CA1304659C - Suction head for carrying reaction cups used in biochemical reaction analyzing apparatus - Google Patents
Suction head for carrying reaction cups used in biochemical reaction analyzing apparatusInfo
- Publication number
- CA1304659C CA1304659C CA000544174A CA544174A CA1304659C CA 1304659 C CA1304659 C CA 1304659C CA 000544174 A CA000544174 A CA 000544174A CA 544174 A CA544174 A CA 544174A CA 1304659 C CA1304659 C CA 1304659C
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- Canada
- Prior art keywords
- reaction
- cup
- suction
- cylindrical cavity
- suction head
- Prior art date
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Abstract
ABSTRACT
A suction head for carrying reaction cups, which can carry a reaction cup of light weight used for any biochemical reaction analysis by hanging it by suction, wherein the head is provided with a cylindrical cavity as an air passage having a diameter approximately equal to that of an air suction and discharge opening formed at the lower end of the head body and extending up from the opening in the head body; further, if necessary, a plurality of circumferential grooves formed in the inner wall surrounding the cylindrical cavity as required; or a vertically movable weight fitted in the cylindrical cavity.
A suction head for carrying reaction cups, which can carry a reaction cup of light weight used for any biochemical reaction analysis by hanging it by suction, wherein the head is provided with a cylindrical cavity as an air passage having a diameter approximately equal to that of an air suction and discharge opening formed at the lower end of the head body and extending up from the opening in the head body; further, if necessary, a plurality of circumferential grooves formed in the inner wall surrounding the cylindrical cavity as required; or a vertically movable weight fitted in the cylindrical cavity.
Description
~3~
DESC~IPTION
SUCTION HEAD FOR CARRYING REACTION CUPS USED
IN BIOCHE~ICAL REACTION ANALYZING APPARATUS
Technical Field:
The present invention relates to a suction head for carrying reaction cups to be used suitably in, for example, an analyzing apparatus for detection and measurement oE a very small amount of biologically active substances contained in specimen solution, particularly EIA (Enzyme Immuno Assay) apparatus.
Background Art:
The present invention will be described below by referring to its typical application, Enzyme Immuno Assay method, wherein enzyme is used as a label for an antigen-antibody reaction complex. Recently, active efforts have been made in the research and development of the EIA method, as one of immunological techniques for detecting and measuring very small amounts of biologically active substances.
There are many types of EIA methods. A method is known typically wherein an amount of antibody or antigen in specimen solution is quantitatively analyzed by contacting the solution with antigen or antibody fixed on an insoluble carrier and a conjugate labeled with enzyme as to produce complex through the reaction of ~L3~
immune reaction, contactiny the produced complex with substra-te which can produce opticall~ detectable variation in its characteristics (for example, fluorescen-t intensity) under the activating action of the enzyme, and determining the optical variation of the substrate.
Since these analytical operations were generally performed on many specimens, analyzing apparatuses comprising a number of reaction cells such as the known micro-titre plate has been conven-tionally provided for practical use.
~owever, these operations by using micro-titre plate present inconvenience that they require time-consuming preparation for the analyzing process, if assays of different analytes are applied to individual samples, though they are effectively appropriate to assay of the same analyte or the same group of analytes for each specimen.
In these circumstances, the inventors have completed such a system as described below to improve the operability and the efficiency of operation in the practical applications of the EIA method.
In accordance with a particular embodiment of the invention there is provided a biochemical reaction analyzing apparatus having a reaction cup and a suction head for carrying said reaction cup, wherein said cup has a hollowed portion providing a reaction cell for biochemical reactions and a top face covered and sealed with a sheet, said suction head being engageable with the sealed top face of the cup, said suction head comprising: an annular elastic suction pad at its lower end which engages with the top face of the cup to engage with the periphery of the top face of the cup, and a head body `B
.
