ULTRASONIC ENDOSCOPE
FIG8 is an external perspective view of a distal end rigid portion of an insertion section according to a second embodiment
FIG8 is an external perspective view of a distal end rigid portion 134 of an insertion section of an ultrasonic endoscope according to a second embodiment. The distal end rigid portion 134 according to the second embodiment differs from the distal end rigid portion 34 according to the first embodiment in that the distal end rigid portion 134 does not have a standing wall portion and a light-guiding recessed wall portion. In embodiments described below, elements that are the same those of the first embodiment will be denoted by the same numerals and description of such elements may be omitted. Even without a standing wall portion, in the positional relationship between an opening 158 from which a treatment tool is led to the outside and the observation window 44, by locating the position of the opening 158 on the distal end side relative to the observation window 44 in the distal end rigid portion 34 and locating, in the first direction indicated by arrow A in FIG8, a one-side opening position, which is the position of an end portion of the opening that is furthest toward the one-side in the first direction, below an axis 145 of the observation window 44, a treatment tool led out from the opening 158 can be placed within the field of view of the observation window 44. The axis 145 of the observation window 44 is a line extending from the center position of the observation window 44 toward the distal end side, and is a line that is parallel to an axis 138 of the distal end rigid portion 134. In the first direction indicated by arrow A in FIG8, when the position of an end portion of the opening 158 that is furthest toward the other side in the first direction is defined as an other-side opening position, and the position of a vertex of the ultrasound transmitting/receiving surface 52 of the ultrasonic transducer 50 that is located furthest toward the one side in the first direction is defined as a vertex position, the vertex position is identical to the other-side opening position or is located on the one side in the first direction relative to (above) the other-side opening position. With such a structure, as with the first embodiment, a treatment tool can be led out so as to be close to the ultrasonic transducer 50.
perspective view
158
opening
52
ultrasound transmitting/receiving surface
90
stent
145
axis
68
standing wall portion
136
end rigid portion body
48
air/water supply nozzle
94
body cavity wall
78
deflecting portion
72
observation means forming surface
80
treatment tool lead-out port
96
insertion point
134
distal end rigid portion
44
observation window
62
erecting base housing portion
138
axis
50
ultrasonic transducer
58
opening
60
erecting base
['1. An ultrasonic endoscope comprising: a distal end rigid portion that is located at a distal end of an endoscope insertion section; an ultrasonic transducer that is disposed in the distal end rigid portion; a treatment tool lead-out portion that is disposed on a proximal end side of the ultrasonic transducer and that comprises an erecting base housing portion that has an opening whose opening direction is toward one side in a first direction that is perpendicular to an axial direction of the distal end rigid portion or whose opening direction is a direction that has a component toward the one side in the first direction and a component toward a distal end side in the axial direction of the distal end rigid portion, an opening forming surface in which the opening is formed and that has a normal component in the opening direction, a treatment tool lead-out port that communicates with an inside of the erecting base housing portion and from which a treatment tool is led out, and a treatment-tool erecting base that is disposed in the inside of the erecting base housing portion and that changes a lead-out direction of the treatment tool led out from the treatment tool lead-out port; and an observation window that is disposed on a proximal end side of the opening forming surface and that is disposed in an observation means forming surface that has a normal component toward the distal end side in the axial direction of the distal end rigid portion, wherein, when a position of an end portion of the opening that is furthest toward the one side in the first direction is defined as a one-side opening position, a position of the observation window in the first direction is located on the one side in the first direction relative to the one-side opening position.', '2. The ultrasonic endoscope according to claim 1, wherein the ultrasonic transducer has an ultrasound transmitting/receiving surface that is formed in a curved shape in the axial direction of the distal end rigid portion.', '5. The ultrasonic endoscope according to claim 1, wherein the ultrasonic endoscope has a standing wall portion around the opening, the standing wall portion standing from the opening, and wherein, when a position of an end portion of an upper edge of the standing wall portion that is furthest toward the one side in the first direction is defined as a one-side wall upper end position, the position of the observation window in the first direction is located on the one side in the first direction relative to the one-side wall upper end position.']