189 results about "Dielectric heating" patented technology

An electrosurgical system for sealing vessels using capacitive (RF) dielectric heating and a method thereof are provided. The system includes an electrosurgical instrument having an end effector with parallel plate electrodes that will clamp onto a vessel and maintain a specified gap distance; however, the electrodes will be coated with a non-conductive dielectric material. Such an end effector will ensure that direct conduction between the electrodes does not occur through tissue or fluids and effectively creates a parallel plate capacitor with a dielectric, e.g., tissue and coating, in between the plates. The electrosurgical instrument will be activated with an AC signal at a specified RF frequency, e.g., a Debye resonance frequency, via an electrosurgical generator. An effective AC current will flow through the tissue and cause heating due to fictional losses from rotating polar molecules in the tissue.

An indwelling RF catheter achieves warming of patients by dielectric heating of blood or other bodily fluids. In one example, the catheter is deployed in a suitable blood vessel, such as the inferior vena cava. The catheter design includes an emitter structure electrically coupled to an RF generator, which provides a source of RF power. The emitter structure, distally located upon the catheter, administers electromagnetic radiation to the blood within the patient, thereby creating heat due to the dielectric qualities of blood. As blood heated by the indwelling RF catheter courses through the patient's body, the patient's body is systemically warmed, raising the body core temperature.

This invention relates to the design of a process by intermittent dielectric heating combined with a recycling system. This process consists in subjecting reagents to electromagnetic waves selected in the frequencies ranging between 300 GHz and 3 MHz intermittently using a recycling system. This process enables the treatment of oils that are hardly absorbent as well as great investment savings. This process enables operation on different scales, whether in laboratories, on a semi-industrial or industrial scale, without forfeiting the advantages of continuous dielectric heating.

A method of heating an object using a dielectric heating. The method comprises positioning an object in a cavity of a dielectric heating oven, allowing a user to allocate an amount of energy to dissipate in the object during a temperature elevation of the object, and elevating the temperature of the object by using the dielectric heating oven according to the amount of energy.

An MRI compatible electrode circuit construct is provided. The construct includes at least two filter components constructed from an electrode wire. One filter component may be a resonant LC filter at or near an electrode/wire interface that resolves the issue of insufficient attenuation by effectively blocking the RF induced current on the wire from exiting the wire through the electrode. The second filter component may include one or more non-resonant filter(s) positioned along the length of the electrode wire that resolve(s) the issue of excessive heating of the resonant LC filter by significantly attenuating the current induced on the wire before it reaches the resonant LC filter. The non-resonant filter(s) may also attenuate the RF current reflected from the resonant LC filter thereby resolving the issue of the strong reflected power from the resonant filter and the associated dielectric heating.

Sorting dissimilar materials, such as sorting plastics from wood, foam, or rubber. These systems and methods employ either dielectric heating or fluorescent dye absorption characteristics of materials to distinguish the materials. The systems and methods may employ differential dielectric heating and thermal imaging to sort wood, rubber, and foam, from plastic, metals, and other materials that do not undergo dielectric heating. Similarly, systems and methods may employ the greater liquid absorption properties of wood, rubber, and foam as compared to plastic. The dissimilar materials are subjected to fluorescent dye and carrier liquid, that is differentially absorbed by objects. Fluorescent imaging can be used to distinguish the materials. In either case, a computer-controlled system can be used to sort material types based on an evaluation of the thermal or fluorescent image.

A drying device includes: a dielectric heating unit configured to apply an alternating electrical field to a medium onto which a liquid containing a conductive material, water, and a solvent has been discharged, and perform dielectric heating of the liquid; and a conductive member disposed either to make contact with or to be close to the medium to which the alternating electrical field is being applied.

Provided are a method for connecting members together that can easily form a connection structure, which has about the same high level of connection strength over the entire range of a position of superposition, in a short time, and a connection structure. The method is a method for connecting two or more members together, at least one of which is a fiber reinforced resin member containing a thermoplastic resin and also containing a reinforcing fiber material that serves as a heating element in the thermoplastic resin, at a position of superposition. The method includes pressing the members against each other while heating the members at a position of superposition using one of induction heating or dielectric heating and thus melting the thermoplastic resin with heat generated from the fiber material that serves as the heating element, thereby connecting the members together.

A method is provided for producing crystalline nanoparticle semiconductor material. The method includes the steps of mixing a precursor in a solvent to form a reaction mixture and subjecting the reaction mixture to microwave dielectric heating at sufficient power to achieve a superheating temperature of the reaction mixture. A growth-phase reaction is permitted to proceed, wherein nanoparticles are formed in the heated reaction mixture. The reaction is then quenched to substantially terminate nanoparticle formation.

An apparatus and method for selectively heating a biological target within a treatment region of a subject is disclosed. The method includes administering to the subject a dielectric heating modulator that becomes associated with the biological target. The method also includes positioning the treatment region between first and second electrodes connected to a generator, and activating the generator to apply an alternating electric field between the first and second electrodes and across the treatment region to thereby heat the treatment region. The dielectric heating modulator causes the biological target to heat at a faster rate than non-targets within the treatment region, which preferably results in the killing of the biological target.

