Integral centrifuge tube and specimen slide

• US 5,260,032 A
• Filed: 12/27/1991
• Issued: 11/09/1993
• Est. Priority Date: 12/27/1991
• Status: Expired due to Term

• Current Assignee: IRIS International Inc. (Danaher Corporation)
• Original Assignee: Davstar California Incorporated
• Inventors: Muller, Louis F.
• Primary Examiner(s): Housel, James C.
• Assistant Examiner(s): WALLENHORST, MAUREEN
• Application Number:
  US07/815,133
• Time in Patent Office: 683 Days
• Field of Search: 422/58, 422/61, 422/72, 422/102, 436/45, 436/46, 436/165, 436/177, 436/180, 436/808, 436/810, 435/296, 435/310, 494/16, 356/246, 356/244, 356/440, 356/427, 359/894
• US Class Current: 422/548
• CPC Class Codes: B01L 3/5021 Test tubes specially adapted for centrifugation purposes centrifuges B04B5/04
• CPC Class Codes: G02B 21/34 Microscope slides, e.g. mounting specimens on microscope slides
• CPC Class Codes: Y10S 436/81 Tube, bottle, or dipstick
• CPC Class Codes: Y10T 436/111666 Utilizing a centrifuge or compartmented rotor
• CPC Class Codes: Y10T 436/112499 with sample on test slide
• CPC Class Codes: Y10T 436/25375 Liberation or purification of sample or separation of material from a sample [e.g., filtering, centrifuging, etc.]

Abstract

A device for use in a centrifuge to automatically prepare microscope slide specimens from samples of body fluids. A centrifuge tube and specimen slide are formed integrally in a unitary device. A lens clearance section is provided as a planar surface to avoid interference between the device and the rotatable lenses of a turret microscope while the device is in viewing position on the microscope stage. The device is constructed to minimize packing of sediment and other constituent elements of the sample at the entrance to the slide member and is so configured as to admit of a step during the centrifuge process which flexes the slide member to enhance the distribution of cells deposited therein.

Claims

1. An integral centrifuge tube and specimen slide comprising:

a tubular member portion and a hollow slide member portion integrally joined together at a transverse juncture line with a transition region between the two portions in which the tubular member portion reduces in size and changes shape to merge with the slide member portion;

the tubular member portion having a proximal end with an opening therein for the admission of fluid samples, a distal end at said juncture line, and a generally cylindrical side wall with front and rearward sides having a predetermined thickness and tapering slightly from said proximal end at a predetermined conical angle;

the hollow slide member portion having opposed upper and lower walls and a pair of side walls all having predetermined thicknesses;

said tubular member portion further having a first planar surface extending along the rearward side thereof and having a predetermined thickness, and a second planar surface extending along the front side of the tubular member portion from the juncture line to a point near the midpoint of the tubular member portion and intersecting the tubular member portion along a curved line of intersection, said second planar surface being joined with the cylindrical side wall of the tubular member portion along the line of intersection therewith, said second planar surface having a wall thickness approximately equal to the predetermined side wall thickness of said tubular member portion except in said transition region where the wall thickness of said second planar surface diminishes to a thickness equal to said predetermined thickness of the upper wall of the slide member portion.

2. The device of claim 1 wherein said tubular member portion further includes a third planar surface defining the under side of said transition region, said third planar surface extending from said first planar surface and diminishing in wall thickness from the predetermined thickness of said first planar surface to a thickness matching the predetermined thickness of the lower wall of said slide member portion.

3. The device of claim 2 wherein said slide member portion includes a hollow viewing chamber for receiving a specimen, said chamber being formed by said upper wall, said lower wall and said pair of side walls of said slide member portion, wherein the walls surrounding said chamber are sufficiently thin to permit the slide member portion to be readily flexed in the region of the viewing chamber.

4. The device of claim 3 wherein the slide member portion includes a terminal end tab element extending beyond the walls of the viewing chamber and forming a terminal end to said chamber remote from said tubular member portion to receive the application of external forces for flexing the viewing chamber to improve the even distribution of material within the viewing chamber.

5. The device of claim 3 wherein the upper and lower walls of the viewing chamber are approximately 0.010 to 0.014 inches thick.

6. The device of claim 5 wherein the upper and lower walls of the viewing chamber are spaced apart by a distance of approximately 0.010 to 0.012 inches.

