the chemical testing of samples placed therein. Generally, a predetermined amount of liquid sample, such as a biological fluid, is placed in the cuvette which is then transported through theinstrument. As the cuvette is being transported, the instrument dispenses a quantity o~ reagent into the sample and monitors the resultin~ chemical reaction. Such monitorin~ is generally accomplished throu~h use of an optical means which views the fluid sample through optically transparent portions of the cuvette.
In order simplify the loading of the cuvettes into the instrument and facilitate their handling by the instrument once so loaded, proposals have been made to provide the cuvettes in the form oE a continuous integral strip. The individual cuvettes of the strip are designed to be relatlvely rigid, but the strip itself is provided with suff icient flexibility to ease its transport through the instrument. Furthermore, by making the cuvettes in a continuous strip form, they can be manuf actured relatively lnexpensively f rom suitable plastic material, thereby permitting their disposal after use. This is an important feature since it avoids the requirement for washing the cuvettes after use and avoids any possibility of cross-contamination of fluid samples which could cause erroneous test results. A proposed cuvette system designed to mee t these requirements is disclosed in U. S. Patent 4,263,256.
However, certain drawbacks have been observed in the design of such known cuvette systems which lirnit their use in automated chemical analyzers.
The drawbacks have generally involved the optical characteristics, dimensional tolerances and handling requirements of the integrally formed cuvette belts.
Brief Description of the Invention The cuvette system of the present invention overcomes the drawbacks found with known integrally formed cuvette belts by providing a practical, simplified desi~,n that is relatively inexpensive to manufacture to exacting optical tolerances and which is easily transported and aligned witnin the analyzer.
The cuvette belt of the present invention comprises a matching pair of elongated webs which are joined together along corresponding faces thereof to form an integral belt. A series of regularly spaced chamber halves are formed laterally in each of the corresponding web faces which define open top cuvette receptacles when the web halves are joined.
An indexing means is also disclosed for aligning the optical portion of the chamber halves when the webs are joined together, thereby defining a precise optical path through the cuvette. This indexing means may further serve to align the cuvette optical path with respect to the optical examining mechanism of the instrument as the cuvette belt is transported therethrough.
The two-piece structure of the present invention also perrnits novel manufacturing techniques to be employed which greatly simplify the production process and reduce the overall cost of the cuvette system. Such production advantages are achieved through the use of low cost thin plastic sheet stock material, with no resulting loss in optical precision or dimensional accuracy inthe cuvette. In fact, it has been founcl that cuvettes may be produc,~ed in accordance with the present invention that possess optical characteristics and dimensional accuracy heretofore obtainable only through use of injection molding techniques.
Therefore, an inexpensive disposable cuvette belt may be produced in accordance with the present invention which meets in all respects the precision optical requirements of modern chemical analyzers. The individual cuvettes of the present invention provide a precisely defined optical path through the ~cuvette that is extremely transparent at the wave leng,~s u tilized in such analyzers and which avoids any significant birefringence of the light beam passing therethrough.
In addition, such cuvettes may be easily manufactured with an elongated shape of srnall cross sectional area which is particularly suited for testing micro sample sizes of biological fluids.
Furthermore, the indexing means of cuvette belts designed in accordance with the present invention permits the precise and repeatable positioning of thecuvette optical path with respect to the optical system of the analyzer. Hence, a simplified transport mechanism may be utilized in the analyzer which allows a limited number of optical stations to view a relatively large number of different cuvettes during the period of time that the cuvettes are passed through the analyzer. Accordingly, the cuvette belt desi~n of the present invention also permits an overall reduction in the complexity and cost of the automated chemical analyzer in which it is used.
Description of the Drawin~s Figure 1 is a partial top plan view of an elongated thin plastic sheet stock material which may be utilized to form an embodiment of the present invention;
(--Figure 2 is an end view oE the material sl~own in Figure l;
Figure 3 is a top plan view of the material shown in Figure 1 I-aving chambers formed thereon in accord2nce with an embodiment oI the present invention;
Figure 4 is an end view of the ~ormed material shown in Figure 3;
Fi~ure 5 is a partlal side view of a cuvette belt formed in accordance with an embodiment of the present invention;
Figure 6 is an end view of the cuvette belt shown in Figure 5;
Figure 7 is a perspective view of a portion oE the cuvette belt shown in Figure 5;
Figure 8 is an enlarged side view of a portion of the cuvette belt shown in Figure 5;
!
