Bowl And Means External Thereof For Recirculating Material Patents (Class 494/35)
  • Patent number: 10335533
    Abstract: The invention relates to a device for separating blood into its components and a method for the same and use of such a device. The device comprises a magnetic drive device, which causes a container to rotate about its own axis, wherein the container has at least one open end and at least one inlet therein and is suspended in a magnetically floating manner.
    Type: Grant
    Filed: January 22, 2015
    Date of Patent: July 2, 2019
    Assignee: FRESENIUS MEDICAL CARE DEUTSCHLAND GMBH
    Inventor: Alexander Heide
  • Patent number: 8951180
    Abstract: The invention refers to a centrifuge for separating whole blood into its blood components and a method for extracting a highly enriched thrombocyte concentrate out of whole blood. For this purpose, the centrifuge comprises a closed loop and/or open-loop control unit as well as a drive unit coupled to the closed loop and/or open-loop control unit, a rotor (12) having at least two container receptacles (14a, 14b; 16a, 16) for removably holding containers (18, 20, 22, 24) being in fluid communication with each other, at least one sensor arranged between the container receptacles (14a, 14b; 16a, 16b) and coupled with the closed loop and/or open-loop control unit for detecting a separation layer. Herein, a motor/gear unit (30a, 30b, 32a, 32b) coupled to the closed loop and/or open-loop control unit is associated with each of the container receptacles (14a, 14b; 16a, 16b).
    Type: Grant
    Filed: September 3, 2010
    Date of Patent: February 10, 2015
    Assignee: Andreas Hettich GmbH & Co. KG
    Inventor: Klaus-G√ľnter Eberle
  • Publication number: 20140378290
    Abstract: A blood component separation device includes a centrifuge bowl for separating a blood component from blood, a plasma bag for storing a plasma component, a platelet intermediate bag for storing high-concentration platelet liquid having high-concentration of platelets, and a temporary storage bag (also used as a buffy coat bag) for storing low-concentration platelet liquid having low-concentration of platelets. The blood component separation device performs control, from the second cycle onward, to mix the low-concentration platelet liquid stored in the temporary storage bag in the immediately preceding cycle with whole blood to supply the mixed liquid to the centrifuge bowl. An amount of high-concentration platelet liquid to be collected in the platelet intermediate bag in the first cycle is set to be smallest among all cycles, and an amount of high-concentration platelet liquid to be collected in a last cycle is set to be greatest among all the cycles.
    Type: Application
    Filed: September 9, 2014
    Publication date: December 25, 2014
    Inventor: Shigeyuki KIMURA
  • Publication number: 20140221186
    Abstract: A centrifugal separator includes a separation barrel with an upper end, a lower end, a central axis, and a cylindrical wall defining a separation chamber. A spin plate extends substantially across the separation chamber adjacent to the lower end thereof. A post including a central passage extends from the spin plate along the central axis of the separation barrel. The post includes at least one opening for fluid to flow from the central passage of the post to the separation chamber. An inlet in fluid communication with the separation chamber allows solids-laden fluid to flow into the separation chamber. An outlet in fluid communication with the separation chamber allows substantially-clean fluid to flow out of the separation chamber and out of the device.
    Type: Application
    Filed: February 5, 2013
    Publication date: August 7, 2014
    Applicant: Claude Laval Corporation
    Inventors: Steven David Ford, Jeremy Benjamin Isch, Timothy Alan Raiskup
  • Publication number: 20130017943
    Abstract: A continuous centrifuge including: a rotor configured to separate a sample; a centrifuge chamber configured to accommodate the rotor; a driving part configured to rotate the rotor; a sample line configured to continuously supply and discharge the sample to and from the rotor during rotation of the rotor; and an air detecting sensor provided to a supply side and a discharge side of the sample line.
    Type: Application
    Filed: July 11, 2012
    Publication date: January 17, 2013
    Applicant: HITACHI KOKI CO., LTD.
    Inventors: Hiroatsu Toi, Eiichi Fukuhara
  • Patent number: 8337378
    Abstract: A continuous self-cleaning centrifuge assembly having a feed inlet for unclarified liquid and first and second outlets for clarified liquid. Solids are discharged out of a solids holding space in the centrifuge in response to comparison of a measured turbidity to a predetermined turbidity parameter of clarified liquid bled in a detection line in communication with the centrifuge at the second outlet. The turbidity is affected by the degree of build up of solids in the centrifuge. A method of optimizing the clarified liquid outflowing from the centrifuge includes the steps of controlling the flow rate of unclarified liquid into the centrifuge in response to the turbidity of the clarified liquid flowing out of the centrifuge and discharging solids out of a solids holding space in the centrifuge in response to the turbidity measurement.
    Type: Grant
    Filed: November 15, 2007
    Date of Patent: December 25, 2012
    Assignee: GEA Westfalia Separator GmbH
    Inventor: Chris Kwok On Chan
  • Patent number: 8075468
    Abstract: Blood separation methods are provided for mid-processing calculation of blood composition. Blood is conveyed into a device having an outlet line and the device is spun to separate platelets from the blood. A flow of platelets is conveyed from the device by the outlet line and the platelets in the outlet line are optically measured. With said optical measurement, a current platelet yield, a platelet pre-count, the volume of blood to process to collect a target amount of platelets, and/or the processing time required to collect a target amount of platelets is calculated. The optical measurement can also be used to calculate an amount of storage fluid to convey into a collection container with the platelets.
