Device for the positionally correct feeding of test strips to an analysis unit

• US 5,298,425 A
• Filed: 02/09/1993
• Issued: 03/29/1994
• Est. Priority Date: 02/13/1992
• Status: Expired due to Fees

• Current Assignee: Boehringer Mannheim GmbH (Roche Holding AG)
• Original Assignee: Boehringer Mannheim GmbH (Roche Holding AG)
• Inventors: Kuhn, Hans-Jurgen, Sattler, Stephan, Menzler, Horst
• Primary Examiner(s): Housel, James C.
• Assistant Examiner(s): Carpenter, Robert
• Application Number:
  US08/015,373
• Time in Patent Office: 413 Days
• Field of Search: 422/63, 422/58, 422/67, 422/99, 436/43, 198/399, 198/400, 221/167, 221/173
• US Class Current: 436/43
• CPC Class Codes: B65G 47/1407 the articles being fed from a container, e.g. a bowl
• CPC Class Codes: G01N 2035/00039 Transport arrangements specific to flat sample substrates, e.g. pusher blade
• CPC Class Codes: G01N 35/00029 provided with flat sample substrates, e.g. slides G01N35/028 takes precedence
• CPC Class Codes: Y10T 436/11 Automated chemical analysis

Abstract

Device for the positionally correct feeding of test strips to an analysis unit. The test strips 10 include a base layer and at least one raised test field fixed to one side of the base layer. The test strips are contained disordered with respect to their longitudinal axis rotation position in a storage container. A separation and position correcting device 1 serves to feed the test strips 10 individually one after the other in a defined position to the analysis unit. Simplicity of construction and reliable operation are achieved due to the fact that the separation and position correcting device 1 includes a position correcting stage 30 with two rolls, between which a narrow gap 35 exists. The rolls rotate so that the surface 31a of the first roll 31 moves in the region of the gap 35 from top to bottom, while the surface 32a of the second roll 32 moves from bottom to top. The first roll 31 includes peripheral raised webs 37 which are in alignment with test field-free regions of the test strips 10. The second roll 32 is provided with axially parallel running drivers 38. The width of the gap 35 in the region of the raised webs 37 is smaller than the thickness of the test strips including the test field.

Claims

1. In an apparatus for the positionally correct feeding of test strips to an analysis unit, wherein said test strips include a base layer with at least one test field disposed on one side of the base layer and a plurality of regions on said one side of said base layer where no test field is present, said test field being raised with respect to the plurality of regions where no test field is present, said test strips being disordered with respect to their longitudinal axis rotation position in a storage container, said apparatus having a separation and position correcting device provided for feeding the test strips individually in a defined position to the analysis unit, the improvement wherein said separation and position correcting device comprises:

rotation position correcting means for correcting a rotation position of test strips with respect to the longitudinal axis thereof, said rotation position correcting mans having two rolls disposed adjacent each other with a gap therebetween, said rolls being disposed to rotate in a same direction of rotation wherein an outer peripheral surface of a first of said rolls adjacent said gap moves downward with respect to said gap, and an outer peripheral surface of a second of said rolls moves upward at said gap, said outer peripheral surfaces of said rolls forming a funnel shaped space above said gap, said space for receiving said test strips into said gap in an essentially parallel orientation of said gap and said test strips,

wherein said first roll includes a plurality of peripheral raised webs on the outer peripheral surface thereof, said plurality of webs being disposed to be in alignment with at least a part of said regions of the test strips where no test field is present, and

wherein said second roll is different form said first roll and includes a plurality of running driver portions, said running driver portions being parallel to said gap,

wherein a width of the gap is reduced in a region of the plurality of raised webs such that a thickness of the test strips, including a test field, is greater than the width of the gap.

2. An apparatus for the positionally correct feeding of test strips as recited in claim 1, wherein the test strips are multiple test strips having a plurality of test fields disposed adjacent each other on the base layer with a test field free interstice between adjacent test fields, and wherein said first roll includes at least three peripheral raised webs, and at least one of said three webs is disposed in a test field free interstice of said test strips.