Figure 9 is a sectional top view of the cuvette belt shown in Figure 8 taken along line 9-9 thereof~; and Figure 10 is a sectional end view of the cuvette belt shown in Figure 8 taken along the line 10-10 thereof.
Description of the Preferred Embodiment Figures 1 through 4 of the drawings illustrate the forming steps of a method by which a cuvette belt constructed in accordance with an embodiment of the present invention may be produced. This assembled cuvette belt 10 is illustrated in detail in Figures 5 through 10 of the drawings. 7 ?~
~ow~
As shown in Figures 1 and 2, cuvette belt 10 is forrned ~ a thin plastic .?~2 ^ ~/' web of sheet stock material 20 which is cut into elongated strips prior to the ~'~
~ ~0 ~/' ~3;~
formin~ operation. ~hese s-trips should be oE su~icient length to provicle a roll of cuvet-tes aEter forming as required ~or the continuous operation oE the analyzing instrwnent. It has been found that copolyester or vinyl plas-tic sheet s-tock in thickness of .003 to .010 inch provide satisfactory optical results when formed according to the present invention. An example of such a material is KODAR* brand thermoplastic poly-ester resin material manufactured by Eastman Kodak Co. In addition, in order to acilitate the fabrication and assembly of the cuvette belt, this sheet stock may be a laminate, hav-ing a layer of an easily sealable and biologically inert mat-erial such as SURLYN* brand ionomer resin material manufactured by E.I. Dupont DeNemours & Co., Inc.
Figures 3 and 4 illustrate sheet stock material2 having a series of regularly spaced chambers 12 formed laterally across its surface. In the preferred embodiment, these chambers are formed as narrow, shallow indentations having a generally rectangular shape. Since chambers 12 are shallow indentations, it is possible to form them utilizing cold molding techniques, thereby avoiding any optical degradation of the material due to heat. In addition, an optical portion 22 of the material may be restrained by clamping or other molding techniques during the chamber forming operation to avoid stretching or other deformation of it which would be detrimental to its optical performance. In this manner, essentially all stretch-ing of the material during the forming process is limi-ted to side walls 14 of the chamoers, and op-tical portions 22 there-of are maintained stress-free and with a uniform thic~ness.
A further advantaqe of the present invention is that a series of inde~ing perfora-tions30 may be formed a-long opposite longitudinal edges 21 of web material 20 during the chamber-forming operatlon. These edges of web ma~ also *Trademark ~`~ rlt ~ clampe~ durincl the onmincJ process so as to insure that a precis~ re-lationship is n~intained between inde~ing per~orations 30 and the cuvette opti~al window 2~1 utilizecl by the analyzing instrument. In the pre-~err~d ~n ~ diment, these optical windows 24 c~re located at opposite ends of ch~mber 1~ adjacent to indexin~ perforations 30 in order to insure tha-t precise ali3llmelltof them is repea-tably maintained durinct tr~nsport of the cuvette belt throucJh -the instrlment.
~ fter chamb~r 12 and indexinc3 perforations 30 are fonmed, web 20 is longi~ in~lly slit along its center line A-~. In this nanner t~o corresponding web halves 26, 27 are obtained which are identical in their configuration. Indexing perforations 30 are then u~ to precisely alicJn the ~eb halves with respec-t to each other as illustrated in Fic~ures S and 6, so that optical windows 24 will form a precise optical pa-th through the resulting cuvette or receptical 16 when web halves 26, 27 are joined along their corre~nn~;ng faces. The slitting step may beperfor~ed either before or aEter the web halves are joined.