    Type: Grant
    Filed: February 27, 2009
    Date of Patent: December 13, 2011
    Assignee: Fenwal, Inc.
    Inventors: Kyungyoon Min, Richard I. Brown
  • Patent number: 7938874
    Abstract: A system and method for supplying clean dry gas to gas seals of a compressor. The system uses a rotary separator magnetically coupled to a source of rotational power, along with a gas stream cooling unit configured to condensate liquids out of a wet gas stream before the wet gas stream is supplied to the rotating separator. The system may further include a gas stream pressure booster, a heating unit to heat a dry gas stream generated by the rotary separator, and a controlled recirculation loop configured to continually recirculate the wet gas through the driven rotary separator until a desired amount of condensates are removed from the wet gas stream.
    Type: Grant
    Filed: December 5, 2008
    Date of Patent: May 10, 2011
    Assignee: Dresser-Rand Company
    Inventor: Philippe Auber
  • Patent number: 7708152
    Abstract: The PRP separator-concentrator of this invention is suitable for office use or emergency use for trauma victims. The PRP separator comprises a motorized centrifugal separation assembly, and a concentrator assembly. The centrifugal separator assembly comprises a centrifugal drum separator that includes an erythrocyte capture module and a motor having a drive axis connected to the centrifugal drum separator. The concentrator assembly comprises a water-removal module for preparing PRP concentrate. The centrifugal drum separator has an erythrocyte trap. The water removal module can be a syringe device with water absorbing beads or it can be a pump-hollow fiber cartridge assembly. The hollow fibers are membranes with pores that allow the flow of water through the fiber membrane while excluding flow of clotting factors useful for sealing and adhering tissue and growth factors helpful for healing while avoiding activation of platelets and disruption of any trace erythrocytes present in the PRP.
    Type: Grant
    Filed: January 30, 2006
    Date of Patent: May 4, 2010
    Assignees: Hanuman LLC, Biomet Biologics, LLC
    Inventors: Randel Dorian, Michael D. Leach
  • Patent number: 7527587
    Abstract: A centrifugal separator includes devices for light matter extraction and for heavy matter extraction. Each embodiment provides for a plurality, e.g., two or more stacked or layered chambers, and connected to a central compartment of the chambers is a rotating drive shaft. In the light matter extraction, a central conduit feeds fluid input into the lower chamber. An upper portion of the lower chamber communicates with the lower portion of a mid chamber via a port formed in a plate dividing the chambers. The upper portion of the mid chamber communicates with the lower portion of an upper chamber via a port formed in a plate dividing the chambers. The chambers can be fixably connected to one another. In the heavy matter extraction an initial feed conduit feeds fluid into the upper chamber.
    Type: Grant
    Filed: April 17, 2007
    Date of Patent: May 5, 2009
    Inventor: Henry J. Laughlin
  • Patent number: 7241392
    Abstract: A separator and method according to which substances having relatively high densities are separated from a pressurized flow stream.
    Type: Grant
    Filed: September 8, 2005
    Date of Patent: July 10, 2007
    Assignee: Dresser-Rand Company
    Inventor: William C. Maier
  • Patent number: 6814862
    Abstract: A method and an apparatus for continuous processing of intra- or postoperative blood loss for autotransfusion. According to the present invention, certain cells of the cell suspension to be processed, mainly the red blood cells, are concentrated by centrifuging in a separation unit and removed from the separation unit without being rinsed or washed in the separation unit. The concentrated cell fraction is diluted with a physiological solution, preferably a Ringer's solution, after being removed from the separation unit.
    Type: Grant
    Filed: August 6, 2001
    Date of Patent: November 9, 2004
    Assignee: Fresenius AG
    Inventor: Wolgang Biesel
  • Publication number: 20030232712
    Abstract: A centrifugal method, and corresponding system, for processing blood to collect platelet rich plasma. A separation chamber is filled with blood from a fill syringe by rotating the separation chamber at a fill rotation rate and pumping the blood from the fill syringe. A soft spin is used to initially separate red blood cells from platelets by spinning the separation chamber at a soft spin rate. A percentage of the blood is drawn from the separation chamber back into the fill syringe to remove separated red blood cells. A second portion of the separated blood is drawn from the separation chamber until a red blood cell/platelet interface is detected. A hard spin is performed by spinning the separation chamber at a higher rate and connecting tubing is cleared of red blood cells by drawing a predetermined clearing volume. The platelet rich plasma is then collected in the collection syringe.
