EP0985453B1 - Zentrifugenkammer für einen Zellseparator - Google Patents
Zentrifugenkammer für einen Zellseparator Download PDFInfo
- Publication number
- EP0985453B1 EP0985453B1 EP99117393A EP99117393A EP0985453B1 EP 0985453 B1 EP0985453 B1 EP 0985453B1 EP 99117393 A EP99117393 A EP 99117393A EP 99117393 A EP99117393 A EP 99117393A EP 0985453 B1 EP0985453 B1 EP 0985453B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- channel
- centrifuge chamber
- radially
- chamber according
- separation
- 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.)
- Expired - Lifetime
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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
- B04B5/0442—Radial chamber apparatus for separating predominantly liquid mixtures, e.g. butyrometers with means for adding or withdrawing liquid substances during the centrifugation, e.g. continuous centrifugation
-
- 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
- B04B5/0442—Radial chamber apparatus for separating predominantly liquid mixtures, e.g. butyrometers with means for adding or withdrawing liquid substances during the centrifugation, e.g. continuous centrifugation
- B04B2005/045—Radial chamber apparatus for separating predominantly liquid mixtures, e.g. butyrometers with means for adding or withdrawing liquid substances during the centrifugation, e.g. continuous centrifugation having annular separation channels
Definitions
- the invention relates to a centrifuge chamber for a cell separator, in particular for the separation of blood into several fractions.
- the centrifuge chamber of the known cell separators has a Separation channel, in which the cell suspension to be separated is passed. Under the influence of the centrifugal force takes place in the separation channel a Separation into different fractions, for example platelets (PLT), Erythrocytes (RBC), platelet rich plasma (PRP) and platelet-poor plasma (PPP) withdrawn from the chamber.
- PLT platelets
- RBC Erythrocytes
- PRP platelet rich plasma
- PPP platelet-poor plasma
- the centrifuge chamber of known cell separators for separating blood into multiple fractions is generally for single use certainly.
- the separation channel of the known one or two-part Centrifuge chambers is formed in one or more stages.
- Centrifuge chambers with multi-stage separation channel have the disadvantage that by turbulence in the transition region between the individual Channel sections already entrained separate cells in another fraction can be. For example, there is a risk that already separate Platelets partially or completely mixed with the plasma or Leukocytes are raised as an impurity.
- Single-stage separation chambers are characterized by unclean ones or insufficient separation especially of platelets, since here the Platelets are obtained from the so-called buffy coat, the naturally heavily contaminated with leukocytes.
- DE-A-28 21 055 describes a multi-stage centrifuge chamber for Separating blood into several fractions whose separation channel consists of several circular arc sections with different radii, the clearly separated from each other by transition areas or dams.
- the Sections of the channel differ significantly in their slope, with the Slope of the channel section at the transition point to the itself subsequent section has a break point.
- a centrifuge chamber whose separation channel consists of several sections is also known from US-A-4,342,420.
- Of the Separation channel has an outgoing input area, one on a circular path about the axis of rotation extending central region and an on the rotation axis tapered end.
- US-A-4 356 958 discloses a single-stage separation chamber having a spiral separation channel.
- the separation channel is designed such that it does not run to the axis of rotation of the chamber, but in the Edge region of the chamber leaking.
- US 4,479,790 describes a centrifuge chamber with a Separation channel, of a radially inner and a radially outer lying side wall is limited.
- the course of the separation channel is from a spiral described from the radially outer end of the channel with increasing slope to the radially inner end of the channel extends.
- the known Zenirifugenhunt is not one Centrifuge chamber for a cell separator, but a centrifuge chamber for Separation of heavy minerals from less dense materials. Consequently, has the chamber also does not have an inlet for a cell suspension to be separated between the radially inner and the radially outer end of Channel.
- the invention has for its object to provide a centrifuge chamber for a To create a cell separator in which the separation of the cell suspension is very evenly and without contamination takes place.
- the separation channel may consist of one or more channel sections be composed, with between the individual channel sections Are areas where liquid supplied to the separation chamber or Liquid is discharged. In these areas, the interior and Outside wall of the separation channel naturally have no steady course.
- the centrifuge chamber according to the invention finds in particular for separation of whole blood into several fractions, namely erythrocytes and / or Platelets and / or plasma use.
- the separation channel extends up close to the center of the axis of rotation of the centrifuge chamber.
- the centrifuge chamber is the Outlet for the erythrocyte fraction at the radially outer end of the Channel, while the outlet for the plasma fraction at the radial located inside the end of the channel.
- the inlet for the too separating cell suspension is preferably between the outlet for the Erythrocyte fraction and the outlet for the plasma fraction arranged.
- the outlet for the platelet fraction is preferably between the inlet for blood and the outlet for the plasma fraction.
