Endoscope
An endoscope includes a distal end surface provided at a distal end of an insertion part; an observation window provided on the distal end surface; a nozzle; and a first protective projection, a second protective projection, and a third protective projection disposed at an outer peripheral part of the distal end surface and provided to project forward of the observation window. In all combinations of imaginary planes capable of coming into contact with the first protective projection, the second protective projection, and the third protective projection from a front side, the imaginary planes are disposed forward of the observation window, the imaginary planes are disposed at the same height as or forward of the nozzle, and the observation window and a portion of the nozzle are included within an outer ring region surrounded by the first protective projection, the second protective projection, and the third protective projection.
1. An endoscope comprising:
an insertion part to be inserted into a subject;
a distal end part having a distal end surface provided at a distal end of the insertion part;
an observation window provided on the distal end surface to observe an interior of the subject;
a nozzle provided on the distal end surface to jet a fluid toward the observation window; and
a plurality of protective projections integrally formed with an outer peripheral part of the distal end surface and provided to project forward of the observation window,
wherein the distal end part including the plurality of protective projections is formed of a hard material,
wherein the plurality of protective projections are projected forward of the observation window, the plurality of protective projections have the same height as the nozzle or are projected forward of the nozzle, and
the observation window and at least a portion of the nozzle are included within an outer ring region surrounded by the plurality of protective projections, in plan view of the distal end surface,
wherein the distal end surface has a first surface on which the nozzle is disposed and a second surface which is provided at a projecting part projecting forward from the first surface and on which the observation window is disposed,
wherein the plurality of protective projections comprise a first protective projection, a second protective projection, and a third protective projection, and each of the plurality of protective projections is provided on the second surface,
wherein the nozzle is disposed between the second protective projection and the third protective projection,
wherein the second and third protective projections and the nozzle have the same height.
2. The endoscope according to claim 1 ,
wherein the first protective projection is disposed at a position offset to one side of an imaginary straight line connecting a center of the nozzle and a center of the observation window.
3. The endoscope according to claim 2 ,
wherein the distal end surface has a fluid discharge surface that is provided on a side opposite to the nozzle with respect to the observation window and is inclined rearward as a distance from the observation window increases.
4. The endoscope according to claim 3 ,
wherein the first protective projection is provided at a position adjacent to the fluid discharge surface.
5. The endoscope according to claim 1 ,
wherein the second surface has two extending parts respectively extending from both end parts of an outer peripheral part of the second surface, and
wherein one of the two extending parts is provided with the second protective projection and the other extending part is provided with the third protective projection.
6. The endoscope according to claim 2 ,
wherein the second surface has two extending parts respectively extending from both end parts of an outer peripheral part of the second surface, and
wherein one of the two extending parts is provided with the second protective projection and the other extending part is provided with the third protective projection.
7. The endoscope according to claim 3 ,
wherein the second surface has two extending parts respectively extending from both end parts of an outer peripheral part of the second surface, and
wherein one of the two extending parts is provided with the second protective projection and the other extending part is provided with the third protective projection.
8. The endoscope according to claim 4 ,
wherein the second surface has two extending parts respectively extending from both end parts of an outer peripheral part of the second surface, and
wherein one of the two extending parts is provided with the second protective projection and the other extending part is provided with the third protective projection.
9. The endoscope according to claim 1 ,
wherein the plurality of protective projections are disposed outside an endoscope observation visual field range.
10. The endoscope according to claim 9 ,
wherein the plurality of protective projections are disposed outside a visual field range of the observation window.