Abstract: A method of fabricating frozen fine liver pieces for an artificial liver which comprises cutting a liver removed from a human being or an animal, from which blood is removed into fine pieces of square shape and freezing the liver pieces with helium gas. A freezing apparatus for an artificial liver which has gas phase pressurizing means for pressurizing liquid helium coupled to a chamber for storing the liquid helium, a helium gas conduit dipped in the liquid helium passed through the chamber to be closed and contained, in which the liver fine pieces are telescopically received and an exhaust conduit provided with a control valve coupled to the freezing chamber.

Abstract: A method of fabricating frozen fine liver pieces for an artificial liver which comprises cutting a liver removed from a human being or an animal, from which blood is removed into fine pieces of square shape and freezing the liver pieces with helium gas. A freezing apparatus for an artificial liver which has gas phase pressurizing means for pressurizing liquid helium coupled to a chamber for storing the liquid helium, a helium gas conduit dipped in the liquid helium passed through the chamber to be closed and contained, in which the liver fine pieces are telescopically received and an exhaust conduit provided with a control valve coupled to the freezing chamber.

Abstract: A method of fabricating frozen fine liver pieces for an artificial liver which comprises cutting a liver removed from a human being or an animal, from which blood has been removed, into fine pieces of square shape and freezing the liver pieces with helium gas. A freezing apparatus for an artificial liver which has gas phase pressurizing means for pressurizing liquid helium coupled to a chamber for storing the liquid helium, a helium gas conduit dipped in the liquid helium passed through the chamber to be closed and contained, to which the liver fine pieces are telescopic, and an exhaust conduit provided with a control valve coupled to the freezing chamber.

Abstract: An apparatus for continuously freezing liver pieces which comprises a freezing box having an inlet and an outlet, a conveyor movable from the inlet to the outlet of the freezing box and having a mesh belt, a number of nozzles provided laterally through the box at the upside of the mesh belt of the conveyor for blowing gaseous helium, a supplying guide portion formed at the head of the inlet at the upside of the mesh belt for supplying and placing the liver pieces, a rotatable roller journaled at the striking-off and exhausting portion disposed inside the striking-off and exhausting portion at the head of the outlet at the upside of the mesh belt in an outside contacting state laterally of the mesh belt, the roller having a number of striking-off projections projected from the surface thereof for striking-off the frozen liver pieces on the mesh belt by the insertion of the projections into the mesh belt.

Abstract: A helium gas liquefying apparatus which has a compressor receiving helium gas stock, plural heat exchangers connected in series with each other via a series liquefying line, plural expansion engines connected in parallel with the corresponding heat exchangers, a Joule-Thompson's valve connected via the liquefying line, a series return line disposed in the reverse flow of the heat exchangers to the liquefying line, a recovery line connected from the reservoir through a recovery valve to the inlet of the compressor, first to third thermometers and a pressure gage. Thus, the apparatus can be fully automatized in various preliminary operations without complicated operations of the conventional apparatus by providing not only the thermometers and the pressure gage but a recovery valve interposed between a liquefied He reservoir and a recovery line.

Abstract: A method of preserving an organ which comprises a first perfusing step of injecting blood uniform i.e.

Abstract: A method of freezing fertilized ova, spermatozoa or the like which has the steps of containing fertilized ova, spermatozoa or the like in a buffer solution at an irregular position in a tube, and cooling the same so that a buffer solution contained in the area containing no fertilized ova, spermatozoa or the like become lower in temperature than the buffer solution containing the fertilized ova, spermatozoa or the like with a desired refrigerant to freeze the second buffer solution to produce crystalline nuclei, and then cooling the nuclei so that the nuclei grow to the first buffer solution. And, an apparatus for freezing fertilized ova, spermatozoa or the like which can carry out the above method. Thus, the survival rate of the fertilized ova, spermatozoa or the like can be raised, and the fertilized ova, spermatozoa or the like can be readily frozen under an automatic control by simple cooling means.

Abstract: An apparatus for freezing fertilized ova, spermatozoa or the like has a heat transfer bottom board block formed at the lower end of a heat insulating peripheral wall with a lower refrigerant passage capable of flowing refrigerant. A bottom board temperature sensor is attached to the bottom board block, an upper heat transfer block is placed on the bottom board block through a heat insulating joint member, formed with an upper refrigerant passage for flowing the refrigerant. A temperature control heater, an upper block temperature sensor, a plurality of erecting tube charging spaces of tubes opened at the top thereof with the bottom board block as a bottom member are disposed between the peripheral wall and the upper block in such a manner that the tubes erected and charged into the spaces are cooled at the lower ends thereof by said bottom board block and at the upper part containing articles to be frozen such as fertilized ova, spermatozoa or the like are contained in buffer solution in said tubes.