    Type: Application
    Filed: January 10, 2003
    Publication date: December 18, 2003
    Inventors: Victor D. Dolecek, Gary L. Berg, Kenneth E. Merte, David Malcolm, Kevin D. McIntosh, Vitaly G. Sitko
  • Patent number: 6613009
    Abstract: An extracorporeal blood processing system is disclosed which includes a variety of novel components and which may be operated in accordance with a variety of novel methodologies. For instance, the system includes a graphical operator interface which directs the operator through various aspects of the apheresis procedure. Moreover, the system also includes a variety of features relating to loading a blood processing vessel into a blood processing channel and removing the same after completion of the procedure. Furthermore, the system also includes a variety of features relating to utilizing a blood priming of at least portions of the apheresis system in preparation for the procedure. In addition, the system includes a variety of features enhancing the performance of the apheresis system, including the interrelationship between the blood processing vessel and the blood processing vessel and the utilization of high packing factors for the procedure.
    Type: Grant
    Filed: August 19, 1997
    Date of Patent: September 2, 2003
    Assignee: Gambro, Inc.
    Inventors: Marlene Adele Bainbridge, Brian M. Holmes
  • Patent number: 6544162
    Abstract: A centrifugal blood separator for separating whole blood into at least two blood fractions such as a plasma fraction and a blood cell fraction is disclosed. The blood separator has a centrifuge vessel with a separation chamber having at least two sections with different diametric sizes. The large diameter section collects the heavier blood cell fraction during centrifugation. The smaller diameter section collects the lighter plasma fraction. Fluid communication subassemblies preferably have a feed conduit, a product or an outflow conduit and a vent which are mounted in a non-rotatable part and positioned in an extending or extendible manner into the separation chamber to allow blood fractions to be removed while the centrifuge vessel is rotating or after rotation has stopped depending upon specifics of the particular embodiment.
    Type: Grant
    Filed: February 8, 2000
    Date of Patent: April 8, 2003
    Assignees: Washington State University Research Foundation, DevTec Inc.
    Inventors: Bernard Van Wie, Trevan R. Landin, Bruce N. Weyrauch
  • Patent number: 6234989
    Abstract: An extracorporeal blood processing system is disclosed which includes a variety of novel components and which may be operated in accordance with a variety of novel methodologies. For instance, the system includes a graphical operator interface which directs the operator through various aspects of the apheresis procedure. Moreover, the system also includes a variety of features relating to loading a blood processing vessel into a blood processing channel and removing the same after completion of the procedure. Furthermore, the system also includes a variety of features relating to utilizing a blood priming of at least portions of the apheresis system in preparation for the procedure. In addition, the system includes a variety of features enhancing the performance of the apheresis system, including the interrelationship between the blood processing vessel and the blood processing vessel and the utilization of high packing factors for the procedure.
    Type: Grant
    Filed: April 28, 1998
    Date of Patent: May 22, 2001
    Assignee: Gambro, Inc.
    Inventors: Mark J. Brierton, Victor D. Dolecek, Leon E. Bilodeau, Russell Hempstead
  • Patent number: 5899844
    Abstract: A method and apparatus for controlling the density of the solids separated from a feed slurry by selectively recirculating the separated liquid component of the feed slurry to change the feed slurry's density when an unwanted density of the separated solids is detected. Further, the efficiency of the separation is increased by recirculating and recharging unused catalyst into the feed slurry where it is used to assist in the separation of the solids.
    Type: Grant
    Filed: June 23, 1997
    Date of Patent: May 4, 1999
    Inventor: Louis C. Eberle, Sr.
  • Patent number: 5865785
    Abstract: Blood processing systems and methods establish on line communication between a container and a source of blood containing leukocytes and platelets, such as a human donor. The systems and methods create a centrifugal field between the source of blood and the container that separates from the blood an unfinished suspension of platelets having a first physiologic characteristic different than the desired physiologic characteristic. The systems and methods pump the unfinished platelet suspension outside the centrifugal field through a finishing device. The finishing device changes the first physiologic characteristic to the desired physiological characteristic, thereby creating the finished platelet suspension. The systems and methods convey the finished platelet suspension from the finishing device directly into the container. The systems and methods function without interrupting the on line communication between the container and the source of blood.
    Type: Grant
    Filed: February 23, 1996
    Date of Patent: February 2, 1999
    Assignee: Baxter International Inc.
    Inventor: Daniel F. Bischof
  • Patent number: 5795317
    Abstract: An extracorporeal blood processing system is disclosed which includes a variety of novel components and which may be operated in accordance with a variety of novel methodologies. For instance, the system includes a graphical operator interface which directs the operator through various aspects of the apheresis procedure. Moreover, the system also includes a variety of features relating to loading a blood processing vessel into a blood processing channel and removing the same after completion of the procedure. Furthermore, the system also includes a variety of features relating to utilizing a blood priming of at least portions of the apheresis system in preparation for the procedure. In addition, the system includes a variety of features enhancing the performance of the apheresis system, including the interrelationship between the blood processing vessel and the blood processing vessel and the utilization of high packing factors for the procedure.
    Type: Grant
    Filed: June 7, 1995
    Date of Patent: August 18, 1998
    Assignee: Cobe Laboratories, Inc.
