JP4021187B2 - End of the endoscope - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a distal end portion of an endoscope.
[0002]
[Prior art]
In an endoscope, in general, a flexible tube inserted and disposed in an insertion portion for allowing fluid to pass is connected and fixed from behind to a flow path provided in a distal end portion main body at the distal end of the insertion portion.
[0003]
FIG. 3 shows an example of the distal end portion of such a conventional endoscope. A connection pipe 93 that protrudes rearward from the flow channel 92 of the distal end portion main body 91 is placed in the distal end of the flexible tube 94. They are inserted and bonded together.
[0004]
[Problems to be solved by the invention]
The length of the distal end main body 91 is determined by the length of the lens frame 96 that supports the objective optical system 95 and the like, and the length of the distal end main body 91 determines the so-called distal hard portion length of the endoscope insertion portion.
[0005]
However, in the distal end portion of the endoscope having the above-described configuration, since the connection pipe 93 protrudes rearward from the distal end portion main body 91, the distal end hard portion becomes longer by that amount, and the endoscopic inspection is performed. The pain given to the recipient increases.
[0006]
Therefore, there is a structure in which the connection pipe 93 is removed and the flexible tube 94 is directly inserted and bonded to the flow path 92 of the distal end main body 91. Since it is difficult to ensure, the distal end main body 91 becomes longer when attempting to ensure reliable connection strength, and eventually the distal end hard portion length becomes longer.
[0007]
Therefore, the present invention can sufficiently secure the connection strength between the flexible tube inserted and disposed in the insertion portion for allowing the fluid to pass therethrough and the flow path of the distal end portion main body, and further, the distal end hard portion length is configured to be short. An object of the present invention is to provide a distal end portion of an endoscope that can be used.
[0008]
[Means for Solving the Problems]
In order to achieve the above object, the distal end portion of the endoscope of the present invention has a flow path in which a flexible tube, which is inserted in the insertion portion to allow fluid to pass through, is provided in the distal end portion body at the distal end of the insertion portion. At the distal end portion of the endoscope connected from the rear side, a countersink-shaped hole having an inner diameter larger than the outer diameter of the flexible tube is formed in the rear end surface portion of the distal end main body. A connecting pipe that is inserted and connected to the tip protrudes from the flow path side of the tip body to the axial position of the countersink-shaped hole, and bonds the inner surface of the flexible tube and the outer surface of the connecting pipe. Are bonded to the inner surface of the counterbored hole.
[0009]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described with reference to the drawings.
FIG. 2 shows the overall configuration of the endoscope. A distal end body 2 containing an objective optical system and the like is connected to the distal end of the flexible tubular insertion portion 1.
[0010]
The operation unit 3 connected to the base end of the insertion unit 1 is provided with an air / water supply operation valve 4 and the like, and an air supplied from the air / water supply operation valve 4 and water are passed through, for example, a tetrafluoroethylene resin tube. An air / water supply tube 5 made of a flexible tube such as the like is inserted through the entire length of the insertion portion 1 and connected to the distal end portion body 2 from the rear.
[0011]
FIG. 1 shows a tip portion main body 2 portion, and an electrically insulating tip cap 1a is attached to the outer surface of the metal tip portion main body 2, and the observation window A and the illumination window B are arranged in the side portion. Is arranged in.
[0012]
In the back of the observation window A, the incident end face of the image guide fiber bundle 8 is disposed at the subject projection position by the roof prism 6 and the objective optical system 7, and in the back of the illumination window B, the exit end of the light guide fiber bundle 9 Is arranged.
[0013]
Reference numeral 10 denotes a lens frame that supports the objective optical system 7 and the incident end portion of the image guide fiber bundle 8, and is inserted into a hole formed in the distal end portion main body 2 in a direction parallel to the axis, and is not shown. It is being fixed to the front-end | tip part main body 2 with the screw | thread.
[0014]