5g provided wi-th an air suc-tion and discharge opening formed inside said suction pad, said head body defin-ing a cylindrical cavity at its lower end and an air passage at its upper end, said cylindrical cavity having a diameter which is substantially equal to a diameter of said opening, said air passage ha-ving a diameter which is smaller than the diameters of said cylindrical cavity and said opening, said cylindrical cavity extending up from said opening in a vertical direction and having a length in the vertical direction sufficient to permit a stream of discharged air from said air passage to be guided downward onto the reaction cup through an entire cross-sectional area of said opening.
This system is used with sealed cups, filled with a specific antibody (or antigen) fixed on an insoluble carrier (for example, bead) and conjugate (this cup will be referred to as "reaction cup" hereinafter). A group of reaction cups is prepared for each analyte. Before the analyzing operations are undertaken, this system can select the reaction cups corresponding to - 2a -, ' 1~04~5~
the required analytes for each specimen from among the prepared groups of reaction cups, and carry them on a transport block and then transport to an analyzing section.
Such a system is characterized by the fact that it can be very effectively used for an automated analyzing apparatus. For example, if the system comprises a cup lifter of x/y scanning type in a storage containing a group of reaction cups corresponding to each of many analytes and can repeat the sequential operations of hanging a specific reaction cup and carrying it onto the transport block by running the cup lifter over the storage, the use of an electronic control unit will allow the cup lifter to arrange the reaction cups far the respective analytes automatically and mechanically on the transport block followed to the required data stored in the control unit.
A suction head, for example, as shown in Fig. 4, can be used as a part of the cup lifter for the system as described above. However, the use of this suct1on head in the:system encountered the problems as described below.
The suction head as shown in Fig. 4 comprises a head body ll, a suction pad 12 of elastic ring fixed on the lower end of the head body 11, and an air passage 13 provlded with an air suction port 14 opened at the central bottom part of the elastic pad 12 and another port 15 connected to a pressure reducing source 17 1304~5g through a change-over valve 16. This suction head attracts the reaction cup as described above at the lower end of the suc-tion pad 12 by the aid of vacuum, and hangs it by suction. Although there was no problem in suction hanging of the reaction cup, the suction pad encountered a problem that the reaction cup 19, very light, is hardly separated from the suction pad 12 because of its adhesion when it is placed down on the transport block. As shown in Fig. 5, the change-over valve 16 was switchably connected between the pressure reducing source 17 and a pressure source 18, which permits to discharge air through the suction port 14 for the forced separation of the cup 19 from the suction pad 12. However, this configuration as shown in Fig. 5 sometimes caused a difficulty in the separation of the cup 19 from the suction pad 12.
The present invention was produced to provide a device effectively applicable to the system using reaction cups as described above. Particularly, an objective of the present invention is to provide a suction head which can be used to seIect and carry the reaction cup, as used 1n the above-described system, in a storage of many reaction cups, particularly a suction head which can provide the stable operations of lifting up and placing down the reaction cup.
Disclosure of Inventlon:
AcGording to the present invention produced '~
~3~465g to accomplish this object, the suction head for carrying reaction cups used in a biochemical reaction analyzing apparatus is characterized by the facts that it can engage with the sealed-up top face of a reaction cup, which comprises a hollow body constituting a reaction cell for biochemical reaction as well as a top covered and sealed up with a sheet, and carry the reaction cup by hanging it by suction, and it comprises a suction pad of elastic ring at its lower end to engage with the periphery of the reaction cup top face, a head body provided with an air suction and discharge opening formed inside the suction pad, and a cylindrical cavity approximately equal in diameter to the opening and extending up from the opening in the axial direction of the head body enough long to guide the discharged air stream downward.
In the suction head thus constructed, the head body provided with the cylindrical cavity may be provided with a plurality of circumferential grooves in its inner wall. It is also effective that a weight of light load engageable with the top of the reaction cup freely moves vertically in the cylindrical cavlty or passage so as to exert a mechanical downward force on the reaction cup to be placed down in position. It is also effective to exert a downward force on the weight by using a spring of small load.
The present invention utilizes this construction of the suction head for the reason as described below.