    Inventors: Mark J. Brierton, Victor D. Dolecek, Leon E. Bilodeau, Russell Hempstead
  • Patent number: 5738784
    Abstract: A method and a device for separating a component, such as fibrin monomer from blood, by centrifugation, involve feeding of blood admixed an anticoagulant to a first annular chamber in a device, where the annular chamber is defined by a cylindrical outer wall and a cylindrical inner wall, both walls extending coaxially about a common axis, as well as by a top wall and a bottom wall. The top wall or the bottom wall is formed by a piston body displaceable within the first chamber. This method involves furthermore a centrifugation of the device about the said common axis to substantially separate blood into a cell fraction and a plasma fraction followed by the resulting plasma fraction being transferred while influenced by the piston body to a second chamber defined by an outer cylindrical wall. The outer cylindrical wall extends coaxially with the said common axis, whereby a fraction with fibrin I is caused to be separated in the second chamber while a suitable enzyme is being added.
    Type: Grant
    Filed: December 1, 1995
    Date of Patent: April 14, 1998
    Assignee: E.R. Squibb & Sons, Inc.
    Inventors: Niels Erik Holm, Peter A. D. Edwardson
  • Patent number: 5607579
    Abstract: An apheresis apparatus for increasing the purity and yield of platelets separated from donated whole blood by centrifugation incorporates a centrifuge for separating whole blood into lower, intermediate, and higher density components. The centrifuge has inlet and outlet ports in selective fluid communication with a container for receiving lower density blood component from the outlet port. A pump is coupled to the container and the inlet port for recirculating lower density blood component from the first container through the inlet port into the centrifuge at a first, substantially constant, rate so as to widen the region of the centrifuge occupied by the intermediate density component without causing the intermediate density component to exit the centrifuge, and subsequently at a second rate, so as to displace intermediate density component from the centrifuge.
    Type: Grant
    Filed: September 28, 1995
    Date of Patent: March 4, 1997
    Assignee: Haemonetics Corporation
    Inventors: Allen Latham, Jr., Glen E. Jorgensen, Theodoor H. S. Sibinga, Joseph R. Plante, Tracey E. Knapp
  • Patent number: 5601523
    Abstract: A centrifuge bowl is used for separating particulate materials of different specific gravity and has a first generally frusto-conical portion of the peripheral wall of the bowl over which the materials are caused to flow, and two axially spaced annular recesses downstream of the first portion and prior to an open mouth of the bowl. The feed materials pass over the peripheral wall causing heavier material to collect within the recesses and the lighter material to discharge through the open mouth. Each recess has a series of angularly spaced discharge ports controlled by pulsed valves. In front of each discharge port is provided a spherical body which directs the material to all sides around the body as it moves towards the discharge port in a generally conical shape. The conical shapes of adjacent discharge ports overlap to provide full discharge of all the material. The first recess acts as a main concentrate collector.
    Type: Grant
    Filed: July 13, 1995
    Date of Patent: February 11, 1997
    Inventor: Benjamin V. Knelson
  • Patent number: 5487720
    Abstract: Upper and lower bowl members are mounted on a common linear cylindrical member and a relief valve provides controlled gas pressure within a centrifuge housing in a low speed decanting centrifuge for separating relatively large particulate material (e.g. yeast) from a feedstock. The centrifuge may be clamped to a container and a pressure differential is created between the centrifuge housing and the container to, in turn, force feedstock upwardly into the lower bowl of the centrifuge. A stack of frustonconical discs carry supernatant downwardly and inwardly for vertical transfer to a discharge chamber, Particulate matter is centrifugally discharged continuously between engageable surfaces of the lower bowl member and the upper bowl member. Hydraulic forces generated within the bowl are isolated from a thrust bearing supporting the bowl and transferring drive forces to an intake.
    Type: Grant
    Filed: March 28, 1994
    Date of Patent: January 30, 1996
    Assignee: Occam Marine Technologies Ltd.
    Inventor: Dan R. Pace
  • Patent number: 5484282
    Abstract: A separator including a full-casing centrifuge and detachably mounted settler tank for solids which run off under action of gravity after centrifuge phase. An inlet for mixture to be separated is located in top of settler tank. A pump with suction tube which extends into settler tank is connected by a line to centrifuge inlet port and conveys all liquid arising, from which at least great particles have already settled out into centrifuge.
    Type: Grant
    Filed: October 8, 1993
    Date of Patent: January 16, 1996
    Inventors: Werner Trawoger, Bruno Pregenzer
  • Patent number: 5368542
    Abstract: An apparatus and method for the separation of a predetermined type of microscopic unit (e.g., islets of Langerhans) from a given medium (e.g., pancreatic digest) by centrifuging in a substantially continuous density gradient. In one embodiment, a substantially continuous density gradient solution is provided to a flexible processing bag appropriately positioned within an upper chamber of a rotating variable volume centrifuge. The solution having a plurality of the desired microscopic units therein is loaded onto the gradient and such units migrate to a particular radial position within the gradient based upon the density of such units. Once appropriately separated by the formation of regions, a fluid is provided to a lower chamber of the centrifuge bowl during continued rotation thereof to sequentially remove fractions from the processing bag from an inward location to an outward location, at least one of which fractions includes the band of the desired microscopic units.
    Type: Grant
    Filed: January 12, 1994
    Date of Patent: November 29, 1994
    Assignee: Cobe Laboratories, Inc.