The latter half portion of the air / water supply nozzle 12 arranged toward the surface of the observation window A was perforated in the distal end body 2 in order to allow the air and water sent through the air / water supply tube 5 to pass therethrough. The flow path hole 11 is fixed by soldering or the like, and the rear end surface portion of the distal end main body 2 behind the flow path hole 11 has a countersink shape having an inner diameter larger than the outer diameter of the air / water supply tube 5. A hole 13 is formed.
[0015]
A spiral groove is formed on the outer peripheral surface of the air / water supply tube 5, and a reinforcing metal coil is wound around the spiral groove. However, the air / water supply tube 5 may be a simple flexible tube in which nothing is wound.
[0016]
The connection pipe 15 made of stainless steel pipe to which the air / water supply tube 5 is connected has a leading portion fixed to the inner peripheral surface of the flow passage hole 11 and a rear portion having a countersink shape from the flow passage hole 11 side. It arrange | positions so that it may protrude in the axial line position of the hole 13 of this.
[0017]
Although the rear end of the connection pipe 15 slightly protrudes from the rear end surface of the distal end body 2, the connection pipe 15 may be disposed so as not to protrude at all from the counterbored hole 13. In manufacture, the air / water nozzle 12 and the connection pipe 15 may be integrally formed in advance.
[0018]
The connection pipe 15 is inserted into the distal end portion of the air / water supply tube 5 inserted into the counterbore-shaped hole 13, and the inner surface of the air / water supply tube 5 and the outer surface of the connection pipe 15 are connected. The outer surface of the air / water feeding tube 5 is bonded to the inner surface of the countersink-shaped hole 13.
[0019]
Therefore, even if the length of the bonding allowance to the air / water supply tube 5 (that is, the depth of the substantially counterbored hole 13) is short, a strong connection strength can be obtained, and the length of the tip body 2 needs to be increased. However, it is not necessary to project the connecting pipe 15 to the rear of the tip body 2.
[0020]
In addition, this invention is not limited to the said Example, For example, the air supply / water supply tube 5 may be provided separately for air supply and water supply separately, and this invention is a suction tube. It may be applied to the connection part of the.
[0021]
In addition, although the endoscope of the above embodiment is a side view type, the present invention can be applied to a distal end portion of a front view type or a perspective type endoscope.
[0022]
【The invention's effect】
According to the present invention, the distal end portion of the flexible tube is bonded to the outer surface of the connection pipe on the inner surface, and is bonded to the inner surface of the countersink-shaped hole on the outer surface. Since the connection strength between the flexible tube and the flow path of the tip body can be sufficiently secured, it is necessary to increase the length of the tip body and to project the connection pipe to the rear of the tip body. In addition, the length of the distal end hard portion of the insertion portion can be shortened.
[Brief description of the drawings]
FIG. 1 is a side sectional view of a distal end portion of an endoscope according to an embodiment of the present invention.
FIG. 2 is a side view showing an overall configuration of an endoscope according to an embodiment of the present invention.
FIG. 3 is a side sectional view of a distal end portion of a conventional endoscope.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Insertion part 2 Tip part main body 5 Air supply / water supply tube (flexible tube)
11 Channel hole (channel)
12 Air / Water Nozzle 13 Countersunk Hole 15 Connection Pipe

Claims (1)

In the distal end portion of the endoscope, the flexible tube inserted and disposed in the insertion portion for allowing fluid to pass is connected from the rear to the flow path hole provided in the distal end portion main body of the insertion portion distal end.
A countersink-shaped hole having an inner diameter larger than the inner diameter of the channel hole and larger than the outer diameter of the flexible tube is formed in the inlet portion of the channel hole on the rear end surface portion of the tip body. The leading portion of the connection pipe inserted and connected to the distal end of the flexible tube is inserted and fixed into the flow passage hole, and the rear portion of the connection pipe is inserted from the flow passage hole of the distal end body. It protrudes from the axial position of the counterbored hole, adheres the inner surface of the flexible tube and the outer surface of the connection pipe, and connects the outer surface of the flexible tube and the inner surface of the counterbored hole. A distal end portion of an endoscope characterized by being bonded.

Images