Abstract: A catheter adapted for mapping near a tubular region of a heart, has an elongated tubular catheter body having proximal and distal ends, an intermediate section distal of the catheter body, and a mapping assembly at the distal end of the intermediate section. The electrode-carrying mapping assembly has a generally circular main segment with a support member having shape-memory, and a generally linear proximal segment which has greater flexibility than either the intermediate section or the generally circular main segment. The generally circular main segment is adapted to releasably anchor itself in the tubular region and to map circumferentially around the tubular region and the generally linear segment is adapted to contact generally along its length heart wall tissue near an ostium of the tubular region.

Abstract: An electrophysiology catheter and method of use for mapping and ablation procedures. The catheter includes a braided conductive member at its distal end that can be radially expanded. The catheter can be used in endocardial and epicardial mapping and ablation procedures.

Abstract: An electrophysiology catheter and method of use for mapping and ablation procedures. The catheter includes a braided conductive member at its distal end that can be radially expanded. The catheter can be used in endocardial and epicardial mapping and ablation procedures.

Abstract: An electrophysiology catheter and method of use for mapping and ablation procedures. The catheter includes a braided conductive member at its distal end that can be radially expanded. The catheter can be used in endocardial and epicardial mapping and ablation procedures.

Abstract: The invention relates to a crosslinkable impregnating dielectric composition comprising a polydiene polyol, a polyisocyanate and a chemically inert liquid filler, (an insulating liquid) characterized in that a sufficient amount of the said liquid filler is used in order to maintain a viscosity of less than 50 mPa s at the impregnation temperature for a period at least equal to 1 day and in order to obtain a tans at 20° C. and at 50 Hz, after complete crosslinking, of less than 0.02. The invention also relates to a process for preparing the said composition.

Abstract: The present invention relates to the use of insulating fluids, selected from the group consisting of aliphatic esters, alkylbenzenes, crosslinkable compositions comprising at least one polydiene polyol, at least one polyisocyanate and at least one chemically inert liquid charge, for the impregnation of the wound coils of self-healing capacitors.

Abstract: Novel dielectric liquids for such electrical components as transformers, capacitors and cables, especially adopted for low temperature applications, comprise immixtures of benzyltoluene, (methylbenzyl)toluene, benzylxylene and (methylbenzyl)xylene, and optionally include the benzyl or methylbenzyl derivatives thereof; these immixtures are facilely prepared by chlorinating a mixture of xylene and toluene and then adding a catalytically effective amount of a Friedel-Crafts catalyst to the medium of chlorination.

Abstract: Novel dielectric liquids for such electrical components as transformers, capacitors and cables, especially adopted for low temperature applications, comprise a mixture of benzyltoluene and (methylbenzyl)xylene isomers, notably a mixture of benzyltoluene/dibenzyltoluene isomers with (methylbenzyl)xylene/di(methylbenzyl)xylene isomers.

Abstract: Benzyltoluene/benzylxylene admixtures, easily prepared via Friedel-Crafts condensation of benzyl chloride with a mixture of toluene and xylene, are useful dielectric oils exhibiting improved rigidity and are well suited for inclusion in voltage transformers, capacitors, electrical cables, and the like.

Abstract: Novel dielectric compositions, well adapted for low temperature applications, include admixture of benzyltoluene, benzylbenzene and the higher homologs thereof, and optionally contain triphenylmethane, ditolylphenylmethane, tolyldiphenylmethane and the higher homologs thereof; the subject novel compositions are prepared by chlorinating a mixture of toluene and benzene and then treating the product of reaction with an inorganic halide.

Abstract: Dielectric liquids are prepared by (a) Friedel-Crafts condensing at least one aromatic halide with at least one aromatic compound in the presence of a catalytically effective amount of ferric chloride, and thereafter deliberately avoiding any downstream destruction/neutralization and/or washing of such ferric chloride catalyst, (b) optionally, removing unreacted reactants from the medium of reaction, and (c) recovering from such medium of reaction a purified dielectric liquid; the subject process is thus environmentally improved by avoiding the generation of aqueous solutions containing contaminating amounts of objectionable organic compounds.

Abstract: Novel dielectrically improved liquid compositions include at least one electrical insulating oil (A), e.g., benzyltoluene or oligomers thereof, and at least one aldehyde (B) containing at least six carbon atoms, or a functionally substituted such aldehyde, e.g., 3-ethoxy-4-hydroxybenzaldehyde.

Abstract: Liquid, non-flammable dielectric compositions especially adapted as insulators/coolants for transformers are comprised of [1] a mixture of polychlorobenzenes, including a major amount of an at least trichlorinated benzene and a minor amount of ortho-dichlorobenzene, and [2] an alkylaromatic hydrocarbon or a partially hydrogenated bi- or terphenyl.

Abstract: Liquid dielectric compositions useful as electrical insulators are comprised of a mixture of a mixed phthalate of isobutyl alcohol and a branched higher alkanol of a diisobutyl phthalate and/or a phthalate of a branched higher alkanol, and wherein the alkyl groups of the constituents contain from 5 to 18 carbon atoms.

Abstract: Liquid, non-flammable dielectric compositions especially adapted as insulators/coolants for transformers are comprised of [1] a polychlorobenzene and [2] an alkylaromatic hydrocarbon.

Abstract: Dielectric compositions comprising benzyl esters of .alpha.-branched chain alkyl-substituted saturated monocarboxylic acids having improved thermal and chemical stability for extended periods of operation under varying conditions are provided.

Abstract: Liquid dielectric compositions useful as electrical insulators are comprised of [1] a liquid dielectric component of known type, in combination with [2] at least one member selected from the group consisting of monocyanophenoxybenzene, monocyanodiphenyl and monocyanoterphenyl.