    Inventors: John D. McMannis, Nicholas London
  • Patent number: 5316540
    Abstract: An apparatus and method for the separation of a predetermined type of microscopic unit (e.g., islets of Langerhans) from a given medium (e.g., pancreatic digest) by centrifuging in a substantially continuous density gradient. In one embodiment, a substantially continuous density gradient solution is provided to a flexible processing bag appropriately positioned within an upper chamber of a rotating variable volume centrifuge. The solution having a plurality of the desired microscopic units therein is loaded onto the gradient and such units migrate to a particular radial position within the gradient based upon the density of such units. Once appropriately separated by the formation of regions, a fluid is provided to a lower chamber of the centrifuge bowl during continued rotation thereof to sequentially remove fractions from the processing bag from an inward location to an outward location, at least one of which fractions includes the band of the desired microscopic units.
    Type: Grant
    Filed: January 13, 1993
    Date of Patent: May 31, 1994
    Assignee: Cobe Laboratories
    Inventors: John D. McMannis, Nicholas London
  • Patent number: 5300014
    Abstract: In a centrifuge for the separation of solids from liquid in which concentrated solids are discharged from radial nozzles at the periphery, there is provided an concentrated solids underflow discharge control apparatus which senses an increased concentration of solids in the underflow and adjusts the flow of the recycle stream as a result thereof to prevent solids from spilling over into the effluent overflow. A sensing chamber and a control module having a flow interference device is utilized to measure a set level backup. Any alteration of said level is detected by a level sensor which sends a signal to a level indicator control and in turn controls the opening and closing of a recycle line valve which controls underflow.
    Type: Grant
    Filed: October 16, 1992
    Date of Patent: April 5, 1994
    Assignee: Dorr-Oliver Corporation
    Inventors: Milton Chin, Chie-Ying Lee, Robert D. Mensinger
  • Patent number: 5300013
    Abstract: A method of processing a highly viscous material comprises the steps of spinning the material in a homogenizer to reduce it to a creamy fluent consistency, flowing the creamy material wholly by gravity down into an upper centrifuge stage, centrifuging the creamy material in the upper centrifuge stage into a solids fraction and a liquid fraction, flowing the solids fraction wholly by gravity down into a lower centrifuge stage, and centrifuging the solids fraction in the lower centrifuge stage. These steps can all take continuously with the material being fed in at one end and the solid and liquid fractions obtained at the opposite lower end. Prior to spinning the material a liquid is added to it to reduce its viscosity and increase its homogeneity. This liquid can be the recirculated liquid fraction obtained in the first centrifuge stage. In accordance with this invention the recirculated liquid fraction is heated to 40.degree. C. to 70.degree. C. before introducing it into the homogenizer.
    Type: Grant
    Filed: October 4, 1990
    Date of Patent: April 5, 1994
    Assignee: Dorr-Oliver Deutschland GmbH
    Inventors: Dieter Frassdorf, Paul H. Franzen
  • Patent number: 5267936
    Abstract: Multi-Stage centrifugal extractors for separating two liquids of differing densities wherein each stage includes a decantation chamber which surrounds and receives liquids from a mixing chamber and wherein a portion of at least one of the separated liquids is recycled from the decantation chamber to the mixing chamber at each stage.
    Type: Grant
    Filed: April 8, 1992
    Date of Patent: December 7, 1993
    Assignee: Societe Robatel
    Inventor: Jean-Paul A. Miachon
  • Patent number: 5254075
    Abstract: A centrifugal extractor for making liquid-liquid extraction by bringing an organic phase and an aqueous phase into mutual contact and utilizing centrifugal force. A rotor rotating at a high speed is disposed inside a cylindrical casing having inlets for both phases. Draw ports for both phases are disposed at an upper portion of the rotor. An organic phase/aqueous phase mixture mixed at the bottom of the casing enters the rotor from the bottom of the rotor, and is subjected to phase separation by centrifugal force. The separated phases are withdrawn from respective draw ports. Part of the organic phase discharged from the organic phase draw port is refluxed to the bottom of the casing by a reflux cover fitted to the upper part of the rotor. The flow rate of the organic phase thus refluxed is added to the flow rate of the organic phase introduced from outside into the casing.
    Type: Grant
    Filed: December 2, 1991
    Date of Patent: October 19, 1993
    Assignee: Doryokuro Kakunenryo Kaihatsu Jigyodan
    Inventors: Shin-ichi Nemoto, Ryo Shimizu, Hiroshi Takeda, Tomio Kawata
  • Patent number: 5199938
    Abstract: A centrifuge drum for concentrating suspended solids, which are conveyed through channels out of an outer solids space in the drum and into a radially inner peeling chamber, whence they are diverted by a peeler and by an associated concentrate line. A separated clear phase is continuously extracted from the interior of the drum by another peeler and by an associated clear-phase line. The object is to prevent the concentrated solids from heating up undesirably even when their volume is small. There is an opening-and-closing communicating line between the concentrate line and the clear-phase line and an opening-and-closing recirculation line extending into the first peeling chamber from the clear-phase line. The communicating line and the recirculation line are closed to divert the solids and opened to discontinue the diversion.
