Use of a bubble paddle tumble stirrer to mix the contents of a vessel while the contents are being removed

• US 6,461,034 B1
• Filed: 11/14/2001
• Issued: 10/08/2002
• Est. Priority Date: 11/14/2001
• Status: Expired due to Term

• Current Assignee: V&P Scientific, Inc.
• Original Assignee: V & P Scientific, Inc.
• Inventors: Cleveland, Patrick H.
• Primary Examiner(s): SOOHOO, TONY GLEN
• Application Number:
  US09/993,853
• Time in Patent Office: 328 Days
• Field of Search: 366/273, 366/274, 366/325.92, 366/329.1, 366/342, 366/343, 366/292, 366/293, 366/297
• US Class Current: 366/273
• CPC Class Codes: B01F 23/023 Preventing sedimentation, conglomeration or agglomeration of solid ingredients during or after mixing by maintaining mixed ingredients in movement
• CPC Class Codes: B01F 27/1125 with vanes or blades extending parallel or oblique to the stirrer axis
• CPC Class Codes: B01F 27/60 with stirrers rotating about a horizontal or inclined axis
• CPC Class Codes: B01F 33/453 using supported or suspended stirring elements
• CPC Class Codes: B01F 33/4531 using an axis supported in several points for mounting the stirring element
• CPC Class Codes: B01F 35/75 Discharge mechanisms
• CPC Class Codes: B01F 35/79 Preventing lumping, or comminuting lumps, during feeding or discharging, e.g. by means of vibrations, or by scrapers
• CPC Class Codes: B01L 3/02 Burettes; Pipettes
• CPC Class Codes: B01L 3/5085 for multiple samples, e.g. microtitration plates
• CPC Class Codes: G01N 2035/00534 Mixing by a special element, e.g. stirrer
• CPC Class Codes: G01N 35/1065 Multiple transfer devices

Abstract

The contents of a vessel are mixed while the contents are being removed from the vessel. A bubble-paddle tumble stirrer having at least one linear array of rounded-edge blades is disposed horizontally in the vessel for rotation about the longitudinal axis of the array. The vessel contour defines openings at nodes between the blades for enabling the mixed vessel contents to be removed from within the openings by use of pipettes inserted into the openings. The openings extend to the bottom of the vessel. The vessel contour also defines a protrusion that closely matches the edge profile of the linear array of blades for defining a narrow duct when the edges of the blades rotate adjacent the matching vessel protrusion to thereby enhance turbulence in the vessel contents as the stirrer is being rotated.

Claims

1. A method of mixing the contents of a vessel while said contents are being removed therefrom, comprising the steps of:

(a) using as said vessel, a vessel in which a bubble-paddle tumble stirrer having a linear array of rounded-edge blades is disposed horizontally for rotation about the longitudinal axis of the array, wherein the vessel contour at one side of the array defines openings at nodes between the blades for enabling said mixed vessel contents to be removed from within said openings by use of removal means inserted into said openings; and

(b) rotating the stirrer to mix said vessel contents while said contents are being removed from the vessel.

2. A method according to claim 1, wherein the vessel contour defines a protrusion that closely matches the edge profile of the linear array of blades for defining a narrow duct when the edges of the blades rotate adjacent the matching vessel protrusion to thereby enhance turbulence in the vessel contents as the stirrer is being rotated.

3. A method according to claim 2, wherein said openings extend to the vessel bottom for enabling said mixed vessel contents adjacent the vessel bottom to be removed by use of said removal means inserted into said openings.

4. A method according to claim 1, wherein said openings extend to the vessel bottom for enabling said mixed vessel contents adjacent the vessel bottom to be removed by use of said removal means inserted into said openings.

5. A method according to claim 1, wherein a plurality of said bubble-paddle tumble stirrers are so disposed in parallel within said vessel.

6. A method according to claim 5, wherein beneath each stirrer the vessel contour defines a protrusion that closely matches the edge profile of the respective linear array of blades for defining a narrow duct when the edges of the blades rotate adjacent the matching vessel protrusion to thereby enhance turbulence in the vessel contents as the stirrer is being rotated.

