JPS6323041Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a mounting structure for an intraoral insertion tube in a rigid endoscope having a curved portion. The conventional rigid scope is
Generally, it is straight and rod-shaped, and the intraoral insertion tube is also a simple rod-shaped hollow cylindrical metal pipe, and the lens holding tube with a built-in observation optical system inserted into the intraoral insertion tube is also inserted into the oral cavity. It was installed by dropping it in the axial direction from the open end of the insertion tube. However, since the inside of the oral cavity is curved, if the part inserted into the oral cavity is rod-shaped, it will cause pain to the subject, and it will also be difficult to observe the subject in their natural state. Therefore, in order to eliminate such pain for the subject and to enable observation in as natural a state as possible, the applicant of the present application smoothly and easily passes the tip of the intraoral insertion tube from the subject's upper dentition past the epiglottis. We are developing a rigid scope with a curve that allows it to reach the supraglottis.

However, in the above-mentioned rigid scope, the tip of the intraoral insertion tube is curved, so when inserting the lens holding tube into the intraoral insertion tube, it is impossible to use the conventional drop-in method. The lens holding tube must also be curved according to the degree of curvature of the intraoral insertion tube, and therefore the optical axis of the observation optical system inside the lens holding tube must also be curved. It is quite difficult to adjust the intraoral insertion tube during assembly, and it is desirable that the mounting structure of the intraoral insertion tube be one that allows easy insertion of the lens holding tube and adjustment of the observation optical system.

In addition, in conventional rigid endoscopes, due to structural inconveniences, the optical fiber bundle for illumination is arranged in one place in the axial direction on the outer circumferential surface of the lens holding tube, so the range that can be illuminated is There is also the problem that it is difficult to observe because it is lopsided.

The present invention has been made in consideration of the above problems, and aims to provide an attachment structure for an intraoral insertion tube which makes it easy to insert the lens holding tube and adjust the observation optical system, and furthermore makes it easy to arrange the optical fiber bundle for illumination on the outer peripheral surface of the lens holding tube, and which does not bias the illuminated area.

An embodiment of the present invention will be described below with reference to the drawings.

First, an outline of a rigid endoscope having a curved portion will be explained according to FIG. FIG. 1 is a cross-sectional view showing the entire rigid scope having a curved part. An intraoral insertion tube 3 also connected in the axial direction at the other end of the rigid scope main body 1
and a grip part 4 which is connected in a direction perpendicular to the axial direction of the rigid scope body 1 on one side of the rigid scope body 1, and the tip of the intraoral insertion tube 3 is connected to the subject's upper teeth. The intraoral insertion tube 3 is curved in such a way that it can easily and smoothly reach the supraglottis from the epiglottis, and the entire intraoral insertion tube 3 is covered with a synthetic resin tube 5.

To explain the internal structure of the above-mentioned rigid scope, the grip part 4
The optical fiber bundle 6 for illumination passing through the
They are arranged in four bundles on the outer circumferential surface of the lens holding tube 7 inserted into the rigid scope body 1 and the intraoral insertion tube 3, and are arranged around the objective lens frame 8 provided at the tip of the intraoral insertion tube 3. They are arranged in an annular shape, and light from a light source device (not shown) illuminates the test site via an optical fiber bundle 6 for illumination.

Furthermore, an observation lens system 9 is disposed inside the lens holding tube 7, and the observation lens system 9 has the same optical axis as the eyepiece 10 disposed in the eyepiece section 2, and the optical axis of the curved portion is A prism 11 for bending the light is disposed, and the test site illuminated by the illumination optical fiber bundle 6 is observed from the outside via an objective lens, an observation optical system 9, and an eyepiece 10.

Next, a description will be given of the mounting structure of the intraoral insertion tube in the rigid endoscope having the above-mentioned curved portion. Figure 2 a is
The front view and FIG.
is divided into two parts as shown in Fig. 2b. The reason why the intraoral insertion tube 3 is split into two parts is because if the intraoral insertion tube 3 is a one-piece hollow metal pipe as in the past, the tip of the insertion tube 3 is curved. This is because the lens holding tube 7 cannot be installed inside the insertion tube 3 with this method.
Also, if you try to force it, the outer diameter will become larger than necessary. FIG. 3 is a front view with the upper half cut away showing the installed state of the intraoral insertion tube 3 with the lens holding tube 7 attached therein.The installation structure of the intraoral insertion tube 3 is described in the following sections. It is indicated by

The tip of the intraoral insertion tube 3 is fixed to the rear end of the objective lens frame 8 with a screw. That is, as shown in FIG. 4, on the outer periphery of the rear end of the objective lens frame 8,
Recesses 12 for passing the optical fiber bundle 6 for illumination and convex portions 13 that fit into the inner circumferential surface of the intraoral insertion tube 3 are provided alternately at angular intervals of 90° around the optical axis. In the convex portion 13,
The tip of the intraoral insertion tube 3 and the objective lens frame 8 are fixed with a screw 14.