    Type: Grant
    Filed: October 31, 1991
    Date of Patent: April 6, 1993
    Assignee: Westfalia Separator AG
    Inventors: Werner Kohlstette, Aloys Bokamp, Friedhelm Siegmann
  • Patent number: 5141486
    Abstract: Red blood cells being salvaged are centrifuged into a liquid layer, mixed with a wash solution, and thereafter separated therefrom.
    Type: Grant
    Filed: November 5, 1990
    Date of Patent: August 25, 1992
    Assignee: Cobe Laboratories, Inc.
    Inventor: Glen D. Antwiler
  • Patent number: 5053127
    Abstract: A system for continuously esparating lighter and intermediate density matter, such as plasma rich in platelets from whole blood moves blood through a diverging centrifugation gap between inner and outer walls of a rotor rotating about a central axis within an outer housing. The centrifugation action creates layered flow along an intermediate section. However by crating trailing wakes in the gap between the rotor and housing, localized remixing patterns tending to move in the opposite direction are induced in the layered matter. Platelet rich plasma may then be extracted through adjacent platelet concentrate ports on the inner wall of the rotor. An interior passageway system passes the platelet rich plasma to a platelet concentrate reservoir. Recirculation of blood in the rotor-housing gap between the output and input, and pumping action provided by the diverging centrifugation gap, aid in enhancing throughput and concentration levels.
    Type: Grant
    Filed: May 21, 1990
    Date of Patent: October 1, 1991
    Assignee: William F. McLaughlin
    Inventors: Donald W. Schoendorfer, Claude E. Berthe
  • Patent number: 4973299
    Abstract: A liguid separation system includes a first separator unit, a second separator unit and means including a pump for flowing a liquid mixture from a system inlet to the inlet of the first separator unit. A first outlet of the first separator unit is connected to the inlet of the second separator unit, a second outlet of said second separator unit is connected to the inlet of the first separator unit, a first outlet of the second separator unit is connected to a system outlet, and feedback means is adapted to provide continuous flow during system operation of at least about 0.01 gallon per minute from a second outlet of the second separator unit to the inlet of the first separator unit.
    Type: Grant
    Filed: August 18, 1989
    Date of Patent: November 27, 1990
    Assignee: Foster-Miller, Inc.
    Inventors: Leslie S. Rubin, Andrew C. Harvey
  • Patent number: 4944883
    Abstract: A system for continuously separating lighter and intermediate density matter, such as plasma rich in platelets from whole blood moves blood through a diverging centrifugation gap between inner and outer walls of a rotor rotating about a central axis within an outer housing. The centrifugation action creates layered flow along an intermediate section. However by crating trailing wakes in the gap between the rotor and housing, localized remixing patterns tending to move in the opposite direction are induced in the layered matter. Platelet rich plasm may then be extracted through adjacent platelet concentrate ports on the inner wall of the rotor. An interior passageway system passes the platelet rich plasma to a platelet concentrate reservoir. Recirculation of blood in the rotor-housing gap between the output and input, and pumping action provided by the diverging centrifugation gap, aid in enhancing throughput and concentration levels.
    Type: Grant
    Filed: October 11, 1988
    Date of Patent: July 31, 1990
    Inventors: Donald W. Schoendorfer, Claude E. Berthe
  • Patent number: 4925441
    Abstract: A cascade formed of a plurality of centrifugal contactors useful for countercurrent solvent extraction processes such as utilizable for the reprocessing of nuclear reactor fuels is modified to permit operation in the event one or both end stages of the cascade become inoperative. Weir assemblies are connected to each of the two end stages by suitable conduits for separating liquids discharged from an inoperative end stage based upon the weight of the liquid phases uses in the solvent extraction process. The weir assembly at one end stage is constructed to separate and discharge the heaviest liquid phase while the weir assembly at the other end stage is constructed to separate and discharge the lightest liquid phase. These weir assemblies function to keep the liquid discharge from an inoperative end stages on the same weight phase a would occur from an operating end stage.
    Type: Grant
    Filed: June 13, 1989
    Date of Patent: May 15, 1990
    Assignee: The United States of America as represented by the United States Department of Energy
    Inventor: Robert T. Jubin
  • Patent number: 4913695
    Abstract: A self-contained liquid vapor purging system for use in such electromotive apparatus as integrated drive generators, or the like, which include a casing and a rotatable shaft extending into the casing. A charge pump circuit communicates with the casing for circulating liquid from the casing and charging liquid back to the casing. An aspirator is located in the charge pump circuit between a charge pump and an inlet to the casing for mixing fresh air with the liquid to deliver an air-liquid mixture to the casing. A centrifugal separator and check valve are incorporated in the rotatable shaft for separating liquid and vapor. The separator includes a vapor-liquid inlet from the casing, a liquid outlet to the casing, and a vapor outlet draining outside the casing. The centrifugal separator includes a centrifugal valve in communication with the vapor outlet for opening only at a predetermined rotary speed of the shaft.
