Abstract: A double lumen tubing which is adapted for use as a catheter. The tubing accommodates multiple sized guidewires and has increased resistance to kinking. A lumen wall divides the outer tubular wall into the two lumens and has a central arcuate portion shaped to allow insertion of relatively large guidewires through one of the lumens, while still leaving space for smaller guidewires through the other lumen. Resistance to kinking is increased by varying internal diameters or axes of the interior lumen walls to increase the wall thickness of the tubing in selected areas, and by varying the thickness of the wall that divides both lumens in the middle or where the dividing wall meets the outer tubular wall.

Abstract: A double lumen tubing which is adapted for use as a catheter. Both lumens of the double lumen tubing have equal cross-sectional areas to provide equivalent flow volumes through each lumen. The lumen wall which divides the outer tubular wall into the two lumens has a central arcuate portion which is shaped to allow insertion of relatively large guidewires through the lumen while at the same time maintaining equivalent cross-sectional areas for each lumen. Resistance to kinking is increased by varying external diameters of each lumen to increase the wall thickness of the tubing in selected areas and by varying the thickness of the wall that divides both lumens at the two joints where the wall meets the tubular wall.

Abstract: Polymer blends having improved torque transmitting properties are disclosed. The polymer blends include polyetherurethane and a concentration of polyetherester sufficient to provide the polymer blend with a 37.degree. C. dynamic torque value greater than 40% of the polymer blend's 25.degree. C. dynamic torque value. The polymer blend can be thermally processed to form small diameter tubing suitable for general purpose catheters requiring both a high degree of maneuverability and sufficient resiliency to avoid tissue perforation.

Abstract: A magnetic core containing amorphous metal, suitable for use with electrical inductive apparatus, such as transformers. The desired physical dimensions of the magnetic core are maintained, without adversely stressing the core, by a composite, conformal coating applied to the core edges. The composite coating includes a rigid high strength outer structure and a low stress, adhesive inner structure which cooperatively provide mechanical support and stress protection for the magnetic core, while maintaining its configuration.

Abstract: A magnetic core containing amorphous metal, suitable for use with electrical inductive apparatus, such as transformers, and methods of constructing such a magnetic core. The desired physical dimensions of the magnetic core are maintained, without adversely stressing the core, by a composite, conformal coating applied to the core edges. The composite coating includes a rigid high strength outer structure and a low stress, adhesive inner structure which cooperatively provide mechanical support and stress protection for the magnetic core, while maintaining its configuration.

Abstract: Electrical inductive apparatus, such as a transformer, having a core-coil assembly disposed in a tank. The magnetic core of the core-coil assembly includes amorphous metal, and is of the wound, rectangular, jointless construction. A protective and insulative winding tube is disposed about a winding leg of the magnetic core, and an electrical winding is disposed about the winding tube. The winding tube and tank cooperatively support the weight of the electrical winding.