~304~9 The inventors found that in the construction as shown in Fig. 5, if the suction of the reaction cup by the suction pad is caused by the horn type air suction and discharge port of the head body, the discharge air tends to suck the reaction cup up to the suc-tion pad according to the Bernoulli's principle. Based upon this knowledge, the inventors invented the construction of the suction head according -to the present invention wherein the effec-t of suction given by the discharge air on the reaction cup was eliminated.
For the EIA process, the present invention uses a reaction cup in preference which is filled up with a specific antibody (or antigen) fixed on the surfaces of synthetic resin beads as material contributing to the immunological reaction. However, the reaction cup may not be limited to such a cup.
In many cases, the reaction cup is a cup of transparent or opaque synthetic resin having a capacity as small as several milliliters or less and a weight of approximately lOg or less.
The sealing sheet over the top of the reaction cup is a foil that is so fragile as to be easily broken by a sharp tool or equivalent, or general~ly a metallic foil such as aluminium or a plastic film coated with aluminium. However, the material of the sealing sheet is not limited to them. The sealing foil must be tightly attached by the heat~sealing or the bonding onto the periphery of the top opening.
130~5g Brief Description of Drawings:
Fig. l(a) is a fron-t view illustrating the construction of an embodiment of suction head according to the present invention.
Fig. l(b) is a partial enlarged view with a sectional view in the right half part showing the detail of the suction head as shown in Fig. l(a).
Figs. 2(a) to 2(c) are partial enlarged views with sectional views in the right half parts showing the other embodiments of suction head according to the present invention.
Fig. 3 is a perspective illustrating the construction of the reaction cup according to the present invention.
Fig. 4(a) is a frontal view showing a conventional suction head.
FigO 4(b)~is a partlal enlarged view with a sectional view in the right half part showing the detail of the suction head as shown in Fig. 4(a).
Flg. 5 is a frontal view showing another conventional suction head.
Best Mode for Carrylng Out the Invention:
The present invention will be described below by using the embodiments as shown in the drawlngs anne~ed hereto.
In Fig. 1, the head body 1 of the suction head is supported by a movable support (not shown) 50 that 1304~S9 it can be moved in a horizontal plane. This movable support is generally controlled by a proper electronic control unit so that it can be horizontally and vertically moved to scan, lift and lower the reaction cup.
At the lower end o~ the head body 1, a suction pad of elastic ring 2 is fixedly mounted so that the lower end of the pad 2 can engage with the top of the reaction cup 19.
An air passage 3 is provided with an air suction and discharge port 4 formed as a larger opening at the lower end of the head body 1 (inside the suction pad 2).
The other end 5 of the air passage 3 is switchably connected to a pressure reduclng source 7 and a pressure source 8 through a change-over valve 6.
This embodiment of suction head according to the present invention is characterized by the fact that a cylindrical cavity 4a having the same diameter as the air suction and~discharge port 4 is formed up from the air suctlon and discharge port 4 (in the axial dlrectlon of the head body) at the predetermlned length. A ~
plurality of circumferential grooves~4b are formed in the inner wall surrounding the cylindrlcal cavlty~4a.
The cylindrical cavity 4a constitutlng a part of the air passage 3 is effective to separate the reaction cup 19 forcedly from the suction pad 2 by the aid of the~air discharge pressure, when the reaction cup 19 is placed down on a transport block. To elimlnate the effect of suction according to the Bernoulli's principle .
as described above, it is desirable tha-t the area on the top face of the sealing sheet over the reaction cup where the discharged air is blown down is as large as possible, that the area on the top face of the sealing sheet where the air flows in parallel to the top face of the sheet is thus as small as possible, and that the diameter of the former area is set according to the conditions where the reaction cup can be separated from the suction pad. In general, the diameter of the air-blown area is desirably 50% to 90% of the suction pad inner diameter.
It is also deslrable that the axial length of the cylindrical cavity 4a is set so as to meet the conditions in which the air discharged through the narrow air passage 3 is blown down on the reaction cup through the entire cross sectional area of the discharge port 4.
In general, the axial length of the cylindrical cavity 4a is desirably equal to or greater than 1/2 the diameter of the discharge port 4.