    Type: Grant
    Filed: December 30, 1987
    Date of Patent: April 3, 1990
    Assignee: Sundstrand Corporation
    Inventor: Charles J. Gantzer
  • Patent number: 4820256
    Abstract: In a previously known centrifugal separator the separation chamber (4) of the centrifuge rotor has an inlet (9) for a mixture of two liquids and relatively heavy solids, a central outlet (23a) for separated light liquid and a periphery outlet (12) for separated solids. A third outlet (35) from the separation chamber (4), situated radially between the first said two outlets (23a, 12), communicates with a recirculation channel, which extends partly through a stationary structure and through which liquid may be conducted from the separation chamber (4) through a sensing device (38) and back to said inlet (9) for mixture. The sensing device (38) is arranged to initiate opening of the periphery outlet (12), when a certain amount of heavy liquid has been separated in the separation chamber (4). A throttle is arranged for limiting of the flow through the recirculation channel.
    Type: Grant
    Filed: May 30, 1986
    Date of Patent: April 11, 1989
    Assignee: Alfa-Laval Separation AB
    Inventor: Torbjorn Nordstrom
  • Patent number: 4800138
    Abstract: A fuel cell power system for use in a weightless environment, such as in space, includes a device for removing water from a water-hydrogen mixture condensed from the exhaust from the fuel cell power section of the system. Water is removed from the mixture in a centrifugal separator, and is fed into a holding, pressure operated water discharge valve via a Pitot tube. Entrained nondissolved hydrogen is removed from the Pitot tube by a bleed orifice in the Pitot tube before the water reaches the water discharge valve. Water discharged from the valve thus has a substantially reduced hydrogen content.
    Type: Grant
    Filed: April 16, 1987
    Date of Patent: January 24, 1989
    Assignee: International Fuel Cells Corporation
    Inventors: William E. Romanowski, George T. Suljak
  • Patent number: 4781671
    Abstract: Commercial wide size distribution powders are size classified into precise size fractions by means of a controlled, semi-continuous, multi-stage centrifugal classification system. The system has utility for a wide range of colloidal materials. The throughput of the semi-continuous process is higher than that of batch processes, and the semi-continuous process produces narrow size ranges and optimum yields.
    Type: Grant
    Filed: March 28, 1987
    Date of Patent: November 1, 1988
    Assignee: Ceramics Process Systems Corporation
    Inventors: Richard L. Pober, Bruce E. Novich
  • Patent number: 4773992
    Abstract: A centrifuge system for removing impurities from metal working coolant. The centrifuge of the system includes a liquid inlet, a first liquid outlet for high density liquid, a second liquid outlet for low density liquid, a discharge means for a shoot of particulate material, and a pressure port for receiving liquid under pressure to cause the shoot. A line receives high density liquid from the first liquid outlet. The line discharges into a tank. A branch line connects the line to the pressure port. A valve in the line can stop flow to the tank. When the valve is closed, pressure at the pressure port is increased to cause the shoot.
    Type: Grant
    Filed: March 2, 1987
    Date of Patent: September 27, 1988
    Assignee: Dietrick Sales & Service, Inc.
    Inventors: Gerald P. Dietrick, Curtis C. Wuellner
  • Patent number: 4761157
    Abstract: A decanter centrifuge is equipped with a conventional screw conveyor which advances separated solids or heavy phase material toward a solids discharge zone, and it is also equipped with discharge nozzles mounted on the bowl wall for discharging concentrated solids therethrough from the solids discharge zone. In addition to light phase or liquid discharge means, the centrifuge is further provided with a recycle system which returns at least a portion of the discharged solids to the solids discharge zone via a conduit. At the end of the conduit are recycle tubes mounted on the hub of the screw conveyor. The effect of feeding recycled solids to the discharge zone, to which newly separated solids is also being advanced, is to increase the solids concentration of the solids being discharged by the discharge nozzles.
    Type: Grant
    Filed: May 18, 1983
    Date of Patent: August 2, 1988
    Assignee: Pennwalt Corporation
    Inventor: Leonard Shapiro
  • Patent number: 4759744
    Abstract: In connection with recirculation of separated sludge to the separation chamber of a centrifuge separator there are normally flow restricting nozzles in the sludge outlets of the separation chamber. Only after all separated sludge has passed through these nozzles it is divided into one discharge flow and one recirculation flow.The invention concerns a centrifugal separator with a recirculation circuit (27, 28, 33, 39, 41, 43, 32, 30, 29) for separated sludge, which is completely free of flow restricting nozzles. The amount of separated sludge, that is allowed to leave the centrifugal separator through the outlet conduit (39) without being recirculated, is determined by setting of valves (22, 40) in the stationary outlet conduits (21, 39) for sludge and clarified liquid, respectively.
    Type: Grant
    Filed: February 20, 1987
    Date of Patent: July 26, 1988
    Assignee: Alfa-Laval Separation AB
    Inventor: Goran Krook
  • Patent number: 4708709
    Abstract: A process and apparatus for infinitely variably setting the U.sup.235 tails concentration in the operation of centrifuge cascades for the separation of the uranium isotopes in a gaseous uranium isotope mixture, comprising introducing a cascade feed comprising a mixture of gaseous uranium isotopes containing U.sup.235 into a feed header of an intermediate stage, equalizing the pressure in the feed header of each stage to the pressure of the cascade feed, and maintaining a predetermined U.sup.235 product concentration by manipulating a choke valve on product or tails streams from each stage, or a choke valve on the cascade feed stream to vary the ratio between the cascade feed and the cascade product stream to adjust the U.sup.235 concentration and the tails.
