Note: Descriptions are shown in the official language in which they were submitted.
CA 02581073 2007-03-07
Transport System for Biosoecimens
This application is a divisional of Canadian Patent Application No. 2,216,052,
filed September 17, 1997, which claims priority from U.S. Patent Application
No. 08/715,772,
September 19, 1996.
FIELD OF THE INVENTION
The present invention relates to a transport system for transporting
biospecimens.
More specifically, the present invention relates to a transport system for
transporting individual
biospecimen containers with a conveyor.
BACKGROUND OF THE INVENTION
Biospecimens, such as blood or urine, are routinely obtained from patients and
brought to laboratory facilities for testing and analysis. In general, a
patient's biospecimen is
placed in a container, such as a test tube or vial, which is then sealed and
delivered to the testing
laboratory.
Typically, a lab technician at the testing laboratory will manually load these
containers, which can vary in their outside dimensions, into specimen
container racks, each rack
typically holding several containers which can be transported between various
locations in the
laboratory, as a group, via a conveyor. Individual biospecimens are identified
within the group
and generally within the laboratory by a bar code or other machine readable
indicia affixed to the
container. Usually, these indicia are attached to the container prior to or
when the specimen is
obtained from a patient, however they may be applied when containers are
received by the
technician in the laboratory. A laboratory information system, or other
suitable specimen
management means, is employed to also relate the indicia with the test or
tests to be performed
on the biospecimen.
Once the racks are loaded, they are placed on a conveyor and transported to
various stations within the laboratory, such as biospecimen test equipment
sites, etc.
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The above described prior art biospecimen transport systems have several
disadvantages. First, to accommodate containers of different sizes, the
container racks are
designed with container receptacles which are sized to receive the largest
contemplated
container. Containers of less than the largest size can therefore move within
their respective
container receptacles in the rack and this can result in the bar codes or
other identifying indicia
on the containers being obscured from a scanner reader by portions of the
rack. This can require
that the containers being removed from the rack each time access is required
to the indicia.
Another disadvantage is that several containers of biospecimens are
transported
along the conveyor as a group in the same rack. This grouped transport of
biospecimens can
decrease the efficiency of the transport system because transport of all of
the biospecimens in a
rack is delayed while any single container from the rack is tested, or
otherwise accessed, at any
location on the transport system. This delay is exacerbated if a particular
container contains a
biospecimen that must undergo a test that requires a relatively long period of
time to complete.
Attempts have been made to improve transport efficiency and/or reduce
transport
delays by having the lab technician sort the biospecimens and load
biospecimens to be tested
with similar tests into the same rack. However, this requires a substantial
time commitment on
the part of the technician to perform the sorting, increasing the expense of
operating the
laboratory.
SUMMARY OF THE INVENTION
It is an object of the present invention to provide a novel transport system
for
biospecimens which obviates or mitigates at least one disadvantage of the
prior art.
According to a first aspect of the present invention, there is provided a
transport
system for biospecimens, comprising:
a conveyor having a conveyor surface arranged in at least two transport lanes;
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CA 02581073 2007-03-07
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a specimen carrier to removably receive and transport a single biospecimen
container in
one of said two lanes, said carrier including means to inhibit tipping of said
biospecimen
container with respect to said conveyor interface.
According to another aspect of the present invention, there is provided a
specimen
carrier for transporting a biospecimen container on a conveyor, comprising:
a base member having a transport surface to engage the surface of a conveyor
and having
stabilization means to inhibit tipping of said container when on said
conveyor;
at least three retainer members rotatably mounted to said base member on a
side opposite
said transport surface to define a biospecimen container reception site
between said retainer
members, said retainer members being biased toward each other to receive and
maintain a
biospecimen container inserted therebetween at said reception site.
According to yet another aspect of the present invention, there is provided a
transport system for biospecimens, comprising:
a plurality of specimen carriers, each carrying a biospecimen container;
a conveyor divided into at least two transport lanes in which said plurality
of specimen
carriers may be transported;
a control station comprising at least one traffic control means to control
movement of
said plurality of specimen carriers in said transport system.
