Abstract: The invention relates to an alternating magnetic field application device for heating magnetic or magnetizable substances in biological tissue, in particular for thermal therapy using magnetic nanoparticles, composed of a large applicator (1) having a magnetic yoke (2) and two oppositely situated pole shoes (7, 8) on the magnetic yoke (2) which are separated by an exposure gap (13), and having two magnetic coils (9, 10), which are respectively associated with a pole shoe (7, 8), for generating a substantially homogenous alternating magnetic field (12) of a given field strength in the exposure gap (13), wherein the biological tissue to be irradiated may be brought into the exposure gap (13) as an exposure target volume.

Abstract: In the process of generating high frequency magnetic fields for treating living organisms, an apparatus for limiting undesirable interference and disturbance that may be caused by electromagnetic radiation from said fields.

Abstract: The invention relates to an alternating magnetic field application device for heating magnetic or magnetizable substances in biological tissue, in particular for thermal therapy using magnetic nanoparticles, composed of a large applicator (1) having a magnetic yoke (2) and two oppositely situated pole shoes (7, 8) on the magnetic yoke (2) which are separated by an exposure gap (13), and having two magnetic coils (9, 10), which are respectively associated with a pole shoe (7, 8), for generating a substantially homogenous alternating magnetic field (12) of a given field strength in the exposure gap (13), wherein the biological tissue to be irradiated may he brought into the exposure gap (13) as an exposure target volume.

Abstract: In the process of generating high frequency magnetic fields for treating living organisms, an apparatus for limiting undesirable interference and disturbance that may be caused by electromagnetic radiation from said fields.

Abstract: A magnetic coil arrangement for a magnetic field applicator (1) which heats magnetic or magnetizable substances or solids in biological tissue is disclosed which includes a coolable magnetic yoke (2) with two spaced, opposing pole shoes (7, 8) separated from each other by a exposure volume gap (12) on the magnetic yoke (2). A magnetic coil (22) is assigned to each of the two pole shoes (7, 8) to produce a magnetic alternating field. The magnetic coils are designed as disk coils with helicoidally extending coil windings (39) respectively surrounding the pole shoe end of the assigned pole shoe (7, 8) with a surrounding magnetic coil/pole shoe gap (57). According to the invention, the magnetic coil (22) is respectively arranged in a coil box annularly surrounding the assigned pole shoe (7, 8), with the coil box (9, 10) being provided with at least one cooling air admission port (51, 52, 53) for connection of a cooling air pump and with at least one cooling air discharge port (57, 66).

Abstract: A magnetic field applicator to heat magnetic substances in biological tissue, having a magnetic yoke with two pole shoes across from each other and separated from each other by a distance that defines the magnetic field exposure volume produced by the applicator, and with two magnetic coils, one assigned to each of the two pole shoes, to produce a magnetic field. The magnetic yoke and the pole shoes consist of ferrite segments assembled together. The pole shoes oppose each other and are surrounded by magnetic disk-shaped coils with one or more windings extending helicoidally, which creates an intermediate air gap between the pole shoes and coils. This results in a magnetic field applicator with the ability to effectively and efficiently administer hyperthermia and thermo-ablation procedures to destroy cancerous tissue in a patient, as well as having uses in other medical and industrial applications.

Abstract: A magnetic field applicator to heat magnetic substances in biological tissue, having a magnetic yoke with two pole shoes across from each other and separated from each other by a distance that defines the magnetic field exposure volume produced by the applicator, and with two magnetic coils, one assigned to each of the two pole shoes, to produce a magnetic field. The magnetic yoke and the pole shoes consist of ferrite segments assembled together. Additionally, the magnetic field applicator is composed of a magnetic yoke having two parallel vertical yoke elements of identical geometry spaced apart a distance from each other, and two transverse yoke elements disposed between said vertical yoke elements. The pole shoes, surrounded by disk-shaped magnetic coils, are attached to the center of said transverse yoke elements and oppose each other over a prescribed distance.

Abstract: A magnetic coil arrangement for a magnetic field applicator (1) which heats magnetic or magnetizable substances or solids in biological tissue is disclosed which includes a coolable magnetic yoke (2) with two spaced, opposing pole shoes (7, 8) separated from each other by a exposure volume gap (12) on the magnetic yoke (2). A magnetic coil (22) is assigned to each of the two pole shoes (7, 8) to produce a magnetic alternating field. The magnetic coils are designed as disk coils with helicoidally extending coil windings (39) respectively surrounding the pole shoe end of the assigned pole shoe (7, 8) with a surrounding magnetic coil/pole shoe gap (57). According to the invention, the magnetic coil (22) is respectively arranged in a coil box annularly surrounding the assigned pole shoe (7, 8), with the coil box (9, 10) being provided with at least one cooling air admission port (51, 52, 53) for connection of a cooling air pump and with at least one cooling air discharge port (57, 66).

Abstract: A contactor for establishing electrical communication with organic tissue, the contactor including a cup-shaped housing of one-piece rubbery material including a closing end-wall connected across an annular sidewall with rim defining an open mouth into a main recess. An electrode in the recess comprises a contact plate with first side facing the mouth to contact organic tissue, and a second side with a pair of leg-like extensions and a center limiter post all of one-piece molded plastics coated with a thin layer of conductor preferably silver/silver chloride to be electrically conductive on the exterior surface of the electrode. The legs of the electrode snap fit against to physically and electrically connect with an electrically conductive venturi tube mounted extending through the housing, the venturi tube having a suction port positioned such that when high pressure gas is passed through the venturi tube, a vacuum is created within the housing recess.