As is best shown in Figure 7, whe~ joined toc~ether the ~h~mhPr hk-lves formed in ~eb halves 26. 27 will define receptacles 16 having an open top 17 adapted to receive and retain fluid sample ~not sho~m). The bcdy of these receptacles is elongated along central axis B-B extending through thier open tops. It has been found that web halves 26, 27 may be joined together about their periphery by a low heat sealin~ process if a laminate material havina a lo~ melting point layer such as SU~LY~I is u~;li7.e~,or by impulse bonding techniques if higher melting point materials are u~;l;7e~. Its is also possible to choose other joining methods, such as adhesive knn~;ng, as long as the optical characteristics and dimensional tolerances of the cuvettes are not adversely affected thereby.
In the particular embodument of the cuvette belt 10 shown in Figure 8 through 10, receptacles 16 are s~bstantially rectangular in cross section. Optical portions 22 oE the chamb~r halves 14 are opposite parallel ~alls of the rectangular receptacles, thereby providing on op-tical path of precise length through the cuvette.
As ~;c~cs~ above, after the cuvette belt is formedr indexing p~rfor~ n~ 30 may be u~ P~ as a means Eor aligning the optical pa~h through receptacles 16 with respect to the optical examinin~ system of the instrument (not shown). F~thermore, the spatial relationship 3bet~een indeYing perforations 30 and optical windows 24 will ]be precisely main-tained even though the cuve-tte ]belt is laterally fleYed or twisted about its longitu~;n~l edge 12 as transported from station to station in the instrument. In this connection, it is important that -the transport area 28 along longitudinal edge 21 not permitveLtical fleYing of the cuvette belt which could interfer with maintaining the proper vertical aligment of the cuvettes in the instrun ~ t.
/rl~
Although a specific embodiment of the present invention has been 7 ~ c described above and shown in the drawings, it is to be understoocl tl~t obvious ~-variations and modifications thereof falling within the scope and spirit of the present invention may be made as required by those skilled in the art. It is therefore intended that the following claims be construed as including such variations and mo~ifications of the present invention.
~HEMICA~ ANALY7ER
Introduction The present invention relates to a cuvette system for use in the chemical analysis of fluid samples in an automated instrument and, more particularly to aflexible cuvette belt consisting of a plurality oE integrally interconnected cuvettes which is designed to be transported through the instrument.
Bac~<~round of the Invention A variety of automated or semi-automated chemical analy~ers are known which utilize cuvettes for the chemical testing of samples placed therein. Generally, a predetermined amount of liquid sample, such as a biological fluid, is placed in the cuvette which is then transported through theinstrument. As the cuvette is being transported, the instrument dispenses a quantity o~ reagent into the sample and monitors the resultin~ chemical reaction. Such monitorin~ is generally accomplished throu~h use of an optical means which views the fluid sample through optically transparent portions of the cuvette.
In order simplify the loading of the cuvettes into the instrument and facilitate their handling by the instrument once so loaded, proposals have been made to provide the cuvettes in the form oE a continuous integral strip. The individual cuvettes of the strip are designed to be relatlvely rigid, but the strip itself is provided with suff icient flexibility to ease its transport through the instrument. Furthermore, by making the cuvettes in a continuous strip form, they can be manuf actured relatively lnexpensively f rom suitable plastic material, thereby permitting their disposal after use. This is an important feature since it avoids the requirement for washing the cuvettes after use and avoids any possibility of cross-contamination of fluid samples which could cause erroneous test results. A proposed cuvette system designed to mee t these requirements is disclosed in U. S. Patent 4,263,256.
However, certain drawbacks have been observed in the design of such known cuvette systems which lirnit their use in automated chemical analyzers.
The drawbacks have generally involved the optical characteristics, dimensional tolerances and handling requirements of the integrally formed cuvette belts.
Brief Description of the Invention The cuvette system of the present invention overcomes the drawbacks found with known integrally formed cuvette belts by providing a practical, simplified desi~,n that is relatively inexpensive to manufacture to exacting optical tolerances and which is easily transported and aligned witnin the analyzer.