According to yet another aspect of the present invention, there is provided a
singulator to space specimen carriers on a conveyor in a transport system,
comprising:
a gate including a blocking portion and a specimen carrier engagement portion;
and
a drive means to rotate said gate to engage a specimen carrier upstream of
said gate on
said conveyor in said engagement portion and to rotate said gate to move said
engaged specimen
carrier to a position on said conveyor downstream of said gate wherein said
engaged specimen
carrier is released from said engagement portion for further movement on said
conveyor, said
blocking portion preventing specimen carriers upstream of said gate from
moving downstream.
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According to yet another aspect of the present invention, there is provided a
diverter to transfer specimen carriers between two lanes of a conveyor in a
transport system,
comprising:
an actuator arm including a cam surface; and
a drive means to rotate said actuator arm into or out of a first lane in said
conveyor from
which a specimen carrier is to be transferred, wherein said actuator arm is
rotated to abut a
specimen carrier in said first lane to direct said specimen carrier to a
second, adjacent lane in said
conveyor.
BRIEF DESCRIPTION OF THE DRAWINGS
Preferred embodiments of the present invention will now be described, by way
of
example only, with reference to the attached Figures, wherein:
Figure 1 shows a perspective view of a specimen carrier carrying a biospecimen
container in accordance with an embodiment of the present invention;
Figure 2 shows a perspective view, partially broken away, of a base member and
a
retainer member of the specimen carrier of Figure 1;
Figure 3A shows a cross-sectional view through the line 3-3 of Figure 1;
Figure 3B shows a cross-sectional view similar to that of Figure 3A wherein a
larger diameter biospecimen container is being carried;
Figure 4 shows a perspective view of a portion of a conveyor in accordance
with
the present invention and several specimen carriers thereon;
Figure 5 shows a section through line 5-5 of Figure 4;
Figure 6A shows a top view of a control station in accordance with an
embodiment of the present invention and several specimen carriers moving there
through;
Figure 6B shows a top view of the control station of Figure 6A at a later
point in
time;
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Figure 6C shows a top view of the control station of Figure 6B at a later
point in
time;
Figure 7 shows a perspective view of another control station in accordance
with
an embodiment of the present invention; and
Figure 8 shows a section taken along line 8-8 of Figure 7 and including a
barcode
scanner not shown in Figure 7.
DETAILED DESCRIPTION OF THE INVENTION
A specimen carrier in accordance with an embodiment of the present invention
is
indicated generally at 4 in Figure 1. Specimen carrier 4 is carrying a test
tube 6 with bar code 7
and is sealed by stopper 8. Presently in diagnostic medicine, the containers
used to hold
biospecimens vary in size and configuration, but the most common configuration
is a glass vial,
such as test tube 6, which is closed with a seal, such as stopper 8. However,
both the height and
the diameter of such containers do vary and diagnostic laboratories must deal
with a variety of
sizes of biospecimen containers.
Specimen carrier 4 comprises a base member 10, which has a generally
cylindrical shape, and three retainer members 12. Figure 2 shows a more
detailed view of base
member 10 and one of the three retainer members 12. Base member 10 has an
upper control
plate 20 and a lower base 21, the upper control plate 20 maintained in place
by a support 32 (best
seen in Figures 3A and 3B). Control plate 20 has three arcuate, generally
radial grooves 16A,
16B, 16C and three short notches 18A, 18B, and 18C. Base 21 has three sockets
14A, (14B and
14C are not shown) which are positioned under each of a corresponding one of
notches 18A,
18B, and 18C.
Each retainer member 12 has an upper end 22 and a lower end 24 and bends 26
and 28 which define an arm 29 therebetween. Each retainer member 12 is
installed in specimen
carrier 4 by positioning upper end 22 away from the center of base 21 and
inserting lower end 24
into socket 14, via notch 18. When lower end 24 is inserted into socket 14
sufficiently such that
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CA 02581073 2007-03-07
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arm 29 is below the lower surface of control plate 20, retainer 12 is rotated
to place upper end 22
into arcuate groove 16. This procedure is repeated for the other two retainer
members 12. One of
the contemplated advantages of the present invention is that, even in the
circumstance wherein
one of the retainer members 12 covers a portion of the indicia on the
biospecimen container, the
width of the retainer member 12 is small enough that the indicia may still be
reliably scanned.
