Abstract: An endoscope hood (1) has a cylindrical shape with both ends opened and is mounted on a tip end portion (3) in a longitudinal axis direction of an endoscope (2) provided with an optical system at least including an observation system (5) and a treatment system to be used. The endoscope hood (1) is provided with an endoscope mounting unit (18) having a base end side opening (21) configured to be mounted on the tip end portion (3) of the endoscope (2) and a hood main body (17) having a tip end side opening (10) of which outer diameter perpendicular to the longitudinal axis direction is smaller than the outer diameter of the base end side opening (21), wherein, in a state in which the base end side opening (21) is mounted on the tip end portion (3) and the tip end portion (3) is seen in the longitudinal axis direction, the optical system and the treatment system are located on the inside of the tip end side opening (10).

Abstract: An inner diameter measurement instrument (100) includes a first channel (120) and a second channel (140) respectively communicating with a balloon (110), a fluid injection mechanism (130), a fluid lock mechanism (150), and an amount measurement unit (160). The fluid injection mechanism (130) injects an incompressible fluid into the balloon (110) through the first channel (120) or the second channel (140). The fluid lock mechanism (150) closes the first channel (120) or the second channel (140). The amount measurement unit (160) measures the amount of an incompressible measurement fluid additionally injected after the balloon (110), the first channel (120), and the second channel (140) are filled with the fluid and the fluid lock mechanism (150) closes one of the first channel (120) and the second channel (140), by the fluid injection mechanism (130) through the other of the first channel (120) and the second channel (140).

Abstract: An endoscope hood (1) has a cylindrical shape with both ends opened and is mounted on a tip end portion (3) in a longitudinal axis direction of an endoscope (2) provided with an optical system at least including an observation system (5) and a treatment system to be used. The endoscope hood (1) is provided with an endoscope mounting unit (18) having a base end side opening (21) configured to be mounted on the tip end portion (3) of the endoscope (2) and a hood main body (17) having a tip end side opening (10) of which outer diameter perpendicular to the longitudinal axis direction is smaller than the outer diameter of the base end side opening (21), wherein, in a state in which the base end side opening (21) is mounted on the tip end portion (3) and the tip end portion (3) is seen in the longitudinal axis direction, the optical system and the treatment system are located on the inside of the tip end side opening (10).

Abstract: Release papers (2A, 2B) are bonded to one face of a circuit board (1) via adhesive layers (3A, 3B), so as to cover the adhesive layers. The circuit board (1) is formed of a flexible multilayer board. A nonadhesive portion (4) having no adhesive layers is formed on the portion of the circuit board face located between the adjacent release papers (2A, 2B), and pull-tabs (2Ap, 2Bp) for removing the respective release papers are formed at the end portions of the respective release papers (2A, 2B) located at the nonadhesive portion (4). The pull-tabs are designed so as to face each other preferably at the adhesive portion (4), and the top end portions of the pull-tabs overlap with each other on the circuit board face. With this arrangement, it is possible to recognize the order of removing the respective release papers from the circuit board face.