7. A method according to claim 6, wherein said openings extend to the vessel bottom for enabling said mixed vessel contents adjacent the vessel bottom to be removed by use of said removal means inserted into said openings.

8. A method according to claim 7, wherein the vessel contour defines said openings at both of the opposing sides of each stirrer.

9. A method according to claim 5, wherein the vessel contour defines said openings at both of the opposing sides of each stirrer.

10. A method according to claim 1, wherein opposing edges of the blades have opposing magnetic polarities, and wherein step (b) comprises the step of:

(c) so disposing the vessel within a varying magnetic field as to cause the stirrer to rotate.

11. A method according to claim 10, wherein step (c) comprises the step of:

(d) so disposing the vessel within a rotating magnetic field of a rotary magnet.

12. A method according to claim 1, wherein step (b) comprises the step of:

(c) using a magnetic coupling disposed at an end of the array to rotate the stirrer.

13. A method according to claim 1, wherein step (b) comprises the step of:

(c) from time to time, reversing the direction of said rotation.

14. A device for use in mixing the contents of a vessel while said contents are being removed therefrom, comprising:

a vessel; and

a bubble-paddle tumble stirrer having a linear array of rounded-edge blades disposed horizontally in the vessel for rotation about the longitudinal axis of the array to thereby mix the contents of said vessel;

wherein the vessel contour at one side of the array defines openings at nodes between the blades for enabling said mixed contents to be removed from within said openings by use of removal means inserted into said openings while the stirrer is being rotated to mix said vessel contents.

15. A device according to claim 14, wherein the vessel contour defines a protrusion that closely matches the edge profile of the linear array of blades for defining a narrow duct when the edges of the blades rotate adjacent the matching vessel protrusion to thereby enhance turbulence in the vessel contents as the stirrer is being rotated.

16. A device according to claim 15, wherein said openings extend to the vessel bottom for enabling said mixed vessel contents adjacent the vessel bottom to be removed by use of said removal means inserted into said openings.

17. A device according to claim 14, wherein said openings extend to the vessel bottom for enabling said mixed vessel contents adjacent the vessel bottom to be removed by use of said removal means inserted into said openings.

18. A device according to claim 14, wherein a plurality of said bubble-paddle tumble stirrers are so disposed in parallel within said vessel.

19. A device according to claim 18, wherein beneath each stirrer the vessel has a contour that closely matches the contour of the respective linear array of blades for defining a narrow space in which the vessel contents are mixed as the stirrers are rotated.

20. A device according to claim 19, wherein the vessel has said opening-defining contours at both of the opposing sides of each stirrer.

21. A device according to claim 20, wherein beneath each stirrer the vessel contour defines a protrusion that closely matches the edge profile of the respective linear array of blades for defining a narrow duct when the edges of the blades rotate adjacent the matching vessel protrusion to thereby enhance turbulence in the vessel contents as the stirrer is being rotated.

22. A device according to claim 21, wherein said openings extend to the vessel bottom for enabling said mixed vessel contents adjacent the vessel bottom to be removed by use of said removal means inserted into said openings.

23. A device according to claim 22, wherein the vessel contour defines said openings at both of the opposing sides of each stirrer.

24. A device according to claim 20, wherein the vessel contour defines said openings at both of the opposing sides of each stirrer.

25. A device according to claim 14, wherein opposing edges of the blades have opposing magnetic polarities for enabling the stirrer to be rotated by so disposing the vessel within a varying magnetic field as to cause the stirrer to rotate.

26. A device according to claim 14, wherein a magnetic coupler is disposed at an end of the array to enable rotation of the stirrer by use of magnetic coupling.

27. A device according to claim 14, further comprising:

means for rotating the stirrer to thereby mix said vessel contents.

28. A device according to claim 14, further comprising:

means for from time to time reversing the direction of said rotation.