A biasing means, for example an 0-ring 30, is positioned around upper ends 22
of
retainer members 12, below control plate 20. As best shown in Figures 3A and
3B, the biasing
means urges each retainer member 12 toward the innermost end of its
corresponding groove 16.
Thus a test tube 6 which is inserted between retainer members 12 is retained
there. As shown in
Figures 3A and 3B, a wide range of diameters of test tubes can be accommodated
by specimen
carrier 4.
It is contemplated that the arcuate shape of grooves 16 promotes both the easy
insertion of test tubes 6 of various diameters between retainer means 12 and
the reliable
maintenance of those test tubes between retaining means 12. It is also
contemplated that more
than three retaining means 12 may be desired in some circumstances, for
example to receive non-
round containers or very large or very small diameter test tubes, and the
modification of
specimen carrier 4 to include four or more retainer means 12 will now be
readily apparent to
those of skill in the art.
As shown in Figures 1 and 2, base member 10 has an upper annular edge 34, a
first groove 36, and a second groove 38 which extend about the circumference
of base
member 10. Base member 10 also has an orientating surface 42, which extends
along a portion of
the bottom edge of base 21.
First groove 36 and second groove 38 are provided to enhance the engagement of
specimen carrier 4 by manipulator devices, such as the grip of a robot arm
(not shown), as will
be described in more detail below. It is preferred that each of first groove
36 and second
groove 38 have a pair of diametrically opposed engagement flats to allow
simple engagement of
a manipulator device. One of the engagement flats of groove 38 is shown at 40
in Figure 2. It is
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CA 02581073 2007-03-07
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contemplated that, with this groove and engagement flat configuration, a
manipulator device
need only have a slot, such as a U-shaped slot, with an appropriate width to
engage one of
grooves 36 or 38 with the parallel sides of the slot abutting the engagement
flats, to securely lift
or otherwise manipulate specimen carrier 4.
Also in a preferred embodiment, specimen carrier 4 is constructed with the
pair of
engagement flats of one or both of grooves 36 and 38 orientated at preselected
angular
relationship to orientating surface 42, as will be described below in more
detail. It is
contemplated that, in many circumstances, only a single groove (either 36 or
38) will be desired,
but the presence of two grooves is presently preferred to allow for the
transfer of specimen
carrier 14 from one manipulator device to another, each of which can engage a
respective groove
to allow for a'hand-off ' of a specimen carrier 4 between manipulators.
In a presently preferred embodiment, base member 10 is manufactured from
Delrin and retainer members 12 are manufactured from stainless steel. It is
however
contemplated that specimen carrier 4 can be manufactured from other materials,
such as for
example nylon, polyethylene, stainless steel for base member 10 and high
strength or composite
reinforced plastic for retainer members 12. Further, depending upon the
maximum contemplated
height of test tube 6, the maximum contemplated mass of the contents of test
tube 6, etc.,
specimen carrier 4 can include a weight (not shown) in base member 10 to lower
the center of
gravity of specimen carrier 4.
It is also contemplated that in some circumstances it may be desired to
include an
identification means on specimen carriers 4 to operate in conjunction with, or
instead of, the
indica on the biospecimen container carried by the specimen carrier. While it
is contemplated
that a bar code can be employed as this identification means, it is presently
preferred to employ a
programable magnetic identification system such as the Idesco Microlog, sold
by Idesco
Engineering, 6940 Weinheim, Germany. This system includes a magnetic
identification device
which can be embedded in base member 10 and read by an appropriate reader to
uniquely
identify a specimen carrier 4.