The air suction force and the air discharge force used for the lifting of the reaction cup by the suction head according to this embodiment is generally approximately -0.9 atom to -0.2 atom and approximately 0.1 atom to 2 atom respectively.
The reaction cup lifting test was conducted by uslng this embodiment of suction head according to the present invention in the conditions as described below, and the results were compared with the results g _ l3a~ss of the same -test on the suction head as shown in Fig. 5 (substantially identical with the suction head according to this embodiment, except that it has no cylindrical cavity). The comparison showed that the working stability was higher for this embodiment, as indicated in Table 1.
The embodiment according to the present invention:
Reaction cup Top diameter of aluminium foil seal: 14 mm~
Bottom diameter of cup : 10 mm~
Weight : 1 g Suction head:
Air passage Diameter : 2 mm~
Air suction pressure : -0.5 atom Air discharge pressure: 0.5 atom Cylindrical cavity Diameter : 5 mm~
Axial length : 20 mm Peripheral grooves: 1 mm (3 grooves) Suction pad (of rubber) Inner diameter : 8 mm~
Outer diameter : 14 mm~
The length of the projection from the lower end of the head body : 0.5 mm ~3~ 65.~
Table 1 Of 100 reaction cups moved from the storage into a transport block, the number of reaction cups failed in movement Conventional suction head 1 to 10 or (Fig. 5) more This embodiment (Fig. 1) 1 or less The present invention is not limited to the embodiment as described above. As it is shown in Figs. 2(a) to 2(c), a vertically movable weight may be freely moved in the cylindrical cavity 4a in the head body 1 and engaged with the top face of the reaction cup to facilitate the separation of the reaction cup from the suction pad 2. 4c is a stopper flange part whlch projects at the lower end of the head body in the radial and inward direction of the cylindrical cavity 4a to prevent the weight from slipping off.
Fig. 2(a) shows an embodiment using a pin type weight 9a~. Flg. 2(b) shows an embodiment using a ball type welght 9b. Fig. 2(c) shows an embodiment using a pin type weight 9a combined with an energizing spring 10 whlch exerts a sprlng force~down on the weight 9a. The weight may be;of steel, for example, and approximateIy 0.5 g in weight. The material and weight are not limited. If the energizing spring 10 is used, :~
, ~- .
~3U4~S9 it is desirable that the spring force is not grea-ter than 1/2 the suction force exerted by the suction pad 2 on the reaction cup 19. The weight 9a and the stopper flange part 4c are so precisely worked that they can engage with each other so tightly to cause little air leakage.
In these embodiments as shown in Figs. 2(a) to 2(c3, the reaction cup 19 can be effectively separated from the suction pad 2 with energing spring when it is placed down on a transport block, as in the embodiment as shown in Fig. 1. In addition, these embodiments present the advantages that the forced separation of the reaction cup can assure a larger range of air discharge pressures than that in the embodiment as shown in Fig. 1, because the air discharge may be enough small, and the pressed-down weight can prevent the air from flowing further and consequently the reaction cup and other parts near the suction head from being blown away.
~ The suction head as shown in Fig. 2(c) was tested in;the same conditions as the dev1ce as shown in Fig. 1, and the results were compared with those of the suction head as shown in Fig. 5. The comparison revealed~that the working stability was remarkably higher for the embodiment as shown in Fig. 2(c), as shown in Table 2.
.
. .
. , ~ . .
~L3~4~9 Table 2 0~ lOO reaction cups moved from the storage to a transport block, the number of reaction cups failed in movemen-t Conventional suction head l to lO or (Fig. 5) more _ This embodiment (Fig. 2(c)~
Industrial Applicability:
The suction head according to the present invention presents the advantages that it can be effectively used to carry reaction cups selectively in a storage of many }eaction cups in a system using reaction cups, and that:it can assure a stable operation of lifting a reaction cup.