The middle part of the intraoral insertion tube 3 is a lens holding tube 7.
It is fixed with a screw. That is, as shown in FIG. 5, the outer circumferential surface of the middle part of the lens holding tube 7 has a concave portion 16 for passing the optical fiber bundle 6 for illumination and a convex portion that fits into the inner circumferential surface of the intraoral insertion tube 3. portions 15 are formed alternately at angular intervals of 90 degrees around the optical axis, and in the convex portions 15, the midway portion of the intraoral insertion tube 3 and the lens holding cylinder 7 are connected with screws 17. It is attached.

The proximal end of the intraoral insertion tube 3 is pressed and held by the rigid endoscope body 1. That is, as shown in FIG. 6, the proximal end of the intraoral insertion tube 3 and the lens holding tube 7
A protrusion 1a connected to the rigid endoscope main body 1 is fitted and inserted at an angular interval of 90° around the optical axis, and the protrusion 1a is connected to the rigid endoscope main body 1 at an angular interval of 90°, and A connecting ring 18 is arranged to connect the base end portion and the rigid endoscope main body 1. The connecting ring 18 is screwed to the rigid scope main body, and its relationship with the proximal end of the intraoral insertion tube 3 is determined by the tip of a set screw 19 screwed into the connection ring 18. The base end portion of No. 3 is pressed, and the base end portion is held between the protrusion portion 1a and the protrusion portion 1a. Incidentally, an illumination optical fiber bundle 6 is inserted into the space 20 formed between the projections 1a.

Furthermore, to explain the arrangement of the optical fiber bundle 6 for illumination, the optical fiber bundle 6 for illumination that has passed through the grip part 4 is formed between the projections 1a at the base end of the intraoral insertion tube. The central part of the intraoral insertion tube 3 passes through the recesses 16 formed in the lens holding cylinder 7, and the tip of the intraoral insertion tube 3 passes through the objective lens. The light passes through each of the recesses 12 formed in the lens frame 8 and is gathered and bonded in a ring shape around the objective lens frame 8 at the tip of the objective lens frame 8, that is, on the illumination light exit side.

As described above, according to the present invention, the intraoral insertion tube is split into two parts so that it is easy to incorporate the lens holding tube, and the fastening position of the intraoral insertion tube can be attached and removed. The proximal end is clamped against the rigid endoscope body, making it easy to attach and remove, making it easy to repair or readjust the observation optical system inside the lens holding tube during assembly. In addition, a certain space is formed between the intraoral insertion tube and the lens holding tube so that the illumination optical fiber bundle can be arranged well in an annular shape around the lens frame at the tip. The work of arranging the optical fiber bundle for illumination around the lens holding tube, which conventionally took time, can be done extremely easily, and the range of illumination of the bundle of optical fibers for illumination can also be expanded, making it extremely practical.

[Brief explanation of the drawing]

Fig. 1 is a sectional view showing the entire rigid endoscope having a curved part, Fig. 2a is a front view showing the state before the intraoral insertion tube is attached, Fig. 2b is its sectional view, and Fig.
The figure is a front view with the upper half cut away showing the attached state of the intraoral insertion tube with the lens holding tube attached inside, FIG. 4 is a sectional view taken along line A-A in FIG.
BB sectional view in the figure, and FIG. 6 is a CC sectional view in FIG. 3. 1: Rigid scope main body, 3: Intraoral insertion tube, 6: Optical fiber bundle for illumination, 7: Lens holding tube, 8:
Objective lens frame, 9: observation lens system, 18: connection ring.

Claims (1)

[Scope of utility model registration request] The intraoral insertion tube is split into two so that it is easy to incorporate a lens holding tube with an observation optical system therein, and the intraoral insertion tube is attached at a fixed position so that it can be removed; The proximal end of the intraoral insertion tube was pressed against the rigid endoscope body, and a certain space was formed between the intraoral insertion tube and the lens holding tube for arranging an optical fiber bundle for illumination. A mounting structure for an intraoral insertion tube in a rigid endoscope having a curved part.