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Figures 4 and 5 show four specimen carriers 4 carrying test tubes which are
being
transported on a moving conveyor 44 in a direction 46. Conveyor 44 can be any
suitable
conveyor track and in a presently preferred embodiment of the invention is a
conveyor sold by
Simplimatic Engineering Company, Lynchburg VA, USA as their Simpli-Flex
Modular
Conveyor System. As shown in the Figures, conveyor 44 is divided into two
lanes 54 and 56 by
lane definition means, which in one embodiment of the invention comprise a
series of arches 48
each of which retains three spaced support rails 50, one adjacent to the outer
edge of each lane,
and one located at the midpoint between the other two. Arches 48 are fixed
with respect to
conveyor 44 and retain the support rails 50 at a preselected height above the
surface of
conveyor 44. Each support rail 50 is equidistant from its adjacent support
rails 50 to define lanes
of equal width, and the rails extend along the length of conveyor 44 which can
include straight
and curved runs.
As shown in Figure 5, arches 48 maintain the spacing between adjacent support
rails 50 at a slightly wider than the width of specimen carrier 4 at upper
annular edge 34 so that
upper annular edge 34 slidably engages the lower surface corner of the support
rails 50 which
define the lane it is in. This engagement of upper annular edge 34 with rails
50 inhibits tipping of
specimen carrier 4 while moving on conveyor 44 and is referred to herein as
stabilizing means.
The support rail 50 which is located between and divides two adjacent lanes
can
include discontinuities at various points along the length of the conveyor 44
to permit individual
specimen carriers to be moved sideways from a first lane 54 to a second lane
56 or vice versa, as
will be described further below. Further, the outermost support rails 50 may
have similar
discontinuities to permit specimen carriers to be removed from or replaced on
a lane of
conveyor 44.
It is contemplated that support rails 50 can be made from aluminum or any
other
suitable material as will occur to those of skill in the art. Similarly,
arches 48 can be made from
aluminum or other suitable materials provided that the resulting combination
of support rails and
arches is sufficiently rigid that rails 50 prevent tipping of specimen
carriers 4. It has been found
that, when support rails 50 and arches 48 are fabricated from aluminum, a
sufficiently rigid
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CA 02581073 2007-03-07
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structure is obtained with respect to conveyor 44 when adjacent arches 48 are
spaced at three
foot intervals.
In some circumstances, it may be desired to have a conveyor 44 with more than
two lanes. In such cases, conveyor 44 can be wider and arches 48 can be
fabricated to retain
more than three support rails, thereby dividing a conveyor into more than two
lanes.
As discussed earlier, base member 10 has a planar orientating surface 42 which
extends along a portion of the bottom edge of base 21. Figures 4 and 5 show an
orientation
rai160 which is fixed to conveyor 44, such that it is just above the working
surface of the
conveyor. During transportation of a specimen carrier 4 by the conveyor, the
orientating
surface 42 abuts orientation rai160, and with the above-mentioned stabilizing
means maintains
the orientation of specimen carrier 4 with respect to conveyor 44.
Orientation rail 60 need only be present in locations on conveyor 44 wherein
it is
desired to have specimen carriers 4 in a known orientation, as will described
below.
Accordingly, if orientation rails 60 are only located at various points about
conveyor 44, an
orientation roller 62 is provided adjacent the upstream end of each
orientation rail 60 to facilitate
the engagement of orientating surface 42 to orientation rail 60. Orientation
roller 62 frictionally
engages base member 10 of a specimen carrier 4 causing the specimen carrier 4
to rotate with
respect to the adjacent orientation rail 60 and the movement of conveyor 44
urges specimen
carrier 4 downstream once the orientating surface 42 is aligned with
orientation rail 60.
Orientation of a specimen carrier 4 can be desired for a number of reasons,
the
most common of which is to position the machine readable indicia on test tube
6 into a known
position. Generally, a test tube 6 having a bar code 7 is loaded into a
specimen carrier 4, by
suitable means, with bar code 7 in a specific orientation with respect to
orientating surface 42.
Specimen carrier 4 then is placed on conveyor 44 and transported as desired.
When it necessary
to read bar code 7, an orientation rail 60 is provided adjacent the bar code
scanner and an
orientation roller 62 rotates the specimen carrier to engage orientating
surface 42 with orientation
rail 60 to position the bar code for scanning.