:
:
:
- 13 _ : '
DESC~IPTION
SUCTION HEAD FOR CARRYING REACTION CUPS USED
IN BIOCHE~ICAL REACTION ANALYZING APPARATUS
Technical Field:
The present invention relates to a suction head for carrying reaction cups to be used suitably in, for example, an analyzing apparatus for detection and measurement oE a very small amount of biologically active substances contained in specimen solution, particularly EIA (Enzyme Immuno Assay) apparatus.
Background Art:
The present invention will be described below by referring to its typical application, Enzyme Immuno Assay method, wherein enzyme is used as a label for an antigen-antibody reaction complex. Recently, active efforts have been made in the research and development of the EIA method, as one of immunological techniques for detecting and measuring very small amounts of biologically active substances.
There are many types of EIA methods. A method is known typically wherein an amount of antibody or antigen in specimen solution is quantitatively analyzed by contacting the solution with antigen or antibody fixed on an insoluble carrier and a conjugate labeled with enzyme as to produce complex through the reaction of ~L3~
immune reaction, contactiny the produced complex with substra-te which can produce opticall~ detectable variation in its characteristics (for example, fluorescen-t intensity) under the activating action of the enzyme, and determining the optical variation of the substrate.
Since these analytical operations were generally performed on many specimens, analyzing apparatuses comprising a number of reaction cells such as the known micro-titre plate has been conven-tionally provided for practical use.
~owever, these operations by using micro-titre plate present inconvenience that they require time-consuming preparation for the analyzing process, if assays of different analytes are applied to individual samples, though they are effectively appropriate to assay of the same analyte or the same group of analytes for each specimen.
In these circumstances, the inventors have completed such a system as described below to improve the operability and the efficiency of operation in the practical applications of the EIA method.
In accordance with a particular embodiment of the invention there is provided a biochemical reaction analyzing apparatus having a reaction cup and a suction head for carrying said reaction cup, wherein said cup has a hollowed portion providing a reaction cell for biochemical reactions and a top face covered and sealed with a sheet, said suction head being engageable with the sealed top face of the cup, said suction head comprising: an annular elastic suction pad at its lower end which engages with the top face of the cup to engage with the periphery of the top face of the cup, and a head body `B
.
5g provided wi-th an air suc-tion and discharge opening formed inside said suction pad, said head body defin-ing a cylindrical cavity at its lower end and an air passage at its upper end, said cylindrical cavity having a diameter which is substantially equal to a diameter of said opening, said air passage ha-ving a diameter which is smaller than the diameters of said cylindrical cavity and said opening, said cylindrical cavity extending up from said opening in a vertical direction and having a length in the vertical direction sufficient to permit a stream of discharged air from said air passage to be guided downward onto the reaction cup through an entire cross-sectional area of said opening.
This system is used with sealed cups, filled with a specific antibody (or antigen) fixed on an insoluble carrier (for example, bead) and conjugate (this cup will be referred to as "reaction cup" hereinafter). A group of reaction cups is prepared for each analyte. Before the analyzing operations are undertaken, this system can select the reaction cups corresponding to - 2a -, ' 1~04~5~
the required analytes for each specimen from among the prepared groups of reaction cups, and carry them on a transport block and then transport to an analyzing section.
Such a system is characterized by the fact that it can be very effectively used for an automated analyzing apparatus. For example, if the system comprises a cup lifter of x/y scanning type in a storage containing a group of reaction cups corresponding to each of many analytes and can repeat the sequential operations of hanging a specific reaction cup and carrying it onto the transport block by running the cup lifter over the storage, the use of an electronic control unit will allow the cup lifter to arrange the reaction cups far the respective analytes automatically and mechanically on the transport block followed to the required data stored in the control unit.
A suction head, for example, as shown in Fig. 4, can be used as a part of the cup lifter for the system as described above. However, the use of this suct1on head in the:system encountered the problems as described below.