The cuvette belt of the present invention comprises a matching pair of elongated webs which are joined together along corresponding faces thereof to form an integral belt. A series of regularly spaced chamber halves are formed laterally in each of the corresponding web faces which define open top cuvette receptacles when the web halves are joined.
An indexing means is also disclosed for aligning the optical portion of the chamber halves when the webs are joined together, thereby defining a precise optical path through the cuvette. This indexing means may further serve to align the cuvette optical path with respect to the optical examining mechanism of the instrument as the cuvette belt is transported therethrough.
The two-piece structure of the present invention also perrnits novel manufacturing techniques to be employed which greatly simplify the production process and reduce the overall cost of the cuvette system. Such production advantages are achieved through the use of low cost thin plastic sheet stock material, with no resulting loss in optical precision or dimensional accuracy inthe cuvette. In fact, it has been founcl that cuvettes may be produc,~ed in accordance with the present invention that possess optical characteristics and dimensional accuracy heretofore obtainable only through use of injection molding techniques.
Therefore, an inexpensive disposable cuvette belt may be produced in accordance with the present invention which meets in all respects the precision optical requirements of modern chemical analyzers. The individual cuvettes of the present invention provide a precisely defined optical path through the ~cuvette that is extremely transparent at the wave leng,~s u tilized in such analyzers and which avoids any significant birefringence of the light beam passing therethrough.
In addition, such cuvettes may be easily manufactured with an elongated shape of srnall cross sectional area which is particularly suited for testing micro sample sizes of biological fluids.
Furthermore, the indexing means of cuvette belts designed in accordance with the present invention permits the precise and repeatable positioning of thecuvette optical path with respect to the optical system of the analyzer. Hence, a simplified transport mechanism may be utilized in the analyzer which allows a limited number of optical stations to view a relatively large number of different cuvettes during the period of time that the cuvettes are passed through the analyzer. Accordingly, the cuvette belt desi~n of the present invention also permits an overall reduction in the complexity and cost of the automated chemical analyzer in which it is used.
Description of the Drawin~s Figure 1 is a partial top plan view of an elongated thin plastic sheet stock material which may be utilized to form an embodiment of the present invention;
(--Figure 2 is an end view oE the material sl~own in Figure l;
Figure 3 is a top plan view of the material shown in Figure 1 I-aving chambers formed thereon in accord2nce with an embodiment oI the present invention;
Figure 4 is an end view of the ~ormed material shown in Figure 3;
Fi~ure 5 is a partlal side view of a cuvette belt formed in accordance with an embodiment of the present invention;
Figure 6 is an end view of the cuvette belt shown in Figure 5;
Figure 7 is a perspective view of a portion oE the cuvette belt shown in Figure 5;
Figure 8 is an enlarged side view of a portion of the cuvette belt shown in Figure 5;
!
Figure 9 is a sectional top view of the cuvette belt shown in Figure 8 taken along line 9-9 thereof~; and Figure 10 is a sectional end view of the cuvette belt shown in Figure 8 taken along the line 10-10 thereof.
Description of the Preferred Embodiment Figures 1 through 4 of the drawings illustrate the forming steps of a method by which a cuvette belt constructed in accordance with an embodiment of the present invention may be produced. This assembled cuvette belt 10 is illustrated in detail in Figures 5 through 10 of the drawings. 7 ?~
~ow~
As shown in Figures 1 and 2, cuvette belt 10 is forrned ~ a thin plastic .?~2 ^ ~/' web of sheet stock material 20 which is cut into elongated strips prior to the ~'~
~ ~0 ~/' ~3;~
formin~ operation. ~hese s-trips should be oE su~icient length to provicle a roll of cuvet-tes aEter forming as required ~or the continuous operation oE the analyzing instrwnent. It has been found that copolyester or vinyl plas-tic sheet s-tock in thickness of .003 to .010 inch provide satisfactory optical results when formed according to the present invention. An example of such a material is KODAR* brand thermoplastic poly-ester resin material manufactured by Eastman Kodak Co. In addition, in order to acilitate the fabrication and assembly of the cuvette belt, this sheet stock may be a laminate, hav-ing a layer of an easily sealable and biologically inert mat-erial such as SURLYN* brand ionomer resin material manufactured by E.I. Dupont DeNemours & Co., Inc.
