Abstract: A medical light irradiation device is provided with an elongated main body portion, a light irradiation portion, and a marker portion. The light irradiation portion is provided on one portion of a side surface on a distal end side of a main body portion, and irradiates light towards outside. The marker portion is provided on a distal end side of the main body portion, is radiopaque, and has a shape for identifying the location of the light irradiation portion in a circumferential direction when viewed from the outside.

Abstract: A light irradiation has an elongated shape. The light irradiation device includes laser light sources that emit laser light in a predetermined wave range. The laser light sources emit laser light in a direction intersecting a longitudinal axial direction of the light irradiation device. The laser light sources of the light irradiation device locally transmit the laser light to a particular location of a living body.

Abstract: A light irradiation device is a light irradiation device for medical use having an elongated shape. The light irradiation device includes an optical fiber that transmits light emitted by a light source to a tip portion of the optical fiber. The tip portion of the optical fiber is formed in a bent portion that is bent with respect to an axial direction of a base portion to which the tip portion is connected. The light irradiation device emits light in a direction intersecting the axial direction of the base portion by emitting the light from a tip end of the bent portion in the optical fiber.

Abstract: A light irradiation device having an elongated outer shape includes: an optical fiber for emitting light from its distal end, which has a curved part, in which the distal end is oriented in a direction intersecting with a longitudinal direction of the light irradiation device by the curved part; and a light transmitting holder that retains a shape of the curved part of the optical fiber. The optical fiber has a core, or has the core and an outer surface layer, and the holder has a refractive index smaller than a refractive index of the core or a refractive index of the outer surface layer of the optical fiber.

Abstract: A light irradiation device including an optical fiber and a light transmissive optical path changing member for changing an optical path of light entering from the optical fiber, disposed on a distal side relative to the optical fiber. The optical path changing member includes a proximal side member disposed on a proximal side of the optical path changing member and a distal side member disposed on a distal side of the optical path changing member. The proximal side member and the distal side member are in contact with each other to form a boundary surface, and the boundary surface is inclined relative to a vertical plane of a central axis of the optical fiber.

Abstract: A light irradiation device having an elongated outer shape includes: an optical fiber for emitting light from its distal end, which has a curved part, in which the distal end is oriented in a direction intersecting with a longitudinal direction of the light irradiation device by the curved part; and a light transmitting holder that retains a shape of the curved part of the optical fiber. The optical fiber has a core, or has the core and an outer surface layer, and the holder has a refractive index smaller than a refractive index of the core or a refractive index of the outer surface layer of the optical fiber.

Abstract: A light irradiation device having an elongated shape is inserted into a catheter. The light irradiation device includes a light irradiation portion provided on a distal end side of a light irradiation device for outputting irradiation light to outside, and a large diameter portion positioned distal to the light irradiation portion and having an outer diameter larger than an outer diameter of the light irradiation portion.

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 medical light irradiation device is provided with an elongated main body portion, a light irradiation portion, and a marker portion. The light irradiation portion is provided on one portion of a side surface on a distal end side of a main body portion, and irradiates light towards outside. The marker portion is provided on a distal end side of the main body portion, is radiopaque, and has a shape for identifying the location of the light irradiation portion in a circumferential direction when viewed from the outside.

Abstract: A light irradiation system for medical use includes a catheter having an elongated tube shape and a light irradiation device having an elongated shape and configured to be inserted into the catheter. The catheter includes a light transmitting portion provided at least in a part of a side surface on a distal end side of the catheter and configured to transmit light inside the catheter to outside of the catheter, and a first marker portion being radiopaque and being provided close to the light transmitting portion. The light irradiation device includes a light irradiation portion provided at least in a part of a side surface on a distal end side of the light irradiation device and configured to output irradiation light to the outside, and a second marker portion being radiopaque and being provided close to the light irradiation portion.

Abstract: A catheter according to an embodiment of the present disclosure includes a mesh member, a first hollow shaft, a front end tip, a guiding film, and a core wire. The mesh member has a tubular shape and is radially expandable and contractable. The guiding film is formed with a stretchable material and is disposed on the mesh member, the guiding film having a front end located between a base end of the front end tip and a front end of the first hollow shaft. A thickness of a base end of the guiding film is larger than a thickness of the front end of the guiding film.