Abstract: A magnetic field applicator to heat magnetic substances in biological tissue, having a magnetic yoke with two pole shoes across from each other and separated from each other by a distance that defines the magnetic field exposure volume produced by the applicator, and with two magnetic coils, one assigned to each of the two pole shoes, to produce a magnetic field. The magnetic yoke and the pole shoes consist of ferrite segments assembled together. The pole shoes oppose each other and are surrounded by magnetic disk-shaped coils with one or more windings extending helicoidally, which creates an intermediate air gap between the pole shoes and coils. This results in a magnetic field applicator with the ability to effectively and efficiently administer hyperthermia and thermo-ablation procedures to destroy cancerous tissue in a patient, as well as having uses in other medical and industrial applications.

Abstract: A magnetic field applicator to heat magnetic substances in biological tissue, having a magnetic yoke with two pole shoes across from each other and separated from each other by a distance that defines the magnetic field exposure volume produced by the applicator, and with two magnetic coils, one assigned to each of the two pole shoes, to produce a magnetic field. The magnetic yoke and the pole shoes consist of ferrite segments assembled together. Additionally, the magnetic field applicator is composed of a magnetic yoke having two parallel vertical yoke elements of identical geometry spaced apart a distance from each other, and two transverse yoke elements disposed between said vertical yoke elements. The pole shoes, surrounded by disk-shaped magnetic coils, are attached to the center of said transverse yoke elements and oppose each other over a prescribed distance.

Abstract: A multipart planar electrode, suitable for use as a neutral electrode for an HF surgery device, has four sub-electrodes arranged on one side of a flexible, common carrier. At least three of these sub-electrodes have substantially the same area and at least two of the sub-electrodes have a limiting edge disposed parallel to and adjacent at least a portion of a separate edge of one of the remaining sub-electrodes. This insures that, if one of the sub-electrodes is used as an auxiliary electrode for a symmetry measurement of sub-currents, there will not be equality of the contact area of the electrodes with the patient's skin at the remaining sub-electrodes upon the occurrence of a straight-line release edge in an arbitrary direction. Because such equal areas will not occur, this will be detected by the symmetry measurement and an alarm indicating partial detachment of the electrode can be activated.

Abstract: For separating voltage potentials from a handle switch in a circuit for controlling an electro-therapy device, the circuit includes at least one electrode carrying high voltage connected to the switch, with the switch being in series with a rectifier and the series combination being electrically connected to a secondary side of a quadrupole component, which transmits alternating current and blocks direct current. The primary side of the quadrupole component is connected to an alternating current source, the secondary side being voltaically separated from the primary side. Actuation of the switch causes a directionally dependent change in an electrical parameter at the primary side of the quadrupole component. An evaluation unit is connected at the primary side, and is also connected to the electrode. The evaluation unit includes circuitry which is capable of altering the delivery of high voltage (a.c.

Abstract: A neutral electrode for a high frequency surgery device has three planar sub-electrodes, which are arranged side by side on a carrier consisting of insulating material. To improve monitoring of the contact of the sub-electrodes with the body of the patient, the two outer sub-electrodes have substantially triangular contact surfaces, with the respective hypotenuses of the triangular contact surfaces proceeding parallel to and spaced from each other, with a central, strip-shaped sub-electrode disposed between the hypotenuses of the outer sub-electrodes. The neutral electrode is intended for use with a monitoring system which will activate an alarm if the neutral electrode becomes detached from the patient to such an extent that the danger of injury to the patient exists. This is accomplished by monitoring a current or currents flowing through the patient between sub-electrodes.

Abstract: An RF surgical apparatus has an RF power stage, a control circuit for driving the power stage, and an adjustable element for setting a rated value of the output power. To monitor the RF surgical apparatus for the occurrence of an apparatus-caused malfunction, a power measuring unit measures the actual value of the RF power at the output of the RF power stage. Deviations of the actual value from a rated value are monitored. An alarm is generated if the deviation exceeds a selected value. An alarm can be simulated in a test mode by means of an auxiliary circuit.

Abstract: A multi-element electrode comprises at least two flat partial electrodes which are arranged in juxtaposition to a pre-established direction. To simplify the fabrication of such an electrode and in particular to allow the use of cable conductors of equal length for attachment thereto, provision is made for the two partial electrodes to exhibit facing edges which are at an angle to the pre-established direction. Such a construction is advantageous in the case of a three-part electrode. The electrode is preferably the neutral electrode of an HF-surgical apparatus.

Abstract: The HF-current generator of an electrosurgical apparatus has one terminal connected to an active electrode and an additional terminal connected to a neutral electrode. The neutral electrode consists of at least two partial electrodes which are individually connected via connecting leads to respective current meters for measuing the partial currents in the respective connecting leads. The output side of the current meters are connected to a logic element that is provided for combining the partial currents and which provides a logic signal that is a function of their combination. A ratio generator is preferably provided as the logic element to develop a logic signal that is a function of the ratio of the partial currents. A comparator for comparing the logic signal with pre-set limit value is associated with the logic element. The output signal of the comparator is used as an alarm signal to actuate an alarm or a protective means for a patient in contact with the neutral electrode.

Abstract: A split neutral electrode useful for electronic surgery, consists of at least a first and a second partial electrode separated from each other by an insulating strip. An electrical resistance establishes an electrical connection between the partial electrodes. Each partial electrode preferably has a protrusion which is wrapped around and makes forced contact with the resistance. An associated terminal clamp constructed in the form of an alligator clip contains two metal overlays which are brought into contact with the protrusions upon closure of the clamp.