- the progressive slope of the canal is achieved that Erythrczyten in the radially outer regions of the Channels are not packed too compactly.
- the hematocrit value of Erythrocytes can therefore in the radially outer areas a Do not exceed the maximum value of 80 to 90% Hct. This is so far from Advantage, as high hematocrit values in the outer areas of the channel radially inward flow of platelets into the plasma with special needs. In addition, it ensures that plasma unhindered over the Whole length of the channel can flow radially inward to the plasma outlet.
- platelets may be located further inward due to centrifugal force Back areas of the channel to the platelet outlet.
- the outlet for the Platelets in a spread over the entire height of the separation channel extending recess on the radially outer side wall of the channel arranged, from which the platelets peel off with great effectiveness to let.
- both the platelets which through the Plasma flow from the buffy coat layer on the erythrocytes to the Plasma outlet be entrained as well as the platelets by the progressive increase of the channel from radially inner areas fall back and get into the depression.
- the outlet for the platelets is advantageously located in the lower half of the recess, preferably in the radially outer part of the Deepening.
- the separation channel with the erythrocyte outlet at the radially outside lying and the plasma outlet at the radially inner end can be When prefilling with solutions or bleeding blood slightly, because the air bubbles under the influence of the centrifugal force to the radially inner end be driven where it is removed without residue by the plasma outlet can be.
- the cross section of the separation channel is over the entire length preferably constant. But it is also possible to use a separation channel to provide a continuously changing in the longitudinal direction cross-section.
- the centrifuge chamber may be formed as a one-piece chamber, wherein the centrifuge channel is part of the housing body. It is also possible to form the centrifuge chamber in two parts, wherein the Separation channel as a flexible channel of hose or foil material in the Housing body is used.
- the centrifuge chamber comprises a circular housing body 1, which in the cell separator is inserted.
- the cell separator rotates in the cell separator Housing body 1 about a vertical axis of rotation 2.
- the housing body. 1 carries a separation channel 3, which surrounds the axis of rotation 2 of the Centrifuge chamber extends.
- the separation channel has at its outer end 4 a first Erythrocyte outlet 5 (RWC) and at its inner end 6 a second outlet 7 for plasma (PLS). Between the erythrocyte outlet 5 and the plasma outlet 7, the separation channel 3 has an inlet 8 for the to be separated whole blood (WB), while between the whole blood inlet 8th and the plasma outlet 7, a third outlet 9 for platelets (PLT) is arranged.
- the inlet and the outlets are in the length of the channel in the essentially arranged distributed at equal intervals.
- the separation channel 3 has the same cross section along its length. He is from an inner side wall 10 and an outer side Side wall 11 and a lower wall 12 and an upper wall thirteenth limited (Figure 3).
- the course of the separation channel 3 is by a midway between the Side walls 10, 11 extending line described in the form of a Spiral S around the axis of rotation 2 of the centrifuge chamber winds and on the Rotation axis tapers.
- the slope of the spiral S describing the course of the rotation channel takes from the outside channel end 4 to the inside channel end 6 towards steadily, with the slope defined at one point on the spiral as the angle between the tangent of a circle around the rotation axis in this point and the tangent of the spiral in this point.
- FIG 3 is a point on the course of the separation channel descriptive spiral S denoted by A.
- the slope at the point A is now defined as the angle ⁇ between the Tangent T1 of the circle K in the point A and the tangent T2 of the spiral S, which describes the course of the channel, in the point A.
- the course of the channel descriptive spiral S has starting from the outer channel end 4 over substantially the first half of its length a pitch that is less than 5 ° and in the second half greater than 5 ° is.
- the slope parameter y is less than 1500.
- the whole blood inlet 8 is preferably located at a location of the canal the slope is less than 1 °, while the platelet outlet 9 preferably located at a location of the channel at which the slope is greater than 5 ° is.
- FIG. 4 shows a section through the separation channel 3 at the height of the Platelet outlet 9. Here runs the outer side wall 11 below Forming a recess 15 radially outward, then again radially to to run inside. At the bottom of the recess is in the outer Side wall of the thrombocyte outlet 9 is arranged.
- the recess 15 over the entire channel height is formed such that they the channel cross section strömuntgslite not significantly changed and the Flow laminar flows over the trigger.
- the outer wall of the outside Section of the separation channel goes into an obliquely outward Wall over which an obliquely inward-running wall connects, which then merges into the radially inner channel section.
- Of the Discharge port for the platelets is located at the point of Separation channel where the two walls meet.
- the slope parameter y1 is less than 1500 and the slope parameter y2 is less than 10, where phi1 / phi0 is greater than 0.3.
- the channel can have an angular circumference of> 360 °.
