US 12,262,876 B2
Endoscope
Toshiki Watanabe, Tokyo (JP)
Assigned to HOYA CORPORATION, Tokyo (JP)
Appl. No. 17/267,863
Filed by HOYA CORPORATION, Tokyo (JP)
PCT Filed Feb. 27, 2020, PCT No. PCT/JP2020/008093
§ 371(c)(1), (2) Date Feb. 11, 2021,
PCT Pub. No. WO2020/195518, PCT Pub. Date Oct. 1, 2020.
Claims priority of application No. 2019-061431 (JP), filed on Mar. 27, 2019.
Prior Publication US 2021/0177249 A1, Jun. 17, 2021
Int. Cl. A61B 1/00 (2006.01); A61B 1/05 (2006.01); A61B 1/12 (2006.01)
CPC A61B 1/125 (2013.01) [A61B 1/00091 (2013.01); A61B 1/05 (2013.01)] 7 Claims
OG exemplary drawing
 
1. An endoscope comprising:
an insertion portion extending in a longitudinal direction parallel to an insertion direction of the endoscope, the insertion portion having a distally-facing convex distal end and a proximal end on opposite ends of the insertion portion in the longitudinal direction;
a convex observation lens system provided on a distalmost end of the distally-facing convex distal end, wherein
a center of the observation lens system is eccentric to a center axis of the insertion portion in the longitudinal direction, and
a curvature of the observation lens system is continuous with a curvature of the distally-facing convex distal end; and
a nozzle for injecting a cleaning fluid toward the observation lens system and provided on the distally-facing convex distal end at a position proximal to the observation lens system,
wherein the nozzle includes a plurality of outlets from which the fluid is emitted in directions not intersecting with each other such that fluid is emitted from each outlet of the plurality of outlets in directions different from each other and toward a part of the observation lens system except a center of the observation lens system, and
wherein the proximal end of the insertion portion is provided closer to an operation unit of the endoscope than the distally-facing convex distal end of the insertion portion.