US3427422A - Microwave heating apparatus - Google Patents

Microwave heating apparatus Download PDF

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Publication number
US3427422A
US3427422A US551106A US3427422DA US3427422A US 3427422 A US3427422 A US 3427422A US 551106 A US551106 A US 551106A US 3427422D A US3427422D A US 3427422DA US 3427422 A US3427422 A US 3427422A
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US
United States
Prior art keywords
holder
container
temperature
microwave
heating apparatus
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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
Application number
US551106A
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English (en)
Inventor
Paul Curt Muller
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.)
Patelhold Patenverwertungs and Elektro-Holding AG
Original Assignee
Patelhold Patenverwertungs and Elektro-Holding AG
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.)
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Application filed by Patelhold Patenverwertungs and Elektro-Holding AG filed Critical Patelhold Patenverwertungs and Elektro-Holding AG
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Publication of US3427422A publication Critical patent/US3427422A/en
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Expired - Lifetime legal-status Critical Current

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    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B6/00—Heating by electric, magnetic or electromagnetic fields
    • H05B6/64—Heating using microwaves
    • H05B6/6408—Supports or covers specially adapted for use in microwave heating apparatus
    • H05B6/6411—Supports or covers specially adapted for use in microwave heating apparatus the supports being rotated
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
    • A61K41/00—Medicinal preparations obtained by treating materials with wave energy or particle radiation ; Therapies using these preparations
    • A61K41/10—Inactivation or decontamination of a medicinal preparation prior to administration to an animal or a person
    • A61K41/13—Inactivation or decontamination of a medicinal preparation prior to administration to an animal or a person by ultrasonic waves
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
    • A61M5/00—Devices for bringing media into the body in a subcutaneous, intra-vascular or intramuscular way; Accessories therefor, e.g. filling or cleaning devices, arm-rests
    • A61M5/44—Devices for bringing media into the body in a subcutaneous, intra-vascular or intramuscular way; Accessories therefor, e.g. filling or cleaning devices, arm-rests having means for cooling or heating the devices or media
    • A61M5/445—Devices for bringing media into the body in a subcutaneous, intra-vascular or intramuscular way; Accessories therefor, e.g. filling or cleaning devices, arm-rests having means for cooling or heating the devices or media the media being heated in the reservoir, e.g. warming bloodbags