- Figure 7 shows the course of the separation channel 3, the 270 ° over a very has low slope, which then progressively grows to 540 °.
- a Separation chamber with such a channel is suitable, a very to gain platelet-rich plasma. This will be on the radially inside lowest point.
Description
- Figur 1
- eine Zentrifugenkammer in schematischer Darstellung,
- Figur 2
- den Verlauf des Separationskanals der Zentrifugenkammer von Figur 1,
- Figur 3
- einen Schnitt durch den Separationskanal von Figur 1 entlang der Linie III-III von Figur 1 in vergrößerter Darstellung,
- Figur 4
- einen Schnitt durch den Separationskanal von Figur 1 entlang der Linie IV-IV in vergrößerter Darstellung und
- Figuren 5 bis 7
- den Verlauf des Separationskanals weiterer Ausführungsbeispiele der Zentrifugenkammer.
- R =
- radialer Abstand der den Verlauf des Kanals beschreibenden Spirale S an der Stelle phi
- R0 =
- radial größter Abstand der den Verlauf des Kanals beschreibenden Spirale S am außenliegenden Kanalanfang
- phi =
- Winkel des betrachteten Kanalpunktes
- phi0 =
- Gesamtwinkel des Kanals
- y =
- Steigungsparameter
- R =
- radialer Abstand der den Verlauf des Separationskanals beschreibenden Spirale an der Stelle phi
- R0 =
- radial größter Kanalabstand am außen liegenden Kanalanfang
- phi =
- Winkel des betrachteten Kanalpunktes
- phi0 =
- Gesamtwinkel des Kanals
- phi1 =
- Winkelparameter
- y1 =
- Steigungsparameter 1
- y2 =
- Steigungsparameter 2
- R0 =
- radial größter Kanalbastand
- phi1 =
- Winkelparameter 1
- y2 =
- Steigungsparmeter 2
- y1 =
- Kreisabweichung bei phi1
- phi0 =
- Gesamtwinkel
- y3 =
- Steilheit
- phi3 =
- Progressivabschnitt
- phi =
- Winkel des betrachteten Kanalpunktes
Claims (11)
- Zentrifugenkammer für einen Zellseparator mit einem Separationskanal (3), der sich aus mindestens einem Kanalabschnitt zusammensetzt, der von einer radial innen liegenden und einer radial außen liegenden Seitenwand (10, 11) begrenzt wird und der einen Einlaß (8) für die zu separierende Zellsuspension, insbesondere Blut, und mindestens einen Auslaß (5) für eine Fraktion der Zellsuspension aufweist, wobei der Verlauf des bzw. jedes Kanalabschnitts durch eine in der Mitte zwischen den Seitenwänden verlaufende Linie beschrieben wird, die sich um die Rotationsachse (2) der Zentrifugenkammer windet,
dadurch gekennzeichnet, daß die den Verlauf des bzw. jedes Kanalabschnitts des Separationskanals (3) beschreibende Linie eine Spirale (S) ist, die sich von dem radial außen liegenden Kanalende (4) mit zunehmender Steigung zu dem radial innen liegenden Kanalende (6) erstreckt, wobei die Steigung an einem Punkt (A) auf der Spirale definiert ist als der Winkel α zwischen der Tangente (T1) eines Kreises (K) um die Rotationsachse (2) in diesem Punkt und der Tangente (T2) der Spirale in diesem Punkt. - Zentrifugenkammer nach Anspruch 1, dadurch gekennzeichnet, daß die den Verlauf eines radial außen liegenden Kanalabschnitts eines sich aus mehreren Kanalabschnitten zusammensetzenden Separationskanals (3) beschreibende Linie (S) an jedem Punkt der Linie eine Steigung hat, die kleiner als die Steigung an jedem Punkt eines sich an den radial außen liegenden Kanalabschnitt anschließenden Kanalabschnitts ist, der radial innen liegt.
- Zentrifugenkammer nach Anspruch 1 oder 2, dadurch gekennzeichnet, daß sich der Separationskanal bis nahe an die Rotationsachse (2) der Zentrifugenkammer erstreckt.
- Zentrifugenkammer nach einem der Ansprüche 1 bis 3, dadurch gekennzeichnet, daß der Auslaß (5) für eine Fraktion der Zellsuspension, insbesondere die Erythrozytenfraktion, an dem radial außen liegenden Ende (4) des Kanals (3) angeordnet ist.
- Zentrifugenkammer nach einem der Ansprüche 1 bis 4, dadurch gekennzeichnet, daß ein zweiter Auslaß (7) für eine zweite Fraktion der Zellsuspension, insbesondere die Plasmafraktion, an dem radial innen liegenden Ende (6) des Kanals (3) angeordnet ist.
