EP0199696A2 - Laborzentrifuge - Google Patents

Laborzentrifuge Download PDF

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Publication number
EP0199696A2
EP0199696A2 EP86850144A EP86850144A EP0199696A2 EP 0199696 A2 EP0199696 A2 EP 0199696A2 EP 86850144 A EP86850144 A EP 86850144A EP 86850144 A EP86850144 A EP 86850144A EP 0199696 A2 EP0199696 A2 EP 0199696A2
Authority
EP
European Patent Office
Prior art keywords
disk
cover
centrifugal
ring
centrifugal rotor
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP86850144A
Other languages
English (en)
French (fr)
Other versions
EP0199696A3 (de
Inventor
Ingemar Wahl
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Landstingens Inkopscentral LIC
Original Assignee
Landstingens Inkopscentral LIC
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Landstingens Inkopscentral LIC filed Critical Landstingens Inkopscentral LIC
Publication of EP0199696A2 publication Critical patent/EP0199696A2/de
Publication of EP0199696A3 publication Critical patent/EP0199696A3/de
Withdrawn legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B04—CENTRIFUGAL APPARATUS OR MACHINES FOR CARRYING-OUT PHYSICAL OR CHEMICAL PROCESSES
    • B04B—CENTRIFUGES
    • B04B5/00—Other centrifuges
    • B04B5/04—Radial chamber apparatus for separating predominantly liquid mixtures, e.g. butyrometers
    • B04B5/0407—Radial chamber apparatus for separating predominantly liquid mixtures, e.g. butyrometers for liquids contained in receptacles
    • B04B5/0414—Radial chamber apparatus for separating predominantly liquid mixtures, e.g. butyrometers for liquids contained in receptacles comprising test tubes
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B04—CENTRIFUGAL APPARATUS OR MACHINES FOR CARRYING-OUT PHYSICAL OR CHEMICAL PROCESSES
    • B04B—CENTRIFUGES
    • B04B7/00—Elements of centrifuges
    • B04B7/02—Casings; Lids
    • B04B2007/025—Lids for laboratory centrifuge rotors

Definitions

  • the present invention is relative to centrifuges.
  • it concerns a laboratory centrifuge for centrifuging capillary tubes.
  • hematocrit tube a capillary tube, a so-called hematocrit tube, with blood.
  • the tube which extends radially in the centrifuge, is then centrifuged at a high number of revolutions.
  • centrifugation is normally done at a number of revolutions at approximately 10.000 RPM, causing a relative centrifugal force (RCF) of approximately 10.000 grams for a normal size of the centrifugal disk. It is thus a matter of tremendous force, to which the thin hematocrit tubes are subjected, and these tubes, which are made of glassy, can easily break due to for instance invisible, small manufacturing defects or their mal- positioning in the carrier.
  • the handling of broken tubes is per se no large problem, although we would rather be without that nuisance.
  • the real problem occurs when one or several tubes break during centrifugation and liquid from the tubes ends up in and about the centrifuge.
  • the great centrifugal force of the tubes causes, when the tubes break, what can resemble a minor explosion and liquid is flung out in all directions.
  • the liquid is then urged by the centrifugal force to stream along the inside of the centrifugal disk and cover towards their peripheries.
  • the purpose of the present invention is to eliminate the above problem. This objective is achieved by a centrifugal rotor of the kind stated in the claims, wherein it will also be evident what in particular is characteristic of the invention.
  • the centrifugal disk 1 consists of an essentially plane, circular base 2 and a circumferential flange 3 projecting essentially perpendicular from the base 2. The free, upper edge of the flange 3 is folded at 4, thus extending over base 2.
  • a tube carrier 5 in the form of a ring-like tray is positioned on the base 2 concentrically around a hub 7, which is adapted to be positioned on the output shaft proper of the centrifugal machine.
  • the tube carrier 5 is preferably made of cellular plastic and has radial, regularly spaced grooves in which the hematocrit tubes 9 are placeable.
  • the cover 10 shown in Fig. 2 reminds us of a conventional pan lid and has a central fastening bolt 11, a plane portion 12 extending around said bolt and which plane portion is designed at the circumferential edge as a step with a portion 13, which is axially projecting from said plane portion 12, and a portion 14, which continues again radially projecting from said portion 13.
  • the axial portion 13 is adapted to fit inside of the folded-back portion of the centrifugal disk 1, and the radial portion 14 is adapted to rest against the outside of the folded-back portion 4.
  • FIG. 3 there is shown a preferred, alternative embodiment of the circumferential edge of the cover 10, where the radial portion 14 is continued at its free edge by a downwardly folded flange 15, which is adapted to fit around the circumferential flange 3 of the centrifugal disk 1.
  • the bottom 2 of the disk 1 is inclined outwardly and upwardly from the hub 7 approximately 1-2 degrees.
  • a circular step 16 in the shown embodiment, radially outside of which step the bottom forms an angular surface 17 situated above the bottom surface 2 but in a plane parallel to said bottom surface.
  • This step is an indicator of the position of the tube carrier or insert 5, which retains the tubes 9 during centrifugation.
  • this tube carrier 5 is made of a cellular plastic material, which insulates against the heat that tends to emerge from the centrifugal machine positioned under the disk.
  • the circumferential flange 3 projects perpendicular from the slightly angled bottom 2, which means that the edge 20 between the ring-shaped surface 17 and the circumferential flange 3 will lie as a circular ring having the largest distance from the rotary centre, that is the hub 7, of any part of the disk 1.
  • the tubes 9 are retained in the carrier 5 parallel with the bottom 2, and since the circumferential flange 3 is perpendicular to the bottom 2, the ends of the tubes 9 being barred perpendicularly will steadily rest against this inside of the flange.
  • a plug of putty of wax is inserted into the tubes.
  • As an extra security there is a flexible ring 21 positioned against the inside of the flange 3, against which the tube ends are pressed during centrifugation.