Figures 3 and 4 illustrate sheet stock material2 having a series of regularly spaced chambers 12 formed laterally across its surface. In the preferred embodiment, these chambers are formed as narrow, shallow indentations having a generally rectangular shape. Since chambers 12 are shallow indentations, it is possible to form them utilizing cold molding techniques, thereby avoiding any optical degradation of the material due to heat. In addition, an optical portion 22 of the material may be restrained by clamping or other molding techniques during the chamber forming operation to avoid stretching or other deformation of it which would be detrimental to its optical performance. In this manner, essentially all stretch-ing of the material during the forming process is limi-ted to side walls 14 of the chamoers, and op-tical portions 22 there-of are maintained stress-free and with a uniform thic~ness.
A further advantaqe of the present invention is that a series of inde~ing perfora-tions30 may be formed a-long opposite longitudinal edges 21 of web material 20 during the chamber-forming operatlon. These edges of web ma~ also *Trademark ~`~ rlt ~ clampe~ durincl the onmincJ process so as to insure that a precis~ re-lationship is n~intained between inde~ing per~orations 30 and the cuvette opti~al window 2~1 utilizecl by the analyzing instrument. In the pre-~err~d ~n ~ diment, these optical windows 24 c~re located at opposite ends of ch~mber 1~ adjacent to indexin~ perforations 30 in order to insure tha-t precise ali3llmelltof them is repea-tably maintained durinct tr~nsport of the cuvette belt throucJh -the instrlment.
~ fter chamb~r 12 and indexinc3 perforations 30 are fonmed, web 20 is longi~ in~lly slit along its center line A-~. In this nanner t~o corresponding web halves 26, 27 are obtained which are identical in their configuration. Indexing perforations 30 are then u~ to precisely alicJn the ~eb halves with respec-t to each other as illustrated in Fic~ures S and 6, so that optical windows 24 will form a precise optical pa-th through the resulting cuvette or receptical 16 when web halves 26, 27 are joined along their corre~nn~;ng faces. The slitting step may beperfor~ed either before or aEter the web halves are joined.
As is best shown in Figure 7, whe~ joined toc~ether the ~h~mhPr hk-lves formed in ~eb halves 26. 27 will define receptacles 16 having an open top 17 adapted to receive and retain fluid sample ~not sho~m). The bcdy of these receptacles is elongated along central axis B-B extending through thier open tops. It has been found that web halves 26, 27 may be joined together about their periphery by a low heat sealin~ process if a laminate material havina a lo~ melting point layer such as SU~LY~I is u~;li7.e~,or by impulse bonding techniques if higher melting point materials are u~;l;7e~. Its is also possible to choose other joining methods, such as adhesive knn~;ng, as long as the optical characteristics and dimensional tolerances of the cuvettes are not adversely affected thereby.
In the particular embodument of the cuvette belt 10 shown in Figure 8 through 10, receptacles 16 are s~bstantially rectangular in cross section. Optical portions 22 oE the chamb~r halves 14 are opposite parallel ~alls of the rectangular receptacles, thereby providing on op-tical path of precise length through the cuvette.
As ~;c~cs~ above, after the cuvette belt is formedr indexing p~rfor~ n~ 30 may be u~ P~ as a means Eor aligning the optical pa~h through receptacles 16 with respect to the optical examinin~ system of the instrument (not shown). F~thermore, the spatial relationship 3bet~een indeYing perforations 30 and optical windows 24 will ]be precisely main-tained even though the cuve-tte ]belt is laterally fleYed or twisted about its longitu~;n~l edge 12 as transported from station to station in the instrument. In this connection, it is important that -the transport area 28 along longitudinal edge 21 not permitveLtical fleYing of the cuvette belt which could interfer with maintaining the proper vertical aligment of the cuvettes in the instrun ~ t.