Definitions

  • the present invention relates to microwave high frequency heating apparatus of the general type including a microwave generator with means to apply a microwave energy beam unto the material or substance to be heated disposed in an enclosed heating space or chamber, and more particularly to improved heating apparatus of this type for the heating of easily coagulable liquid substances, and/or substances liable to bubble or foam formation during heating, in particular preserved blood, and stored in non-metallic bottles or the like containers.
  • FIG. 1 shows, in part diagrammatically and in part in section, microwave heating apparatus constructed in accordance with the principles of the invention
  • FIG. 2 shows a section, to an enlarged scale, taken on line 22 of FIG. 1;
  • FIG. 3 more clearly shows the temperature sensing device of the automatic temperature control forming part of the preceding figures.
  • the invention involves generally the provision of means providing an enclosed microwave treating space or chamber having disposed therein an openended hollow and rotatably mounted container holder of microwave permeable insulating material, the inside space enclosed by said holder substantially conforming to the configuration of the containers storing the liquid to be heated, in particular preserved blood or a like easily coagulable liquid substance.
  • the container holder is rotated about an axis coincident with the axis of the container mounted therein, such as a bottle or the like oblong storage vessel, while a microwave energy beam is impinged from a microwave generator (magnetron, klystron, etc.) upon the holder and the liquid container via suitable wave guide means connecting the generator with the heating space or chamber.
  • a microwave generator microwave generator
  • the temperature-sensing element in cooperation with the automatic temperature control device serves to heat the liquid by direct action of the microwave energy to a desired temperature and to maintain it at this temperature, for example 35 in the case of blood plasma. Due to the rotation of the liquid, coagulation and bubble or foam formation is substantially eliminated or minimized and the heating time to the desired temperature reduced to a minimum.
  • the oblong bottles or the like containers, and in turn the rotatable container holder are disposed at an inclined angle with the microwave beam being impinged thereon in a substantially upward or vertical direction, in such a manner as to achieve an improved mixing or stirring effect (by friction with the bottle wall) on the liquid stored in the bottle or container, combined 'with ease in handling and exchange of the containers.
  • the inclination of the containers and application of the microwave energy at an angle or vertically in relation to the rotating axis of the liquid results in a relatively faster heating of the lower portion of the liquid, causing this warmer liquid to rise to the top with the result of a greater mixing or stirring action and, in a turn, a further reduced heating time.
  • the apparatus of the invention has been found especially suitable for the heating of preserved blood in substantially preventing coagulation or foam formation, while reducing heating time to a minimum.
  • the microwave treating space proper or chamber 10 is closed by a hinged snap lid or cover 11 for the positioning therein and withdrawal of the containers storing the liquid to be heated.
  • a container or vessel holder 14 Rotatively mounted in an inclined wall 12 of the chamber 10, by means of a bearing 13, is a container or vessel holder 14 in the form of an open-ended hollow member consisting of microwave permeable insulating material and having an inside space substantially conforming to the configuration of a bottle or the like container 20 storing the liquid to be heated, such as preserved blood or plasma.
  • a rotating speed of the container of about 30 revolutions per minute and an incline angle of about 30 have been found to produce satisfactory results in treating or heating blood plasma.
  • the container 20 which can be easily inserted into and withdrawn from the holder 14 on account of the inclined mounting of the latter, is held or retained in the holder by friction, whereby to rotate together with said holder and to maintain a close thermal contact with the temperature-sensing element mounted upon the inside wall of the holder and forming part of an automatic 3 temperature control device, serving, in cooperation with a suitable microwave generator, to raise the temperature of the liquid to be treated to and to maintain it at a desired temperature, such as 35 in the case of preserved blood.
  • the friction mounting means for the container is comprised of a rubber or the like flexible sleeve 21 encircling the hollow portion of the holder 14 in stretched condition, said sleeve acting upon the outer perimeter of the container 20 via a pair (in the example shown) of non-metallic pressure pins 22 of greater length than the wall thickness of said holder and mounted slidably in radial bores of said holder, whereby said pins fitted with suitable outer heads engage the inside of the sleeve 21, on the one hand, and the container, on the other hand, to result in an adequate frictional engagement between the container 20 and holder 14, or temperature-sensing device described in the following.
  • the temperature-sensing device comprises, in the example shown, a thin metallic sheet 23 having soldered or otherwise connected thereto a thin-walled metal casing or screen 23 disposed in a recess of the holder 14 and housing a pair of temperature-sensitive resistors or thermistors 25 and 26 supported in heat-conducting contact by the sheet 23.
  • the element 23 may consist of a thin bronze sheet having a thickness of from 0.1 to 0.3 millimeter, though not limited thereto, and possessing a very small heat capacity.
  • the thermistors 25 and 26 being electrically and magnetically shielded by the housing 23 are connected, via suitable conductors (not shown) mounted in shielded condition within the axis of the holder 14, each to a pair of slip rings 29, 30, respectively, cooperating in a known manner with pairs of stationary brushes or sliding contacts 27, 29, respectively, the latter being in turn connected to an automatic temperature control device 39 of known construction connected to the power supply 40 of the microwave generator 36 of the heating apparatus, such as a magnetron, klystron, etc., having its output applied, via a suitable coupling wave guide 37, to the heating chamber 10, to impinge a microwave energy beam upon the liquid in the container 20 to be heated.
  • the outlet end of the wave guide 37 may be closed in water-tight fashion by a Teflon or the like microwave permeable plate or closure 38.
  • a safety switch 31 operated by a spring-urged plunger 32, mounted axially within the holder 14 and slip rings 29, and engaged at its inner end by the bottom of the container 20 in the mounted position, serves to disconnect the generator as long as there is no container in the device.
  • the generator 36 may be disconnected during opening of the lid 11 by the provision of a further safety switch 33 operably connected with said lid, as indicated.
  • the temperature control device 39 including a suitable temperature standard, operates in a known manner to connect and disconnect the generator 36, via its power supply 40 in the example shown, whenever the temperature of the container or liquid stored therein falls below or rises above the desired value, that is 35 on the case of preserved blood, whereby to raise the liquid to and to automatically maintain it at said temperature within a desired accuracy or tolerance range.
  • the chamber 10 and generator 36 are enclosed, according to an improved feature of the invention, in an outer housing 35 having its temperature stabilized or maintained at the temperature of the ambient atmosphere.
  • the microwave generator 36 together with the coupling wave guide 37 are suction cooled by the provision of a fan or blower 41 disposed in airtight manner between the outlet duct of the generator cooling device and an opening in the housing wall 35, the inlet of the generator cooling device being connected with the outside atmosphere through suitable inlet ports in the housing wall 35.
  • the second thermistor, 26 connected to the contacts 29 is independent of the thermistor 25 and may serve to operate a suitable temperature indicator or measuring device (not shown).
  • the microwave power is advantageously adjusted such that a container of 500 cm. capacity may be heated from +5 to +35 C. in approximately 3 to 5 minutes.
  • the degree of accuracy is within 1 C. even with contents of from 300 to 500 cm.
  • This accuracy and the relative short heating time can be attained only if the blood is moved slowly and gently, in particular by rotation, as shown and described, to avoid the formation of bubbles.
  • Microwave heating apparatus for the treatment of liquids stored in non-metallic containers comprising in combination:
  • a microwave generator including wave guide coupling means connecting the same with said treating space, to impinge a microwave beam in a substantially vertically upward direction unto said holder and the container mounted therein,
  • automatic temperature control means operably connecting said sensing means with said generator, to heat the liquid stored in said container to and maintain it at a predetermined temperature.
  • said temperature-sensing means consisting of a strip of heat-conducting metal of low thermal capacity and mounted upon the inside wall of said holder, said strip held in close thermal contact with the container mounted therein by said resilient means, and a heat-sensitive electrical resistor disposed in a recess of said holder and afiixed to said strip.
  • Microwave heating apparatus as claimed in claim 2, including metallic screening means enclosing said resistor.
  • said resilient means consisting of a sleeve of flexible material encircling said holder in stretched condition, and at least one pressure pin of greater length than the wall thickness of said holder, said pin arranged slidable within a bore through said holder with one end thereof engaging said sleeve and with its opposite end engaging the container mounted in said holder.
  • Microwave heating apparatus as claimed in claim 1, including a housing having air inlet and outlet means and enclosing said treating space, said holder rotating means,
  • said generator and said temperature control means and further means to aspirate and circulate ambient air through said generator via said inlet and said outlet means.