Abstract: A catheter according to an embodiment of the present disclosure includes a mesh member, a first hollow shaft, a front end tip, a guiding film, a second hollow shaft, and a core wire. The mesh member has a tubular shape and is radially expandable and contractable. The guiding film is disposed on the mesh member and has a front end located between a base end of the front end tip and a front end of the first hollow shaft. A thickness of the front end of the guiding film is larger than a thickness of a portion where a thickness of the guiding film is the smallest.

Abstract: A catheter including a mesh member having a tubular shape and being radially expandable and contractable, a first hollow shaft connected to a proximal end of the mesh member, a distal end tip, and a core wire. The first hollow shaft includes a distal end side shaft having a distal end connected to the proximal end of the mesh member and a proximal end side shaft having a distal end connected to a proximal end of the distal end side shaft. An opening is provided at the proximal end of the distal end side shaft in a connection portion between the distal end side shaft and the proximal end side shaft. A sealing member covering an outer periphery of the core wire and allowing the core wire to be slidable thereinside is arranged at the distal end of the proximal end side shaft in the connection portion.

Abstract: A ligation device includes a cylindrical inner cylinder having a distal end portion, a slider having a cylindrical shape, attached around the inner cylinder, movable with respect to the inner cylinder along an axial direction of the inner cylinder, and having annular grooves extending along a circumferential direction on an inner peripheral face, and ligation rings attached around the inner cylinder and located in the annular grooves.

Abstract: A ligation device includes a main body and a first ligation ring. The main body has a cylindrical shape. The main body is configured to be attached to an endoscope and to be located on a distal end portion of the endoscope. The main body includes a distal end portion configured to project from a distal end of the endoscope in a longitudinal direction of the main body and includes a first fluid feeding passage with a first opening that opens on a distal end face or an outer peripheral face of the distal end portion of the main body. The first ligation ring is attached to the distal end portion of the main body so as to obstruct the first opening.

Abstract: Provided is a catheter including a hollow shaft, a mesh member having a tubular shape joined to a distal end side of the hollow shaft and capable of radially expanding and contracting, an expanding and contracting functional portion for radially expanding and contracting the mesh member, a distal-end fixed member joined to a distal end side of the mesh member, and a connector joined to a proximal end side of the hollow shaft. The connector is configured to attach to an aspirator, the aspirator being for applying negative pressure in the inside of the hollow shaft.

Abstract: A catheter according to an embodiment of the present disclosure includes a mesh member, a first hollow shaft, a front end tip, a guiding film, a second hollow shaft, and a core wire. The mesh member has a tubular shape and is radially expandable and contractable. The guiding film is disposed on the mesh member and has a front end located between a base end of the front end tip and a front end of the first hollow shaft. A thickness of the front end of the guiding film is larger than a thickness of a portion where a thickness of the guiding film is the smallest.

Abstract: A catheter according to an embodiment of the present disclosure includes a mesh member, a first hollow shaft, a front end tip, a guiding film, a second hollow shaft, a core wire, and a holding member. The mesh member has a tubular shape and is radially expandable and contractable. The guiding film is disposed on the mesh member and has a front end located between a base end of the front end tip and a front end of the first hollow shaft. The second hollow shaft is connected to the front end tip and disposed so as to protrude in a space inside the mesh member toward a base end side. The holding member has a substantially ring-like shape or a substantially C-like shape in a cross-sectional view, and is provided at the core wire so as to cover the second hollow shaft.

Abstract: A catheter according to an embodiment of the present disclosure includes a mesh member, a first hollow shaft, a front end tip, a guiding film, and a core wire. The mesh member has a tubular shape and is radially expandable and contractable. The guiding film is formed with a stretchable material and is disposed on the mesh member, the guiding film having a front end located between a base end of the front end tip and a front end of the first hollow shaft. A thickness of a base end of the guiding film is larger than a thickness of the front end of the guiding film.

Abstract: A catheter including a mesh member having a tubular shape and being radially expandable and contractable, a first hollow shaft connected to a proximal end of the mesh member, a distal end tip, and a core wire. The first hollow shaft includes a distal end side shaft having a distal end connected to the proximal end of the mesh member and a proximal end side shaft having a distal end connected to a proximal end of the distal end side shaft. An opening is provided at the proximal end of the distal end side shaft in a connection portion between the distal end side shaft and the proximal end side shaft. A sealing member covering an outer periphery of the core wire and allowing the core wire to be slidable thereinside is arranged at the distal end of the proximal end side shaft in the connection portion.