/rl~
Although a specific embodiment of the present invention has been 7 ~ c described above and shown in the drawings, it is to be understoocl tl~t obvious ~-variations and modifications thereof falling within the scope and spirit of the present invention may be made as required by those skilled in the art. It is therefore intended that the following claims be construed as including such variations and mo~ifications of the present invention.
Claims (24)
PROPERTY OR PRIVILEGE IS CLAIMED ARE DEFINED AS FOLLOWS:
1. A flexible cuvette belt for transporting fluid samples through an instrument having an optical means for examining the fluid samples while disposed within the cuvettes, said cuvette belt comprising:
a pair of elongated webs joined together along corresponding faces thereof to form an integral belt;
a series of regularly spaced chamber halves formed laterally in said corresponding web faces, said chamber halves defining open top receptacles for receiving and retaining the fluid samples, and having an optical portion therein which forms an optical path therethrough;
and indexing means in the form of a series of perforations which are formed in said webs along the web longitudinal edge opposite the open tops of said receptacles and which are precisely aligned in relation to the optical portions of said chamber halves, said indexing means serving to align the optical portions of said chamber halves when said webs are joined together and to align the optical path through each receptacle with respect to the optical examining means of the instrument.
a pair of elongated webs joined together along corresponding faces thereof to form an integral belt;
a series of regularly spaced chamber halves formed laterally in said corresponding web faces, said chamber halves defining open top receptacles for receiving and retaining the fluid samples, and having an optical portion therein which forms an optical path therethrough;
and indexing means in the form of a series of perforations which are formed in said webs along the web longitudinal edge opposite the open tops of said receptacles and which are precisely aligned in relation to the optical portions of said chamber halves, said indexing means serving to align the optical portions of said chamber halves when said webs are joined together and to align the optical path through each receptacle with respect to the optical examining means of the instrument.
2. The cuvette belt of Claim 1 wherein said chamber halves are formed adjacent to the other longitudinal edge of said webs.
3. The cuvette belt of Claim 2 wherein the open tops of said receptacles are located along said other web longitudinal edge.
4. The cuvette belt of Claim 3 wherein the central axis of said receptacles extending through their open tops is perpendicular to said other web longitudinal edge.
5. The cuvette belt of Claim 4 wherein said receptacles are elongated along said central axes.
6. The cuvette belt of Claim 5 wherein said chamber halves are relatively shallow in relation to the length of said receptacles.
7. The cuvette belt of Claim 1 wherein the optical portions of said chamber halves are located at the bottom of said receptacle away from its open top.
8. The cuvette belt of Claim 1 wherein said integral belt is supported along said perforated web longitudinal edge as it is transported through the instrument.
9. The cuvette belt of Claim 1 wherein said receptacles are substantially rectangular in cross section.
10. The cuvette belt of claim 9 wherein the optical portions of said chamber halves are opposite parallel walls of said rectangular receptacles.
11. The cuvette belt of Claim 1 wherein said webs are formed as mirror images of each other.
12. The cuvette belt of Claim 1 wherein said webs are formed identically to each other.
13. The cuvette belt of Claim 1 wherein said webs are made of thin plastic sheet stock.
14. The cuvette belt of Claim 13 wherein said plastic sheet stock is optically transparent at the wave length utilized by the instrument optical means.
15. The cuvette belt of Claims 13 or 14 wherein said plastic sheet stock may be cold formed.
16. The cuvette belt of Claim 13 or 14 wherein said plastic sheet stock may be cold formed and is a laminate, the inner surface of which facilitates the joining together of said webs.
17. A flexible cuvette belt comprising a composite of two flexible webs wherein each web of such composite is the mirror image of the other, said belt having a plurality of integrally formed cuvettes disposed at regularly spaced intervals along its length, and indexing means integral within said web for precise and repeatable positioning of an optical pathway through said cuvette relative to a photooptical system of an analytical instrument, said cuvettes comprising an elongated, essentially rectangular, chamber having an open top end and a sealed bottom end, said elongated chamber further defined by at least two pair of opposing longitudinal side walls, one such pair of opposing longitudinal sidewalls being co-planar with said web and providing a pair of optical windows in the optical pathway through said cuvette, said sidewalls which form said optical windows being relatively stress free and of uniform thickness.
