US 12,440,091 B2
Insertion part of electronic endoscope and electronic endoscope
Chong Wang, Beijing (CN); Shibo Fu, Beijing (CN); and Yong Fu, Beijing (CN)
Assigned to HOTWIRE MEDICAL TECH. DEVELOPMENT CO., LTD., Beijing (CN)
Appl. No. 17/289,341
Filed by HOTWIRE MEDICAL TECH. DEVELOPMENT CO., LTD., Beijing (CN)
PCT Filed Feb. 28, 2019, PCT No. PCT/CN2019/076585
§ 371(c)(1), (2) Date Apr. 28, 2021,
PCT Pub. No. WO2020/087821, PCT Pub. Date May 7, 2020.
Claims priority of application No. 201811296593.5 (CN), filed on Nov. 1, 2018.
Prior Publication US 2021/0361143 A1, Nov. 25, 2021
Int. Cl. A61B 1/005 (2006.01); A61B 1/00 (2006.01)
CPC A61B 1/0055 (2013.01) [A61B 1/00133 (2013.01)] 6 Claims
OG exemplary drawing
 
1. An insertion part of an electronic endoscope, characterized by comprising a connection portion, a main hose and a bending portion which are connected sequentially, a front end of the bending portion is provided with a camera, and the connection portion comprises a connection portion shell and a connection portion transmission located in the connection portion shell, wherein
a rear end of the connection portion shell is detachably connected with an operation part of the electronic endoscope, and a front end of the connection portion shell is connected with a rear end of the main hose;
the connection portion transmission comprises connection portion racks as well as a connection portion gear and a connection portion rack guide roller set which are respectively located at opposite sides of the connection portion racks, the connection portion gear is rotatably supported in the connection portion shell, and the connection portion racks are engaged with the connection portion gear; the connection portion rack guide roller set comprises a plurality of connection portion rack guide rollers which are arrayed in a fore-aft direction of the connection portion shell and are rotatably supported in the connection portion shell, and the connection portion racks are slidably supported on the connection portion rack guide rollers;
each connection portion rack has disposed thereon a control rope, and the control ropes pass through the main hose and are connected with the connection portion racks and the bending portion in such a manner of converting fore-aft movement of the connection portion racks into bending of the bending portion;
the connection portion transmission further comprises connection portion roller supporting grooves secured in the connection portion shell, and the plurality of connection portion rack guide rollers are rotatably supported in the connection portion roller supporting grooves;
for the plurality of connection portion rack guide rollers, a distance between the connection portion rack guide rollers located at front and rear ends covers a stroke of the connection portion racks;
the connection portion rack guide rollers are bearings, each bearing has an inner diameter of an inner race of 1.5 mm, an outer diameter of an outer race of 3 mm and a thickness of 3 mm, and a distance between every two adjacent bearings is in a range of 10 to 20 mm;
the connection portion racks create rolling friction with the connection portion rack guide roller set for limiting the movement direction thereof; and wherein,
the connection portion further comprises:
a first limiting member of the connection portion and a second limiting member of the connection portion secured in the connection portion shell and between the connection portion racks, connection portion racks located on two sides of the connection portion gear share the first limiting member of the connection portion and the second limiting member of the connection portion, the first limiting member of the connection portion and the second limiting member of the connection portion are respectively located at rear and front sides of the connection portion gear and define the connection portion racks to move in a fore-aft moving direction, the first limiting member of the connection portion and the second limiting member of the connection portion are used for positioning the connection portion racks with the support of the connection portion gear; and
the connection portion rack is configured to be connected to connection members to insert into the operation part.