The invention provides a plasma torch for dielectric heating, and relates to plasma equipment. The plasma torch is mainly composed of a front torch body, an anode, a rear torch body, a cathode and an insulation frame. The front torch body is provided with a guide sleeve and a cylinder extending backwards, and the guide sleeve is arranged in the inner space of the cylinder; the anode is embedded into the front torch body, the space between the cylinder of the front torch body and the wall of the anode forms a cooling water jacket, a cathode base is arranged on a rotary body structure of the rear torch body, the cathode is installed at the front end of the cathode base, and a cooling cavity is formed in the cathode. The front torch body is installed at the front end of the insulation frame, the extending cylinder of the front torch body is inserted into a front inserting port of the insulation frame, the rear torch body is installed at the rear end of the insulation frame, the cathode base on the rear torch body enters a rear inserting port of the insulation frame, the head of the cathode stretches into a cylindrical space in the rear portion of the anode, and the space between the head of the cathode and the wall of the rear portion of the anode forms an ionization channel. The plasma torch is used for pyrolyzing water to manufacture hydrogen or used for processing harmful substances, thereby reducing the dependence on coal and oil of people and preserving the ecological environment.

There are provided (1) a method of manufacturing a three-dimensional decoration piece having a flat rear surface, (2) a method of manufacturing the decoration piece by easily cutting the same by means of a fusion cutter, (3) a method of manufacturing the decoration piece having a bonding or sticking feature on the rear surface and (4) a method of manufacturing a three-dimensional decoration piece without limiting the characteristics of the base member thereof. The three-dimensional decoration piece is manufactured by using an indented mold and high frequency dielectric heating. An indented mold having a second fusion cutter and arranged along an outer periphery of the fusion cutter is used. Firstly, a three-dimensional molded body of upper and intermediate layers having a recessed section on a lower surface thereof is molded by means of an indented mold and a protruding mold, and subsequently a lower layer material is molten by high frequency dielectric heating and made to flow into the recessed section. Firstly, a three-dimensional molded body of upper and intermediate layers is molded, and subsequently the three-dimensional molded body is welded to a base member by means of high frequency dielectric heating.

The object of the invention is not only to simplify the structure of a high frequency dielectric heating power control apparatus and reduce the size of the apparatus but also to eliminate the need for control and design corresponding to the kind of a magnetron and thus enhance the running efficiency of the apparatus.

An input current to an inverter circuit is detected by a shunt resistor 71 and is converted to an input current wave form through an input current signal amplifier 72. On the other hand, based on an alternating current power supply voltage wave form from an alternating power supply voltage, there is obtained through a gain variable amplifier 91 a reference wave form following the size of the input current wave form. A wave form error detect circuit 92 compares the input current wave form with the reference wave form to obtain a wave form error signal. A comparison circuit 74 compares the input current wave form with an input current reference signal obtained from an output setting part 75 for obtaining a desired high frequency output to thereby obtain a current error signal. And, a mix and filter circuit 81 adds the wave form error signal and the current error signal to obtain a power control signal for driving a switching transistor 39 of the inverter circuit. Here, the reference wave form is generated based only on the alternating current power supply voltage wave form and on the feedback signal of the wave form error signal.

A power control unit for a high-frequency dielectric heating not affected by variations in the magnetron type or characteristic, and power supply voltage fluctuation, etc., is provided. The power control unit for a high-frequency dielectric heating has an input current detection section 71, 72 for detecting input current of an inverter 10 for rectifying 31 an AC power supply voltage 20, performing high-frequency switching of the voltage, and converting the voltage to high-frequency power. The power control unit for a high-frequency dielectric heating converts a switching frequency control signal 92 provided by mixing input current waveform information 90 and power control information 91 into a drive signal of a semiconductor switching element 3, 4 of the inverter.

A hydrocarbon bearing formation (304) which is heated using a automatic impedance matching (181) capacitive radio frequency dielectric heating (334) in situ process. Hydrocarbons or other substances natural to a hydrocarbonaceous formation may be produced by heating specific chemical compositions with or without the use of a carrier medium (320) in a subterranean reservoir. Hydrocarbons or other substances natural to a hydrocarbonaceous formation are heated by maintaining specific chemical compositions in an alternating current electrical field generated by a radio frequency signal. As the targeted chemical compositions increase in temperature, maximum energy is delivered using automatic impedance matching to adjust the rate of the heating process.

A method of separating a mixture of liquid and insoluble solids in a filter press may comprise: pumping the mixture into a chamber between two filter plates in the filter press to form a filter cake, wherein the chamber is lined by filter cloths, and wherein, during the pumping, filtrate is forced through the filter cloths and out of the chamber; heating the filter cake in the chamber, wherein, during the heating, filtrate is forced through the filter cloths and out of the chamber, and wherein the heating is by radio frequency irradiation of the filter cake in the chamber; and releasing dried filter cake from the chamber. A filter press system for separating a mixture of liquid and insoluble solids may comprise: a frame; a plurality of filter plates configured to form a stack of parallel plates, each of the plurality of filter plates being movably attached to the frame, the plurality of filter plates further being configured to form a multiplicity of chambers, each of the multiplicity of chambers being lined by filter cloths, wherein the plurality of filter plates, the multiplicity of chambers and the filter cloths are configured to allow filtrate to escape from the chambers while retaining solids from the mixture to form a filter cake; and a radio frequency heater, for directly heating the filter cake in the multiplicity of chambers. The radio frequency heating may include microwave heating, or dielectric heating by lower frequency radio waves in the range of 1 to 100 MHz.