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  • Health & Medical Sciences (AREA)
  • Animal Behavior & Ethology (AREA)
  • Veterinary Medicine (AREA)
  • Public Health (AREA)
  • General Health & Medical Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Epidemiology (AREA)
  • Pharmacology & Pharmacy (AREA)
  • Medicinal Chemistry (AREA)
  • Chemical & Material Sciences (AREA)
  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Vascular Medicine (AREA)
  • Engineering & Computer Science (AREA)
  • Anesthesiology (AREA)
  • Biomedical Technology (AREA)
  • Heart & Thoracic Surgery (AREA)
  • Hematology (AREA)
  • Investigating Or Analysing Biological Materials (AREA)
US551106A 1965-05-19 1966-05-18 Microwave heating apparatus Expired - Lifetime US3427422A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CH698865A CH444338A (de) 1965-05-19 1965-05-19 Mikrowellenbehandlungsgerät zum Erwärmen von Flüssigkeiten, insbesondere von Blutkonserven

Publications (1)

Publication Number Publication Date
US3427422A true US3427422A (en) 1969-02-11

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Family Applications (1)

Application Number Title Priority Date Filing Date
US551106A Expired - Lifetime US3427422A (en) 1965-05-19 1966-05-18 Microwave heating apparatus

Country Status (4)

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US (1) US3427422A (de)
AT (1) AT257004B (de)
CH (1) CH444338A (de)
FR (1) FR1505372A (de)