18. A method of constructing a flexible cuvette belt having receptacles therein for retaining and trans-porting fluid samples through an instrument having an optical means for examining the fluid samples disposed in the receptacles, said method comprising:
forming a series of regularly spaced chambers laterally across the center of an elongated web of plastic sheet stock;
restraining a portion of each chamber so that it does not stretch or otherwise deform when said chambers are formed, thereby preserving the optical uniformity of said portion;
slitting said elongated web longitudinally along its center to thereby slit said chambers into chamber halves in each web half; and joining said web halves together so that said chamber halves form said receptacles.
forming a series of regularly spaced chambers laterally across the center of an elongated web of plastic sheet stock;
restraining a portion of each chamber so that it does not stretch or otherwise deform when said chambers are formed, thereby preserving the optical uniformity of said portion;
slitting said elongated web longitudinally along its center to thereby slit said chambers into chamber halves in each web half; and joining said web halves together so that said chamber halves form said receptacles.
19. The method according to Claim 18 wherein said chamber halves are clamped at opposite corresponding portions thereof so that an optical path through each receptacle is created when said web halves are joined.
20. The method according to Claim 19 wherein said chambers are formed by a cold forming process.
21. The method according to Claim 20 wherein said chambers are formed as shallow indentations in said web.
22. The method according to Claim 21 wherein said chambers are formed as narrow indentations extending laterally across said web.
23. The method according to Claim 19 further comprising forming corresponding indexing perforations along the opposite longitudinal edges of said web which are positioned in precise relationship to said chamber optical portions.
24. The method according to Claim 23 further comprising aligning said indexing perforations as said web halves are joined, thereby forming a precise optical path through said resulting receptacle.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US28484281A | 1981-07-20 | 1981-07-20 | |
| US284,842 | 1981-07-20 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1192421A true CA1192421A (en) | 1985-08-27 |
Family
ID=23091735
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000407619A Expired CA1192421A (en) | 1981-07-20 | 1982-07-20 | Cuvette system for automated chemical analyzer |
Country Status (7)
| Country | Link |
|---|---|
| US (1) | US4528159A (en) |
| EP (1) | EP0085700A4 (en) |
| JP (1) | JPS58501142A (en) |
| AU (1) | AU553772B2 (en) |
| CA (1) | CA1192421A (en) |
| ES (2) | ES275136Y (en) |
| WO (1) | WO1983000296A1 (en) |
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1982
- 1982-07-19 WO PCT/US1982/000978 patent/WO1983000296A1/en not_active Application Discontinuation
- 1982-07-19 ES ES1982275136U patent/ES275136Y/en not_active Expired
- 1982-07-19 AU AU88233/82A patent/AU553772B2/en not_active Ceased
- 1982-07-19 EP EP19820902589 patent/EP0085700A4/en not_active Withdrawn
- 1982-07-19 JP JP57502548A patent/JPS58501142A/en active Pending
- 1982-07-20 US US06/400,191 patent/US4528159A/en not_active Expired - Lifetime
- 1982-07-20 CA CA000407619A patent/CA1192421A/en not_active Expired
-
1983
- 1983-03-16 ES ES520655A patent/ES8407416A1/en not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| EP0085700A1 (en) | 1983-08-17 |
| AU553772B2 (en) | 1986-07-24 |
| WO1983000296A1 (en) | 1983-02-03 |
| ES520655A0 (en) | 1984-09-16 |
| ES275136Y (en) | 1984-10-01 |
| EP0085700A4 (en) | 1985-10-14 |
| ES275136U (en) | 1984-02-01 |
| AU8823382A (en) | 1983-03-17 |
| JPS58501142A (en) | 1983-07-14 |
| US4528159A (en) | 1985-07-09 |
| ES8407416A1 (en) | 1984-09-16 |
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| Date | Code | Title | Description |
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| MKEX | Expiry |