7. The device of claim 6 wherein the overall thickness of the slide member portion is approximately 0.035 inches.

8. The device of claim 3 wherein the first planar surface and the second planar surface converge in the direction of the juncture line at a first selected angle, and wherein the second planar surface and the third planar surface converge in the direction of the juncture line at a second selected angle which is greater than said first selected angle in order to minimize the packing of constituent materials in a fluid sample outside of the viewing chamber in said slide member portion.

9. The device of claim 3 wherein said second and third planar surfaces form upper and lower walls of said transition region adjacent the distal end of the tubular member portion which diminish in thickness from the predetermined thickness of the cylindrical side wall of the tubular member portion to the predetermined thickness of the upper and lower walls of the slide member portion.

10. The device of claim 9 wherein said transition region further includes side walls which diminish in thickness from the predetermined thickness of the cylindrical side wall of the tubular member portion to the predetermined thickness of said pair of side walls of the slide member portion viewing chamber to render said slide member portion readily flexible in a direction generally transverse to said first, second and third planar surfaces.

11. The device of claim 10 wherein said upper and lower walls of said transition region diminish from a wall thickness of approximately 0.050 to 0.055 inches to a thickness of approximately 0.012 inches at the entrance of said slide member portion.

12. The device of claim 11 wherein the side walls of the transition region diminish from a thickness of approximately 0.050 to 0.055 inches to a thickness of approximately 0.012 inches at the entrance of the slide member portion, beginning approximately midway in said transition section.

13. The device of claim 1 wherein said tubular member portion includes a lip extending about the opening at the proximal end, except along said first planar surface.

14. The device of claim 1 further including a plug shaped to fit within the opening at the proximal end of the tubular member portion, said plug being closed at one end and open at the other end to define a hollow space within the plug, said plug having at least one outwardly protruding peripheral ridge spaced from the closed end for effectively sealing said opening.

15. The device of claim 14 wherein said plug further includes a laterally extending tab adjacent the closed end to facilitate removal of the plug from the opening at the proximal end of the tubular member portion.

21. The device of claim 5 wherein the thickness of the upper and lower walls of the viewing chamber is 0.012 inches thick.

22. The device of claim 6 wherein the distance between the upper and lower walls of the viewing chamber is 0.011 inches.

16. In an integral specimen collection tube and microscope slide device which comprises in combination:

a tube member portion having means defining an entrance opening at a proximal end and an exit opening at a distal end, said tube member portion having a generally cylindrical side wall of a predetermined thickness with a first flat planar surface extending along a rear side thereof;

a slide member potion joined to the tube member portion at said distal end and extending longitudinally beyond the tube member portion to a closed terminal end of the device, the slide member portion comprising flat, optically transparent, opposed parallel upper and lower walls and side walls of a predetermined thickness defining a chamber for receiving and displaying a specimen for viewing through a microscope having a slide supporting stage; and

a lens clearance section comprising means defining a reduced cross-section of the tube member portion which extends from the slide member portion to a point on the cylindrical side wall of the tube member portion remote from the slide member portion;

the improvement comprising;

a second flat planar surface extending from a juncture line between the tube member portion and the slide member portion along the upper wall of said slide member portion and converging at a first selected convergence angle with the rear side first flat planar surface, said second planar surface having a wall thickness through a major portion thereof which is generally equal to the predetermined thickness of the cylindrical side wall of the tube member portion, said second planar surface wall thickness diminishing in a region adjacent said juncture line to match the thickness of the upper wall of the slide member portion.

17. The combination of claim 16 further comprising a transition portion having a lower wall section formed as a third flat planar surface joined to the distal end of said rear side first flat planar surface and extending at a second selected convergence angle thereto to connect with the lower wall of said slide member portion adjacent said juncture line, the lower wall section of said transition portion having a tapered wall diminishing in thickness from the thickness of the rear side first flat planar surface to match the thickness of the lower wall of the slide member portion.

18. The combination of claim 17 wherein said second flat planar surface and said lower wall section in said transition portion have inner surfaces converging at a third selected convergence angle greater than the first selected convergence angle to define an entrance region for fluid specimen constituent elements entering the specimen receiving chamber of said slide member portion.

19. The combination of claim 16 wherein the upper and lower walls and the side walls of said slide member portion are sufficiently thin as to render the specimen receiving chamber of the slide member portion flexible to permit flexing of the slide member portion relative to the tube member portion.

20. The combination of claim 19 wherein the walls of the slide member portion are joined together and extend beyond the closed terminal end of the device so as to form a solid tab element at the distal end of said slide member portion for effecting the flexing of the slide member portion to more evenly distribute specimen constituent elements in the slide member portion.