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CA 02581073 2007-03-07
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Figures 6A, 6B and 6C show a control station 61 for use with conveyor 44. The
particular control station 61 shown in these Figures provides for the
identification of specimen
carriers 4 and their conditional exchange from lane 54 to lane 56 and vice-
versa. As shown, the
support rail 50 between lanes 54 and 56 has two discontinuities 64 and 66 that
are sized to permit
movement of a specimen carrier 4 between lanes 54 and 56. The arch 48 which
supports a
segment 68 of the center support rail 50 is not shown in these Figures for
clarity.
Control station 61 includes traffic control devices, specifically two
singulators 74
and 78 and two diverters 82 and 86. Singulators 74 and 78 each operate to
separate a group of
specimen carriers 4 arriving at the singulator in a lane of conveyor 44 into
single, spaced,
specimen carriers 4 which may continue travel on conveyor 44 or otherwise be
further processed.
While singulator 74 is described herein in more detail, it will be understood
by
those of skill in the art that the construction and operation of singulator 78
only differs from the
discussion of singulator 74 in that it operates on specimen carriers arriving
in lane 56. Singulator
74 comprises a substantially semi-circular shaped gate 94 having a cutout 98.
Gate 94 can be
fabricated from any suitable material such as aluminum, plexiglass, etc., as
will be understood by
those of skill in the art. Gate 94 is attached to the axle 102 of a suitable
drive means which can
be any suitable method of rotating gate 94 through about 270 degrees or more
of rotation, and in
a presently preferred embodiment, this drive means is a dc motor. A suitable
control means, not
shown, operates the drive means to move gate 94 as desired.
Cutout 98 has a shape which is complementary to the shape of base member 10 of
specimen carriers 4 and singulator 74 is mounted adjacent conveyor 44 to
permit gate 94 to
extend below the support rail 50 and into lane 54 as shown in the Figures.
In operation, one or more specimen carriers (124, 144 and 148) accumulate in a
lane of conveyor 44 upstream of singulator 74 with the specimen carrier 124
closest to singulator
74 being received in cutout 98 as shown in Figure 6A.
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When it is desired to permit specimen carrier 124 to continue past singulator
74,
gate 94 is rotated to the position shown in Figure 6B, thus releasing specimen
carrier 124 from
cutout 98 for continued movement along conveyor 44. As shown in the Figure,
the curved
portion of gate 94 blocks the next specimen carrier 144 from movement along
conveyor 44. Gate
94 is then rotated back to the position shown in Figure 6C wherein specimen
carrier 144 engages
cutout 98. The time intervals between iterations of this process are selected
to provide the desired
spacing of specimen carriers on conveyor 44 and can be used to stagger the
arrival of specimen
carriers 4 at stations on conveyor 44.
As will be understood by those of skill in the art, singulators 74 and 78 are
also
capable of operating as blocking gates, i.e. to prevent movement of upstream
specimen carriers
past traffic control or other stations when gates 94 are in the position shown
in Figure 6B. If
desired, gates 94 can also be rotated such that the flat surface opposite
cutout 98 is adjacent
support rai150. In this position (which is not shown in the Figures) the gate
does not extend into
the adjacent lane and the lane is "open" for free movement of specimen
carriers past the
singulator.
Diverters 82 and 86 operate to transfer specimen carriers 4 between lanes 54
and
56 through corresponding discontinuities 66 and 64. While diverter 82 is
described herein in
more detail, it will be understood by those of skill in the art that the
construction and operation of
diverter 86 only differs from that of diverter 82 in that it operates to
transfer specimen carriers 4
from lane 56 to lane 54.
Diverter 82 comprises a cam-shaped actuator 104 which is mounted at 112 to a
drive means, not shown. Actuator 104 can be constructed from any suitable
material, such as
aluminum or plexiglass, as will be understood by those of skill in the art.
The drive means for
actuator 104 can be any suitable drive mechanism as will also be understood by
those of skill in
the art and, in a presently preferred embodiment, is a dc motor. Actuator 104
has a cam surface
108 which is shaped to abut and move specimen carriers 4 from the lane in
which the diverter is
located, through the corresponding discontinuity, and into the adjacent lane.