3. An apparatus for the positionally correct feeding of test strips as recited in claim 1, wherein said webs comprise rings of an elastic rubber material, and wherein said first roll comprises peripherally disposed grooves in a circumference thereof, and wherein said rings are positioned in said grooves.

4. An apparatus for the positionally correct feeding of test strips as recited in claim 1, wherein said plurality of running driver portions of said second roll comprise axial grooves in an otherwise smooth circumferential surface.

5. An apparatus for the positionally correct feeding of test strips as recited in claim 1, wherein said rotation positioning correcting means further comprises:

a longitudinal position guide for longitudinally positioning the test strips, wherein said test strips are guided in a longitudinal direction such that said part of said plurality of regions of said test strips where no test field is present are in alignment with the webs of the first roll.

6. An apparatus for the positionally correct feeding of test strips as recited in claim 1, wherein said separation and position correcting means further comprises separation means for separating said test strips, said separation means comprising a rotating drum having a slot in an outer peripheral surface thereof, said slot being disposed parallel to an axis of said drum, said rotating drum including a cam means arranged therein, adjacent said slot on an inner surface of the drum for guiding the test strips into the slot, wherein the test strips are guided to individually exit the drum.

7. An apparatus for the positionally correct feeding of test strips as recited in claim 1, wherein said separation and position correcting means includes separation means for separating said test strips, said separation means comprising a third roll which is a substantially rotationally symmetric rotating roll having parallel receivers therein, said parallel receivers for receiving individual test strips, said separation means further including stripping means for stripping a test strip which is entangled with one of said individual test strips disposed in one of said parallel receivers.

8. An apparatus for the positionally correct feeding of test strips as recited in claim 7, wherein said third roll includes a flattened portion on an outer surface thereof adjacent to each of said parallel receivers, and said separation and position correction means further comprises:

an obliquely inclined surface disposed adjacent to he third roll, with a distance between the third roll and the obliquely inclined surface such that the distance therebetween, at a smallest point thereof, is smaller than a thickness of a test strip including a test field.

9. An apparatus for the positionally correct feeding of test strips as recited in claim 1, wherein the stripping means comprises a stripping member disposed adjacent said third roll, said stripping member being radially guided relative to a rotating axis of the roll, said stripping member engaging the surface of the roll to strip a test strip which is entangled with the test strip located in one of said parallel receivers.

10. An apparatus for the positionally correct feeding of test strips as recited in claim 1, wherein the separation means further comprises a third roll, said third roll being substantially cylindrical and having parallel receivers disposed thereon, said parallel receivers for receiving individual test strips, said separation means including stripping means for stripping a test strip which is entangled with one of said individual test strips disposed in one of said axially parallel receivers.

11. An apparatus for the positionally correct feeding of test strips to an analysis unit, comprising the steps of:

providing a plurality of test strips which include a base layer and at least one test field disposed on one side of the base layer, said at least one test field being raised with respect to the one side of the base layer, said test strips being disordered with respect to their longitudinal axis rotation position in a storage container;

providing a separation and position correcting device for feeding the test strips individually in a defined position with respect to a longitudinal axis rotation position of the analysis unit;

providing a first roll having a plurality of peripheral raised webs on a surface thereof, said webs being disposed to be in alignment with regions of the test strips which are free of test fields, and also providing a second roll which is disposed adjacent to said first roll wherein said first and second rolls rotate next to each other with a gap therebetween, and wherein said second roll includes a plurality of running driver portions, said running driver portions being substantially parallel to said gap;

rotating said first roll and said second roll in a same direction of rotation wherein an outer peripheral surface of said first roll adjacent said gap moves downward with respect to said gap, and an outer peripheral surface of said second roll adjacent said gap moves upward; and

feeding at least one of said plurality of test strips toward said gap, whereby said first and second rolls having said peripheral raised webs and said running driver portions, respectively, cooperate to correct a position of each of the test strips such that said test fields face the outer peripheral surface of said first roll.