The suction head as shown in Fig. 4 comprises a head body ll, a suction pad 12 of elastic ring fixed on the lower end of the head body 11, and an air passage 13 provlded with an air suction port 14 opened at the central bottom part of the elastic pad 12 and another port 15 connected to a pressure reducing source 17 1304~5g through a change-over valve 16. This suction head attracts the reaction cup as described above at the lower end of the suc-tion pad 12 by the aid of vacuum, and hangs it by suction. Although there was no problem in suction hanging of the reaction cup, the suction pad encountered a problem that the reaction cup 19, very light, is hardly separated from the suction pad 12 because of its adhesion when it is placed down on the transport block. As shown in Fig. 5, the change-over valve 16 was switchably connected between the pressure reducing source 17 and a pressure source 18, which permits to discharge air through the suction port 14 for the forced separation of the cup 19 from the suction pad 12. However, this configuration as shown in Fig. 5 sometimes caused a difficulty in the separation of the cup 19 from the suction pad 12.
The present invention was produced to provide a device effectively applicable to the system using reaction cups as described above. Particularly, an objective of the present invention is to provide a suction head which can be used to seIect and carry the reaction cup, as used 1n the above-described system, in a storage of many reaction cups, particularly a suction head which can provide the stable operations of lifting up and placing down the reaction cup.
Disclosure of Inventlon:
AcGording to the present invention produced '~
~3~465g to accomplish this object, the suction head for carrying reaction cups used in a biochemical reaction analyzing apparatus is characterized by the facts that it can engage with the sealed-up top face of a reaction cup, which comprises a hollow body constituting a reaction cell for biochemical reaction as well as a top covered and sealed up with a sheet, and carry the reaction cup by hanging it by suction, and it comprises a suction pad of elastic ring at its lower end to engage with the periphery of the reaction cup top face, a head body provided with an air suction and discharge opening formed inside the suction pad, and a cylindrical cavity approximately equal in diameter to the opening and extending up from the opening in the axial direction of the head body enough long to guide the discharged air stream downward.
In the suction head thus constructed, the head body provided with the cylindrical cavity may be provided with a plurality of circumferential grooves in its inner wall. It is also effective that a weight of light load engageable with the top of the reaction cup freely moves vertically in the cylindrical cavlty or passage so as to exert a mechanical downward force on the reaction cup to be placed down in position. It is also effective to exert a downward force on the weight by using a spring of small load.
The present invention utilizes this construction of the suction head for the reason as described below.
~304~9 The inventors found that in the construction as shown in Fig. 5, if the suction of the reaction cup by the suction pad is caused by the horn type air suction and discharge port of the head body, the discharge air tends to suck the reaction cup up to the suc-tion pad according to the Bernoulli's principle. Based upon this knowledge, the inventors invented the construction of the suction head according -to the present invention wherein the effec-t of suction given by the discharge air on the reaction cup was eliminated.
For the EIA process, the present invention uses a reaction cup in preference which is filled up with a specific antibody (or antigen) fixed on the surfaces of synthetic resin beads as material contributing to the immunological reaction. However, the reaction cup may not be limited to such a cup.
In many cases, the reaction cup is a cup of transparent or opaque synthetic resin having a capacity as small as several milliliters or less and a weight of approximately lOg or less.
The sealing sheet over the top of the reaction cup is a foil that is so fragile as to be easily broken by a sharp tool or equivalent, or general~ly a metallic foil such as aluminium or a plastic film coated with aluminium. However, the material of the sealing sheet is not limited to them. The sealing foil must be tightly attached by the heat~sealing or the bonding onto the periphery of the top opening.
130~5g Brief Description of Drawings:
Fig. l(a) is a fron-t view illustrating the construction of an embodiment of suction head according to the present invention.
Fig. l(b) is a partial enlarged view with a sectional view in the right half part showing the detail of the suction head as shown in Fig. l(a).
Figs. 2(a) to 2(c) are partial enlarged views with sectional views in the right half parts showing the other embodiments of suction head according to the present invention.
Fig. 3 is a perspective illustrating the construction of the reaction cup according to the present invention.
Fig. 4(a) is a frontal view showing a conventional suction head.
FigO 4(b)~is a partlal enlarged view with a sectional view in the right half part showing the detail of the suction head as shown in Fig. 4(a).