Diverter 82 is
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CA 02581073 2007-03-07
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mounted adjacent to conveyor 44 to permit actuator 104 to extend into lane 54,
rotate below
support rail 50 and abut the base member 10 of specimen carriers 4.
In Figure 6A, specimen carrier 128 is approaching diverter 82 and is to be
transferred from lane 54 to lane 56. Actuator 104 of diverter 82 is shown in
Figure 6A in its fully
retracted position wherein cam surface 108 does not extend into lane 54. When
it is desired to
transfer specimen carrier 128 from lane 54 to 56, actuator 104 of diverter 82
is rotated to extend
into lane 54, as shown in Figure 6B, and cam surface 108 and the continued
movement of
conveyor 44 cooperate to move specimen carrier 128 through discontinuity 66 to
lane 56 as
shown in Figures 6B and 6C. After a lane change has been effected, actuator
104 is retracted to
its starting position.
The particular configuration of control station 61 is intended to examine and
sort
specimen carriers arriving in lanes 54 and 56. Specifically, an indicia
reading means, which is
not shown in Figures 6A through 6C for clarity, is located adjacent lane 52
between singulator
74 and diverter 82 to read the indicia on the test tubes on specimen carriers
4. In a presently
preferred embodiment of the invention, the indicia reading means is a bar code
scanner which
interfaces with a specimen management system, such as a laboratory information
system.
When a bar code scanner is employed as indicia reading means, it can be
desired
to rotate the specimen carrier 4, and the test tube on it, with respect to the
bar code scanner to
enhance scanning of the bar code. Accordingly, a rotator 90 is provided which
comprises wheel
116 and a drive means 120. Wheel 116 is mounted adjacent to conveyor 44 and
extends
underneath support rail 50 to engage and rotate the base member 10 of an
oncoming specimen
carrier 4 to rotate the specimen carrier about its vertical axis.
In control station 61, singulators 74 and 78 are operable to allow one
specimen
carrier 4 at a time to be examined by the indicia reading means. Specimen
carriers 4 arriving on
lane 56 are, after release from singulator 78, transferred to lane 54 by
diverter 86 for scanning by
the indicia reading means. Specimen carriers 4 arriving on lane 54 travel
directly from singulator
CA 02581073 2007-03-07
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74 to the indicia reading means. Singulators 74 and 78 cooperate to ensure
that only a single
specimen carrier 4 is to be read by the indicia reading means at one time.
When the indicia reading means has examined the indicia on the test tube on
the
specimen carrier 4 being scanned, the laboratory information system or other
specimen
management system determines on which lane the specimen carrier 4 should leave
control
station 61 and diverter 82 is operated accordingly.
In Figures 6A through 6C, a specimen carrier 124 which arrived on lane 54 is
scanned by the indicia reading means and transferred to lane 56 for exit from
control station 61.
Specimen carrier 132 which arrived on lane 56 is transferred to lane 54
(Figure 6B) for scanning
by the indicia reading means and, depending upon the need of the specimen
management system,
can exit control station 61 via either lane 54 or 56.
Figure 7 and Figure 8 illustrate another control station 200 in accordance
with the
present invention. In these Figures, conveyor 44 is shown transporting
specimen carriers 156,
160, and 164 and each specimen carrier is carrying a test tube marked with an
identifying bar
code 165. In Figure 7, specimen carriers 156, 160 and 164 are transported by
conveyor 44 from
right to left. An orientation roller 168, similar to orientation roller 62 in
Figure 4, rotates the
specimen carriers to engage an orientation rail 172, similar to orientation
rail 60 discussed in
detail earlier, thereby fixing the rotational orientation of the specimen
carriers with respect to the
orientation rail 172. A singulator 176, ensures that only single specimen
carriers, such as
specimen carrier 160, travel down conveyor 44 to the specimen carrier handling
means,
described below.
A specimen carrier handler means for selectively removing and/or placing a
specimen carrier on conveyor 44 is shown as handler 180. Handler 180 includes
an rotor arm 186
and a motor means 190, such as a dc servo motor, to rotate rotor arm 186.