Landscapes

  • Centrifugal Separators (AREA)
EP86850144A 1985-04-22 1986-04-21 Laborzentrifuge Withdrawn EP0199696A3 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
SE8501947 1985-04-22
SE8501947A SE8501947L (sv) 1985-04-22 1985-04-22 Laboratoriecentrifug

Publications (2)

Publication Number Publication Date
EP0199696A2 true EP0199696A2 (de) 1986-10-29
EP0199696A3 EP0199696A3 (de) 1988-03-23

Family

ID=20359931

Family Applications (1)

Application Number Title Priority Date Filing Date
EP86850144A Withdrawn EP0199696A3 (de) 1985-04-22 1986-04-21 Laborzentrifuge

Country Status (2)

Country Link
EP (1) EP0199696A3 (de)
SE (1) SE8501947L (de)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1993002801A1 (en) * 1991-08-03 1993-02-18 Laurence Roy Rickman Centrifuge rotor
WO1998026875A1 (de) * 1996-12-17 1998-06-25 Firma Andreas Hettich Hämatokrit-zentrifuge
WO2023203315A1 (en) * 2022-04-20 2023-10-26 Entia Limited Apparatus for centrifuging

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3009388A (en) * 1957-12-30 1961-11-21 American Optical Corp Apparatus for determining fluid fractions and sedimentataion rates
US4052165A (en) * 1975-11-26 1977-10-04 Compur-Electronic Gesellschaft Mit Beschrankter Haftung Apparatus for centrifugal separation of test samples
US4484906A (en) * 1983-05-02 1984-11-27 Beckman Instruments, Inc. Shell type centrifuge rotor retaining ruptured tube sample

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1993002801A1 (en) * 1991-08-03 1993-02-18 Laurence Roy Rickman Centrifuge rotor
GB2273449A (en) * 1991-08-03 1994-06-22 Laurence Roy Rickman Centrifuge rotor
GB2273449B (en) * 1991-08-03 1995-01-04 Laurence Roy Rickman Centrifuge rotor
WO1998026875A1 (de) * 1996-12-17 1998-06-25 Firma Andreas Hettich Hämatokrit-zentrifuge
WO2023203315A1 (en) * 2022-04-20 2023-10-26 Entia Limited Apparatus for centrifuging

Also Published As

Publication number Publication date
SE8501947L (sv) 1986-10-23
EP0199696A3 (de) 1988-03-23
SE8501947D0 (sv) 1985-04-22

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Inventor name: WAHL, INGEMAR