Flg. 5 is a frontal view showing another conventional suction head.
Best Mode for Carrylng Out the Invention:
The present invention will be described below by using the embodiments as shown in the drawlngs anne~ed hereto.
In Fig. 1, the head body 1 of the suction head is supported by a movable support (not shown) 50 that 1304~S9 it can be moved in a horizontal plane. This movable support is generally controlled by a proper electronic control unit so that it can be horizontally and vertically moved to scan, lift and lower the reaction cup.
At the lower end o~ the head body 1, a suction pad of elastic ring 2 is fixedly mounted so that the lower end of the pad 2 can engage with the top of the reaction cup 19.
An air passage 3 is provided with an air suction and discharge port 4 formed as a larger opening at the lower end of the head body 1 (inside the suction pad 2).
The other end 5 of the air passage 3 is switchably connected to a pressure reduclng source 7 and a pressure source 8 through a change-over valve 6.
This embodiment of suction head according to the present invention is characterized by the fact that a cylindrical cavity 4a having the same diameter as the air suction and~discharge port 4 is formed up from the air suctlon and discharge port 4 (in the axial dlrectlon of the head body) at the predetermlned length. A ~
plurality of circumferential grooves~4b are formed in the inner wall surrounding the cylindrlcal cavlty~4a.
The cylindrical cavity 4a constitutlng a part of the air passage 3 is effective to separate the reaction cup 19 forcedly from the suction pad 2 by the aid of the~air discharge pressure, when the reaction cup 19 is placed down on a transport block. To elimlnate the effect of suction according to the Bernoulli's principle .
as described above, it is desirable tha-t the area on the top face of the sealing sheet over the reaction cup where the discharged air is blown down is as large as possible, that the area on the top face of the sealing sheet where the air flows in parallel to the top face of the sheet is thus as small as possible, and that the diameter of the former area is set according to the conditions where the reaction cup can be separated from the suction pad. In general, the diameter of the air-blown area is desirably 50% to 90% of the suction pad inner diameter.
It is also deslrable that the axial length of the cylindrical cavity 4a is set so as to meet the conditions in which the air discharged through the narrow air passage 3 is blown down on the reaction cup through the entire cross sectional area of the discharge port 4.
In general, the axial length of the cylindrical cavity 4a is desirably equal to or greater than 1/2 the diameter of the discharge port 4.
The air suction force and the air discharge force used for the lifting of the reaction cup by the suction head according to this embodiment is generally approximately -0.9 atom to -0.2 atom and approximately 0.1 atom to 2 atom respectively.
The reaction cup lifting test was conducted by uslng this embodiment of suction head according to the present invention in the conditions as described below, and the results were compared with the results g _ l3a~ss of the same -test on the suction head as shown in Fig. 5 (substantially identical with the suction head according to this embodiment, except that it has no cylindrical cavity). The comparison showed that the working stability was higher for this embodiment, as indicated in Table 1.
The embodiment according to the present invention:
Reaction cup Top diameter of aluminium foil seal: 14 mm~
Bottom diameter of cup : 10 mm~
Weight : 1 g Suction head:
Air passage Diameter : 2 mm~
Air suction pressure : -0.5 atom Air discharge pressure: 0.5 atom Cylindrical cavity Diameter : 5 mm~
Axial length : 20 mm Peripheral grooves: 1 mm (3 grooves) Suction pad (of rubber) Inner diameter : 8 mm~
Outer diameter : 14 mm~
The length of the projection from the lower end of the head body : 0.5 mm ~3~ 65.~
Table 1 Of 100 reaction cups moved from the storage into a transport block, the number of reaction cups failed in movement Conventional suction head 1 to 10 or (Fig. 5) more This embodiment (Fig. 1) 1 or less The present invention is not limited to the embodiment as described above. As it is shown in Figs. 2(a) to 2(c), a vertically movable weight may be freely moved in the cylindrical cavity 4a in the head body 1 and engaged with the top face of the reaction cup to facilitate the separation of the reaction cup from the suction pad 2. 4c is a stopper flange part whlch projects at the lower end of the head body in the radial and inward direction of the cylindrical cavity 4a to prevent the weight from slipping off.