Cited By (22)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3963892A (en) * 1972-06-14 1976-06-15 Camph Engineering Company Ab Controlling the microwave heating of flowing blood as a function of heated blood temperature
FR2336670A1 (fr) * 1975-12-22 1977-07-22 Gen Electric Dispositif sensible a sonde sensible a la temperature pour le controle de la temperature interne d'aliments
US4286133A (en) * 1979-05-29 1981-08-25 Whirlpool Corporation Bi-rotational microwave oven turntable/rotisserie
US4467163A (en) * 1981-01-19 1984-08-21 Baxter Travenol Laboratories, Inc. Temperature sensing system for microwave oven apparatus
US4471193A (en) * 1981-01-19 1984-09-11 Baxter Travenol Laboratories, Inc. Microwave heating apparatus with plural temperature sensors
US4503307A (en) * 1983-06-20 1985-03-05 The United States Of America As Represented By The Secretary Of The Navy Shielding apparatus for microwave thawing
EP0190430A1 (de) * 1985-01-25 1986-08-13 Societe Des Produits Nestle S.A. Verfahren und Vorrichtung zum Erhitzen von Lebensmitteln
US4652712A (en) * 1985-01-23 1987-03-24 Kurt Zeipel Microwave appliance used for warming blood or blood derivatives stored in a bag
US4714813A (en) * 1984-05-29 1987-12-22 Trenchard Paul M Mixer for use with microwave oven
US4742202A (en) * 1983-06-20 1988-05-03 The United State Of America As Represented By The Secretary Of The Navy Microwave apparatus for heating contained liquid
US4801777A (en) * 1987-09-03 1989-01-31 Vanderbilt University Blood rewarming method and apparatus
US4820892A (en) * 1985-08-22 1989-04-11 Tetra Pak International Ab Heating arrangement for packing containers holding liquid contents
WO1990003718A1 (en) * 1988-09-28 1990-04-05 Core Consulting Group Limited Microwave-powered heating chamber
EP0467625A3 (en) * 1990-07-19 1992-08-05 Cem Corporation Temperature controlled microwave system for heating contents of sealed moving containers
FR2677853A1 (fr) * 1991-06-20 1992-12-24 Bongrain Sa Procede et dispositif de decongelation.
US5374811A (en) * 1992-05-06 1994-12-20 The United States Of America As Represented By The Secretary Of The Air Force Blood and tissue rewarming device
US5463821A (en) * 1995-01-03 1995-11-07 Whirlpool Corporation Method and apparatus for operating a microwave dryer
US5786580A (en) * 1995-12-11 1998-07-28 Lg Electronics Inc. Packaging holder for positioning and protecting microwave oven internal elements such as a glass tray and a rotating ring within an oven cavity for handling and shipping
US20020084264A1 (en) * 2000-07-24 2002-07-04 Mls Mikrowellen-Labor-Systeme Gmbh Device for performing multiple chemical reactions and process in high frequency fields
RU2254850C2 (ru) * 2003-07-03 2005-06-27 Общество с ограниченной ответственностью Научно-производственная инновационная фирма "Гиперион" Устройство для размораживания криоконсервированного биопродукта
US20080185377A1 (en) * 2005-12-22 2008-08-07 Challnge-Rmf, Inc. Thermal processor of meat
US20090218337A1 (en) * 2008-03-03 2009-09-03 Lee Fang Microwave oven with rotary cooking apparatus

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2492210A1 (fr) * 1980-10-09 1982-04-16 Applic Micro Ondes Ste Fse Procede et appareil de chauffage d'un produit par micro-ondes, notamment a des fins de decongelation, et application au plasma sanguin
EP0192024B1 (de) * 1985-01-23 1989-06-07 Kurt Zeipel Zum Erwärmen von im Beutel bevorratetem Blut oder Blutderivaten dienendes Mikrowellengerät
DE19548826C2 (de) * 1995-12-27 1999-10-28 Guenther Schmidt Elektrisches Schnellauftaugerät und Verfahren zum raschen Auftauen von gefrorenen Flüssigkeiten

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1249130A (fr) * 1959-02-25 1960-12-23 Miwag Mikrowellen Ag Cuisinière électrique avec dispositif complémentaire à micro-ondes
US3081392A (en) * 1955-02-24 1963-03-12 Tappan Co High-frequency oven
US3127495A (en) * 1961-09-05 1964-03-31 Studebaker Corp Microwave oven
US3154663A (en) * 1959-01-30 1964-10-27 Nat Scient Lab Inc Apparatus and process for thawing temperature sensitive frozen materials
US3177335A (en) * 1963-06-19 1965-04-06 Gen Electric Thermostat probe for combined uhf and infrared energy cooking oven
US3185809A (en) * 1961-09-04 1965-05-25 Miwag Mikrowellen Ag Temperature sensitive control
US3281568A (en) * 1963-11-12 1966-10-25 Thermowave Corp Oven control system
US3315681A (en) * 1964-08-17 1967-04-25 Heinz F Poppendiek Means and techniques useful for changing temperature of fluids, particularly blood

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3081392A (en) * 1955-02-24 1963-03-12 Tappan Co High-frequency oven
US3154663A (en) * 1959-01-30 1964-10-27 Nat Scient Lab Inc Apparatus and process for thawing temperature sensitive frozen materials
FR1249130A (fr) * 1959-02-25 1960-12-23 Miwag Mikrowellen Ag Cuisinière électrique avec dispositif complémentaire à micro-ondes
US3185809A (en) * 1961-09-04 1965-05-25 Miwag Mikrowellen Ag Temperature sensitive control
US3127495A (en) * 1961-09-05 1964-03-31 Studebaker Corp Microwave oven
US3177335A (en) * 1963-06-19 1965-04-06 Gen Electric Thermostat probe for combined uhf and infrared energy cooking oven
US3281568A (en) * 1963-11-12 1966-10-25 Thermowave Corp Oven control system
US3315681A (en) * 1964-08-17 1967-04-25 Heinz F Poppendiek Means and techniques useful for changing temperature of fluids, particularly blood