    Type: Grant
    Filed: June 15, 1984
    Date of Patent: November 24, 1987
    Assignee: Uranit GmbH
    Inventor: Robert Zeller
  • Patent number: 4647279
    Abstract: A centrifugal separator comprising a circular centrifuge separation channel having an inlet for receiving a liquid to be separated and an outlet for providing components of the liquid in separated layers at different radial locations, a collection chamber for receiving the separated layers, the chamber having first, second and third outlets in the collection chamber for removing components at different radial locations in the chamber, the first and second collection tubes being joined together so that the combined flow of the two tubes flows in a combined collection tube, and pumps connected to receive liquid streams from the combined collection tube and the third collection tube, the pumps being located externally of, and not rotating with, the channel and collection chamber.
    Type: Grant
    Filed: October 18, 1985
    Date of Patent: March 3, 1987
    Assignee: Cobe Laboratories, Inc.
    Inventors: Alfred P. Mulzet, Robert M. Kellogg
  • Patent number: 4643709
    Abstract: In centrifuges for separating solids-liquid slurries and which discharge concentrated solids through nozzles at the periphery of the centrifugal bowl or rotor, it is necessary to maintain a feed or influent rate at least as great as the nozzle discharge rate. According to the present invention, this is accomplished by driving from the centrifuge drive train a pumping means for returning concentrated solids from the nozzles to the centrifuge for recycling through the bowl.
    Type: Grant
    Filed: May 1, 1985
    Date of Patent: February 17, 1987
    Assignee: Alfa-Laval, Inc.
    Inventors: Chie-Ying Lee, James D. West, Gerald F. Cole
  • Patent number: 4594166
    Abstract: An improved desludging device for basket centrifuges facilitates the automatic withdrawal of hard sludge from the centrifuge. The device includes a sludge discharge tube and a sludge re-slurrying tube, the tubes being connected in a loop, so that fluid exiting the centrifuge through the discharge tube reenters the centrifuge through the re-slurrying tube. The re-slurrying tube terminates in one or more nozzles or slots, pointed in the general direction of the discharge tube. This continual recirculation of fluid causes the hard sludge in the centrifuge to return to the form of a slurry, and the slurry is periodically withdrawn from the centrifuge. The re-slurrying effect may be enhanced by the occasional introduction of some process liquid, or other liquid, into the centrifuge. The sludge discharge tube and re-slurrying tube are mechanically linked, and are programmed to move towards the rim of the centrifuge until substantially all the sludge is removed.
    Type: Grant
    Filed: March 25, 1985
    Date of Patent: June 10, 1986
    Assignee: William D. Clinton
    Inventors: William D. Clinton, Donald J. Hess
  • Patent number: 4505697
    Abstract: In a centrifuge for the separation of solids from liquid in which concentrated solids are discharged from radial nozzles at the rotor periphery, there is a need for control of the solids concentration by controlling the recycle of solids to the centrifuge. The present invention provides a flow path divided into small cross-sectional areas, as with parallel plates, for the flow of recycled solids therethrough, at an appropriate pressure drop and flow rate to cause a strong dependence on fluid viscosity. A small receiving tank, with a fixed or adjustable weir, is attached to the inlet of the sectional flow path to provide a constant pressure drop through the device by maintaining a volume of concentrated solids at a pre-selected height above the inlet. The cross-sectional area available for flow is manually adjustable by means of a blocking plate at the inlet of the sectioned flow path.
    Type: Grant
    Filed: April 30, 1984
    Date of Patent: March 19, 1985
    Assignee: Alfa-Laval, Inc.
    Inventors: Chie-Ying Lee, James D. West, Gerald F. Cole
  • Patent number: 4475897
    Abstract: In a centrifuge of the type in which the solids are continuously discharged through nozzles, the nozzles are dimensioned to ensure that the volume of solids discharged from them is smaller than the volume of solids fed into the centrifuge through a feed line. The solids space in the centrifuge accordingly fills up gradually and, when it is full, the clarified phase begins to get turbid. The level of turbidity is determined by a photocell and the flow of clarified phase returned to the feed line through a diversion valve. Since the amount of liquid being fed into the centrifuge is maintained at a constant level, the volume of new liquid flowing into the centrifuge is decreased by an amount equal to the volume of clarified phase being recirculated.
    Type: Grant
    Filed: July 18, 1983
    Date of Patent: October 9, 1984
    Assignee: Westfalia Separator AG
    Inventor: Werner Bradtmoller
  • Patent number: 4464167
    Abstract: This invention relates to an improvement in two-port centrifuge bowls in which component yield is enhanced by utilizing the centrifuge bowl for eluttriation, as well as centrifugation. In a particular embodiment, platelet yield is improved by terminating flow of anticoagulated whole blood from the donor to the bowl and pumping low density fluid, preferably plasma, back into the bowl at a relatively high rate to elutriate centrifugally separated cells in the bowl.
    Type: Grant
    Filed: August 1, 1983
    Date of Patent: August 7, 1984
    Assignee: Haemonetics Corporation
    Inventors: Donald W. Schoendorfer, Lee E. Hansen