Fig. 2(a) shows an embodiment using a pin type weight 9a~. Flg. 2(b) shows an embodiment using a ball type welght 9b. Fig. 2(c) shows an embodiment using a pin type weight 9a combined with an energizing spring 10 whlch exerts a sprlng force~down on the weight 9a. The weight may be;of steel, for example, and approximateIy 0.5 g in weight. The material and weight are not limited. If the energizing spring 10 is used, :~
, ~- .
~3U4~S9 it is desirable that the spring force is not grea-ter than 1/2 the suction force exerted by the suction pad 2 on the reaction cup 19. The weight 9a and the stopper flange part 4c are so precisely worked that they can engage with each other so tightly to cause little air leakage.
In these embodiments as shown in Figs. 2(a) to 2(c3, the reaction cup 19 can be effectively separated from the suction pad 2 with energing spring when it is placed down on a transport block, as in the embodiment as shown in Fig. 1. In addition, these embodiments present the advantages that the forced separation of the reaction cup can assure a larger range of air discharge pressures than that in the embodiment as shown in Fig. 1, because the air discharge may be enough small, and the pressed-down weight can prevent the air from flowing further and consequently the reaction cup and other parts near the suction head from being blown away.
~ The suction head as shown in Fig. 2(c) was tested in;the same conditions as the dev1ce as shown in Fig. 1, and the results were compared with those of the suction head as shown in Fig. 5. The comparison revealed~that the working stability was remarkably higher for the embodiment as shown in Fig. 2(c), as shown in Table 2.
.
. .
. , ~ . .
~L3~4~9 Table 2 0~ lOO reaction cups moved from the storage to a transport block, the number of reaction cups failed in movemen-t Conventional suction head l to lO or (Fig. 5) more _ This embodiment (Fig. 2(c)~
Industrial Applicability:
The suction head according to the present invention presents the advantages that it can be effectively used to carry reaction cups selectively in a storage of many }eaction cups in a system using reaction cups, and that:it can assure a stable operation of lifting a reaction cup.
:
:
:
- 13 _ : '
Claims
1. A biochemical reaction analyzing apparatus having a reaction cup and a suction head for carrying said reaction cup, wherein said cup has a hollowed portion providing a reaction cell for biochemical reactions and a top face covered and sealed with a sheet, said suction head being engageable with the sealed top face of the cup, said suction head comprising: an annular elastic suction pad at its lower end which engages with the top face of the cup to engage with the periphery of the top face of the cup, and a head body provided with an air suction and discharge opening formed inside said suction pad, said head body defining a cylindrical cavity at its lower end and an air passage at its upper end, said cylindrical cavity having a diameter which is sub-stantially equal to a diameter of said opening, said air passage having a diameter which is smaller than the diameters of said cylindrical cavity and said opening, said cylindrical cavity extending up from said opening in a vertical direction and having a length in the vertical direction sufficient to permit a stream of discharged air from said air passage to be guided downward onto the reaction cup through an entire cross-sectional area of said opening.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA000544174A CA1304659C (en) | 1987-08-11 | 1987-08-11 | Suction head for carrying reaction cups used in biochemical reaction analyzing apparatus |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA000544174A CA1304659C (en) | 1987-08-11 | 1987-08-11 | Suction head for carrying reaction cups used in biochemical reaction analyzing apparatus |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1304659C true CA1304659C (en) | 1992-07-07 |
Family
ID=4136238
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000544174A Expired - Lifetime CA1304659C (en) | 1987-08-11 | 1987-08-11 | Suction head for carrying reaction cups used in biochemical reaction analyzing apparatus |
Country Status (1)
| Country | Link |
|---|---|
| CA (1) | CA1304659C (en) |
-
1987
- 1987-08-11 CA CA000544174A patent/CA1304659C/en not_active Expired - Lifetime
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| Date | Code | Title | Description |
|---|---|---|---|
| MKLA | Lapsed |