Cited By (26)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3963892A (en) * 1972-06-14 1976-06-15 Camph Engineering Company Ab Controlling the microwave heating of flowing blood as a function of heated blood temperature
FR2336670A1 (fr) * 1975-12-22 1977-07-22 Gen Electric Dispositif sensible a sonde sensible a la temperature pour le controle de la temperature interne d'aliments
US4286133A (en) * 1979-05-29 1981-08-25 Whirlpool Corporation Bi-rotational microwave oven turntable/rotisserie
US4467163A (en) * 1981-01-19 1984-08-21 Baxter Travenol Laboratories, Inc. Temperature sensing system for microwave oven apparatus
US4471193A (en) * 1981-01-19 1984-09-11 Baxter Travenol Laboratories, Inc. Microwave heating apparatus with plural temperature sensors
US4503307A (en) * 1983-06-20 1985-03-05 The United States Of America As Represented By The Secretary Of The Navy Shielding apparatus for microwave thawing
US4742202A (en) * 1983-06-20 1988-05-03 The United State Of America As Represented By The Secretary Of The Navy Microwave apparatus for heating contained liquid
US4714813A (en) * 1984-05-29 1987-12-22 Trenchard Paul M Mixer for use with microwave oven
US4652712A (en) * 1985-01-23 1987-03-24 Kurt Zeipel Microwave appliance used for warming blood or blood derivatives stored in a bag
EP0190430A1 (de) * 1985-01-25 1986-08-13 Societe Des Produits Nestle S.A. Verfahren und Vorrichtung zum Erhitzen von Lebensmitteln
US4659890A (en) * 1985-01-25 1987-04-21 Nestec S.A. Process and apparatus for microwave heating foods
US4820892A (en) * 1985-08-22 1989-04-11 Tetra Pak International Ab Heating arrangement for packing containers holding liquid contents
US4801777A (en) * 1987-09-03 1989-01-31 Vanderbilt University Blood rewarming method and apparatus
WO1990003718A1 (en) * 1988-09-28 1990-04-05 Core Consulting Group Limited Microwave-powered heating chamber
EP0467625A3 (en) * 1990-07-19 1992-08-05 Cem Corporation Temperature controlled microwave system for heating contents of sealed moving containers
FR2677853A1 (fr) * 1991-06-20 1992-12-24 Bongrain Sa Procede et dispositif de decongelation.
US5374811A (en) * 1992-05-06 1994-12-20 The United States Of America As Represented By The Secretary Of The Air Force Blood and tissue rewarming device
US5463821A (en) * 1995-01-03 1995-11-07 Whirlpool Corporation Method and apparatus for operating a microwave dryer
US5786580A (en) * 1995-12-11 1998-07-28 Lg Electronics Inc. Packaging holder for positioning and protecting microwave oven internal elements such as a glass tray and a rotating ring within an oven cavity for handling and shipping
US20020084264A1 (en) * 2000-07-24 2002-07-04 Mls Mikrowellen-Labor-Systeme Gmbh Device for performing multiple chemical reactions and process in high frequency fields
US6717119B2 (en) * 2000-07-24 2004-04-06 Milestone S.R.L. Device for performing multiple chemical reactions and processes in high frequency fields
RU2254850C2 (ru) * 2003-07-03 2005-06-27 Общество с ограниченной ответственностью Научно-производственная инновационная фирма "Гиперион" Устройство для размораживания криоконсервированного биопродукта
US20080185377A1 (en) * 2005-12-22 2008-08-07 Challnge-Rmf, Inc. Thermal processor of meat
US20090218337A1 (en) * 2008-03-03 2009-09-03 Lee Fang Microwave oven with rotary cooking apparatus
US8847131B2 (en) 2008-03-03 2014-09-30 Lee Fang Microwave oven with rotary cooking apparatus
WO2009114078A3 (en) * 2008-03-03 2016-03-24 Lee Fang Microwave oven with rotary cooking apparatus

Also Published As

Publication number Publication date
CH444338A (de) 1967-09-30
AT257004B (de) 1967-09-25
FR1505372A (fr) 1967-12-15

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