Abstract: A method of preserving an organ which comprises first perfusing step of injecting blood uniformly perfusing choline from an artery or portal vein of the excised organ while gradually lowering its temperature and exhausting it from the vein continuing until the liquid is lowered to the first proximity lowering temperature before its solidifying temperature, second perfusing step of perfusing refrigerating defect preventing dimethyl sulfoxide or glycerin instead of the blood uniformly perfusing liquid while gradually lowering its temperature from the first proximity lowering temperature continuing until the agent becomes the second proximity lowering temperature before its solidifying temperature, third perfusing step of perfusing the final perfusing liquid of low solidifying temperature lower than alcohol or ether instead of the agent while gradually lowering the liquid from the second proximity lowering temperature continuing until the liquid becomes the third proximity lowering temperature before its solidif

Abstract: A method of freezing fertilized ova, spermatozoa or the like which has the steps of containing fertilized ova, spermatozoa or the like in a buffer solution at an irregular position in a tube, and cooling the same so that a buffer solution contained in an area containing no fertilized ova, spermatozoa or the like become lower in temperature than the buffer solution containing the fertilized ova, spermatozoa or the like with a desired refrigerant to freeze the second buffer solution to produce crystalline nuclei, and then cooling the nuclei so that the nuclei grow to the first buffer solution. And, an apparatus for freezing fertilized ova, spermatozoa or the like which can carry out the above method. Thus, the survival rate of the fertilized ova, spermatozoa or the like can be raised, and the fertilized ova, spermatozoa or the like can be readily frozen under an automatic control by simple cooling means.

Abstract: A sample cell is located in an inner tank which is surrounded by a heat insulating container. Inert gas is circulated through the inner tank from separate heating and cooling paths. A pressure regulator is located in the sample cell.

Abstract: A helium gas liquefying apparatus which has a compressor receiving helium gas stock, plural heat exchangers connected in series with each other via a series liquefying line, plural expansion engines connected in parallel with the corresponding heat exchangers, a Joule-Thompson's valve connected via the liquefying line, a series return line disposed in the reverse flow of the heat exchangers to the liquefying line, a three-way valve having one passage connected between the return line and the return valve and the other passage branched therefrom to the inlet of the compressor, and an additional line connected from the compressor to the three-way valve. Thus, high efficiency of Joule-Thompson's effect can be obtained.

Abstract: A cryogenic impact testing method of Charpy's and falling weight types which can test a test piece without substantially exposing the test piece with the atmospheric air under the same test piece cooling space, temperature controlling space and impact testing space, and a cryogenic impact testing machine of Charpy's and falling weight types which can execute suitably the above method. Thus, the stable temperature of the test piece can be obtained at the time of testing with highly reliable measured result.

Abstract: A method of liquefying Freon gas using a vessel having an inner and an outer tank, and a jacket around the inner tank which comprises the steps of operating a vacuum pump, opening a solenoid valve to evacuate the air in the space formed between the outer periphery of the inner tank and said jacket to form a vacuum, then supplying Freon gas from a bomb into the inner tank, and cooling the Freon gas in the inner tank through a heat exchange medium such as helium in said space while supplying a cooling medium to a second space between said jacket outer wall and said outer tank inner wall space to thereby liquefy the Freon gas.

Abstract: A cryostatic system utilizing a liquefied gas in which an object or substance to be cooled in a thermostatic chamber without a stirrer and electric heater therein is cooled initially by a liquid coolant at a cryogenic temperature for rapidly lowring its temperature to an intended level and, upon reaching the proximity of said intended level, a temperature sensor detecting the same actuates a temperature controller controlling a heat exchanger, which when actuated gasifies the liquid coolant and controls the temperature of the thus gasified coolant. Thus, upon reaching the proximity of said intended level, said object or substance is cooled by the gasified coolant to be thermostatically controlled thereto with a minimized coolant consumption.

Abstract: In a liquid level indicator for an extremely low temperature-liquefied gas wherein a current is caused to flow through a superconductor wire immersed in the extremely low temperature-liquefied gas, a voltage across terminals of the superconductor wire is measured, and the liquid level of the liquefied gas lying between the terminals is gauged on the basis of the measured value, the improvement therein comprising the providing of a current supply portion which, at first, increases the current to be fed to the superconductor wire up to the so-called plateau region in a current - voltage hysteresis curve of the superconductor wire, and thereafter, decreases it down to a return-path rectilinear region in the curve departing from the plateau region, the liquid level being gauged on the basis of the measured value of the terminal voltage of the superconductor wire as obtained by the use of the decreased current.