Abstract: A catheter shaft includes a shaft main body having a multi-lumen structure, and at least one reinforcement layer embedded in the shaft main body. When, during a tensile test of pulling a test piece obtained from the catheter shaft under test conditions of a 30-mm distance between chucks and a tensile speed of 300 mm/min, a percentage of change amount in a minimum outer diameter of the test piece after pulling to the minimum outer diameter before pulling at a predetermined position of the test piece is defined as a diameter reduction percentage (%), and a percentage of change amount in an axial-direction dimension of the catheter shaft after pulling to the axial-direction dimension before pulling is defined as an elongation percentage (%), the diameter reduction percentage is 5% or greater when the elongation percentage reaches 100% without breakage of the test piece in the tensile test.

Abstract: A catheter includes a shaft, a first wire wound in a spiral shape around an axis of the shaft, and a second wire wound around the shaft in a direction opposite to that of the first wire in a first portion, and wound around the shaft in a direction identical to that of the first wire in a second portion. Accordingly, it is possible to provide a braided structure and the like having flexibility that differs depending on the area in an axial direction.

Abstract: An electrode catheter includes a catheter shaft including a shaft main body enclosing a first lumen and a second lumen separated from each other, and a reinforcement layer embedded into the shaft main body, an electrode having a ring shape and mounted to an outer peripheral portion of the shaft main body, and a lead wire electrically conductive to the electrode and inserted into the first lumen. The reinforcement layer has conductivity and, inside the electrode, surrounds the second lumen without surrounding the first lumen.

Abstract: A process is described for converting glycol dialkyl ether without substantial formation of olefin oligomers by reaction with water, comprising reacting a feed glycol di-tertiary alkyl ether represented by structural formula (A) with water using a strongly acidic cation-exchange resin as a catalyst and a reaction temperature of from 40.degree. C. to 150.degree. C. under a pressure of from 1 to 70 kg/cm.sup.2 (absolute pressure) in a molar ratio of water/feed glycol di-tertiary alkyl ether represented by the structural formula (A) of from 0.

Abstract: A process for producing an infusible and insoluble granular sulfurized material by reacting a petroleum heavy material and sulfur with stirring in the presence of a reaction medium and further in the presence of, if necessary, an infusible and insoluble solid material, and, further, a process for producing granular carbon comprising carbonizing the granular sulfurized material produced above or alternatively a process for producing granular activated carbon comprising carbonizing and activating the granular sulfurized material.