Abstract: A catheter includes a long tubular main body, a window on a side of the main body and transmits light in a predetermined outward direction, and an opening on the side of the main body, the opening being configured to release a fluid. A direction in which the fluid is released from the opening intersects the predetermined outward direction in which light is emitted from the window.

Abstract: A power storage device (non-aqueous electrolyte battery) 1 is constituted of a power generation unit 40 including an anode 10, a cathode 20, and an electrolyte (non-electrolyte) 30, a sealing bag 50 enclosing the power generation unit, an anode lead 12, and a cathode lead 22. The sealing bag 50 includes a first sheet 51 and a second sheet 52, which are composed of a composite packaging material and face each other, and includes a pair of spacers 60 made of synthetic resin for securing space accommodating the power generation unit. The spacers are arranged between a face F51 of the first sheet facing the second sheet and a face F52 of the second sheet facing the face F51, and individually arranged at positions on edges of the face F51 facing each other.