- Zentrifugenkammer nach einem der Ansprüche 1 bis 5, dadurch gekennzeichnet, daß der Einlaß (8) für die zu separierende Zellsuspension, insbesondere Blut, zwischen dem radial innnen liegenden und radial außen liegenden Ende (6, 4) des Kanals (3) angeordnet ist.
- Zentrifugenkammer nach Anspruch 6, dadurch gekennzeichnet, daß ein dritter Auslaß (9) für eine dritte Fraktion der Zellsuspension, insbesondere die Thrombozytenfraktion, zwischen dem Einlaß (8) und dem radial innen liegenden Ende (6) des Kanals (3) angeordnet ist.
- Zentrifugenkammer nach Anspruch 7, dadurch gekennzeichnet, daß der dritte Auslaß (9) für die dritte Zellsuspension, insbesondere die Thrombozytenfraktion, in einer sich im wesentlichen über die gesamte Höhe des Kanals erstreckenden Vertiefung (15) an der radial außen liegenden Seitenwand (11) des Separationskanals (3) angeordnet ist.
- Zentrifugenkammer nach einem der Ansprüche 1 bis 8, dadurch gekennzeichnet, daß der Einlaß (8) und die Auslässe (5, 7, 9) über die Länge des Separationskanals (3) im wesentlichen in gleichbleibenden Abständen verteilt angeordnet sind.
- Zentrifugenkammer nach einem der Ansprüche 1 bis 9, dadurch gekennzeichnet, daß die den Verlauf des Separationskanals (3) beschreibende Spirale (S) ausgehend von dem außen liegenden Ende (4) des Kanals (3) über im wesentlichen die erste Hälfte ihrer Länge eine Steigung aufweist, die kleiner als 5° und in der zweiten Hälfte größer als 5° ist.
- Zentrifugenkammer nach einem der Ansprüche 1 bis 10, dadurch gekennzeichnet, daß der Querschnitt des Separationskanals (3) über die gesamte Länge konstant ist.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE19841835A DE19841835C2 (de) | 1998-09-12 | 1998-09-12 | Zentrifugenkammer für einen Zellseparator |
DE19841835 | 1998-09-12 |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0985453A1 EP0985453A1 (de) | 2000-03-15 |
EP0985453B1 true EP0985453B1 (de) | 2005-11-23 |
Family
ID=7880779
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP99117393A Expired - Lifetime EP0985453B1 (de) | 1998-09-12 | 1999-09-04 | Zentrifugenkammer für einen Zellseparator |
Country Status (5)
Country | Link |
---|---|
US (1) | US6277060B1 (de) |
EP (1) | EP0985453B1 (de) |
JP (1) | JP4027540B2 (de) |
DE (2) | DE19841835C2 (de) |
ES (1) | ES2248948T3 (de) |
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SE459791B (sv) * | 1986-05-16 | 1989-08-07 | Omega Medicinteknik Ab | Ringcentrifug |
SE454413B (sv) * | 1986-09-12 | 1988-05-02 | Alfa Laval Separation Ab | Centrifugalseparator med en rotor, vari ett bojligt organ strecker sig ett stycke lengs rotorns omkrets |
DE3632500A1 (de) * | 1986-09-24 | 1988-04-07 | Fresenius Ag | Zentrifugenanordnung |
DE4226974C2 (de) * | 1992-08-14 | 1994-08-11 | Fresenius Ag | Verfahren und Vorrichtung zur kontinuierlichen Aufbereitung einer Zellsuspension |
US5904645A (en) * | 1996-05-15 | 1999-05-18 | Cobe Laboratories | Apparatus for reducing turbulence in fluid flow |
-
1998
- 1998-09-12 DE DE19841835A patent/DE19841835C2/de not_active Expired - Fee Related
-
1999
- 1999-09-04 DE DE59912818T patent/DE59912818D1/de not_active Expired - Lifetime
- 1999-09-04 EP EP99117393A patent/EP0985453B1/de not_active Expired - Lifetime
- 1999-09-04 ES ES99117393T patent/ES2248948T3/es not_active Expired - Lifetime
- 1999-09-10 JP JP25674799A patent/JP4027540B2/ja not_active Expired - Fee Related
- 1999-09-10 US US09/394,574 patent/US6277060B1/en not_active Expired - Lifetime
Also Published As
Publication number | Publication date |
---|---|
US6277060B1 (en) | 2001-08-21 |
DE59912818D1 (de) | 2005-12-29 |
DE19841835C2 (de) | 2003-05-28 |
DE19841835A1 (de) | 2000-03-23 |
ES2248948T3 (es) | 2006-03-16 |
JP4027540B2 (ja) | 2007-12-26 |
EP0985453A1 (de) | 2000-03-15 |
JP2000093506A (ja) | 2000-04-04 |
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