Rotor arm 186
includes two grips 194 which are both spaced an equal radius from motor means
190. Grips 194
each have a substantially U-shaped cutout 198 which is arranged such that,
when cutout 198 is
over lane 56 of conveyor 44, the parallel sides of cutout 198 are parallel to
support rails 50.
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CA 02581073 2007-03-07
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Orientating roller 168 and orientation rail 172 cooperate to ensure that
specimen carriers 156,
160 and 164 approach handler 180 with the engagement flats in groove 38
parallel to support
rails 50.
Cutouts 198 are sized to engage groove 38 of a specimen carrier, with the
parallel
sides of cutout 198 engaging the engagement flats of groove 38 thereby
preventing the specimen
carrier from rotating in cutout 198. In Figures 7 and Figure 8, cutouts 198 of
rotor 190 have
engaged groove 38 of specimen carriers 160 and 164.
In operation a specimen carrier, such as specimen carrier 160, is released by
singulator 176 and travels along conveyor 44 to rotor arm 186. Groove 38 of
specimen carrier
160 engages cutout 198 in one end of rotor arm 186 as shown in Figure 7 and a
test tube rotating
means 202 engages the test tube.
Specifically, test tube rotating means 202 includes a chassis 206, a driven
roller
210 and two idler rollers 214. A motor means 218 is mounted to chassis 206 and
drives driven
roller 210 via a belt drive comprising pulleys 222 and 226 and drive belt 230.
Idler rollers 214
rotate freely on suitable bearings. Drive roller 210 and idler rollers include
suitable contact
surfaces 234 and 238 to frictionally engage the outer surface of test tube 242
carried by specimen
carrier 160.
Test tube rotating means 202 has two positions, an open position and a rotate
position. Figures 7 and Figure 8 show the tube rotator 202 in the rotate
position wherein drive
roller 210 and idler rollers 214 are in engagement with the test tube. In the
open position, drive
roller 210 and idler rollers 214 are spaced away from each other to permit
test tube 242 to enter
or exit from the area between drive roller 210 and idler rollers 214.
In the illustrated rotate position, drive roller 210 is rotated by motor 246
thereby
rotating test tube 242 relative to specimen carrier 160, which is prevented
from rotating by cutout
198 of rotor arm 186. A bar code scanner, identified at 250 in Figure 8, reads
the bar code 165 on
the test tube. In addition to allowing bar code 165 to be scanned, test tube
rotating means 202
~ ~~wv.
16. .~..... . .
CA 02581073 2007-03-07
-15-
allows the test tube to be orientated, relative to the base member 10 of a
specimen carrier such
that the bar code is in a known position.
Rotor 180 allows test tubes carried on specimen carriers to be removed from or
placed on conveyor 44. Specifically, a specimen carrier can be placed in or
removed from cutout
198 when in the manipulating position occupied by specimen carrier 164 in the
Figures. Rotor
180 rotates as needed to transfer specimen carriers between lane 56 and the
manipulating
position.
The removal and replacement of a specimen carrier can be accomplished in any
suitable manner including, by a laboratory technician or by a robot
manipulator which engages
groove 36. It is also contemplated that in some circumstances it may be
desired to remove or
load a test tube from or on a specimen carrier in the manipulating position.
For example, the test
tube of specimen carrier 164 can be removed by a conventional robot and empty
specimen
carrier 164 returned to conveyor 44 for subsequent recovery and reuse.
Similarly, a test tube can
be loaded into an empty specimen carrier in the manipulating position in any
suitable manner. In
this latter case, it is contemplated that test tube rotating means 202 will be
employed to orientate
bar code 165 with respect to base member 10, prior to releasing the specimen
carrier for
continued transport by conveyor 44 downstream of control station 200.
It will be understood by those of skill in the art that a variety of other
control
stations can be constructed from the components described herein and with
others without
departing from the scope of the present invention.
The above-described embodiments of the invention are intended to be examples
of the present invention and alterations and modifications may be effected
thereto, by those of
skill in the art, without departing from the scope of the invention which is
defined solely by the
claims appended hereto.
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