JP4442104B2 - End of endoscope insertion part - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a distal end portion of an endoscope insertion portion, and more particularly to a distal end portion of an endoscope insertion portion in which an illumination lens or the like is disposed on the distal end surface.
[0002]
[Prior art]
The medical endoscope includes an insertion portion that is inserted into a body cavity, and an observation optical member and an illumination optical member are provided at a distal end portion of the insertion portion. The observation optical member and the illumination optical member are housed in the recess of the tip main body constituting the tip, and are fixed by an adhesive.
[0003]
By the way, since an endoscope is immersed in a chemical solution or the like after being used for cleaning or sterilized by an autoclave, there is a problem that the adhesive is likely to deteriorate. When the adhesive deteriorates, the optical member may fall into the body cavity.
[0004]
Patent Document 1 describes a distal end portion in which a first lens of an observation optical member is caulked and fixed to a distal end portion of a lens barrel and the lens barrel is bonded and fixed. According to this distal end portion, since the first lens is caulked and fixed to the lens barrel, it is possible to prevent the lens from dropping due to deterioration of the adhesive.
[0005]
[Patent Document 1]
Japanese Patent Laid-Open No. 9-234183
[Problems to be solved by the invention]
However, since Patent Document 1 uses a lens barrel to fix the lens, there are problems that the observation optical member is large by the amount of the lens barrel and that the lens cannot be arranged near the edge of the tip. . For this reason, Patent Document 1 has a small degree of freedom in lens arrangement, and it is difficult to reduce the diameter of the tip.
[0007]
The present invention has been made in view of such circumstances, and it is an object of the present invention to provide a distal end portion of an endoscope insertion portion that can reliably prevent the lens from falling off and can reduce the diameter of the distal end portion. And
[0008]
[Means for Solving the Problems]
Invention in order to achieve the above object according to claim 1, recess is formed on the distal end surface of the distal end portion main body which constitutes the front end portion of the endoscope insertion portion, the endoscope lens is accommodated in the recess At the distal end portion of the insertion portion, the chamfered portion is formed between the chamfered portion formed at the distal end edge portion of the distal end portion main body, the inner surface of the concave portion, and the outer peripheral surface of the chamfered portion, and the thickness is along the distal end surface direction. A thin wall portion formed continuously and thinly, and the lens forms an inclined surface on a side close to a front edge when accommodated in the recess, and the thin portion is deformed to form the inclined portion. is engaged with the surface, the so said outer circumferential surface position opposed to the inner surface position of the recess in the leading edge side is chamfered position of the chamfered portion, said forming a recess, the tilt at least the thin portion The engaging part of the surface is coated with adhesive and covered by the adhesive. Is, the adhesive material is characterized in that is shaped into the chamfered shape of the chamfered portion.
[0009]
According to the first aspect of the present invention, the lens forms an inclined surface on the side close to the tip edge when housed in the recess, and the thickness is continuously along the tip surface direction. is engaged with the thin walled portion formed can be easily deformed the inclined surface, so that the outer circumferential surface position opposed to the inner surface position of the recess in the leading edge side is chamfered position of the chamfered portion, The concave portion is formed, and at least the engaging portion of the thin portion and the inclined surface is coated with an adhesive and covered with the adhesive, and the adhesive is shaped into a chamfered shape of the chamfered portion, Even when the adhesive is deteriorated, the lens can be prevented from falling.
[0011]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, preferred embodiments of the distal end portion of the endoscope insertion portion according to the present invention will be described in detail with reference to the accompanying drawings.
[0012]
As shown in FIG. 1, the endoscope 10 mainly includes a hand operation unit 12 and an insertion unit 14 connected to the hand operation unit 12. A universal cable 16 is connected to the hand operation unit 12, and a connector (not shown) connected to a processor and a light source device is provided at the end of the universal cable 16.
[0013]
The hand operation unit 12 is provided with an air / water supply button 24, a suction button 26, and a shutter button 28, and angle knobs 32 and 32 and a forceps insertion unit 34.
[0014]
On the other hand, the insertion portion 14 includes a flexible portion 18, a bending portion 20, and a distal end portion 22. The bending portion 20 is remotely bent by turning a pair of angle knobs 32 and 32 provided in the hand operation portion 12. Thereby, the front end surface of the front-end | tip part 22 can be turned to a desired direction.
[0015]
FIG. 2 is a front view showing the distal end surface of the distal end portion 22, and FIG. 3 is a cross-sectional view taken along the line 3-3 in FIG.
[0016]
As shown in these drawings, the distal end portion main body 30 constituting the distal end portion 22 is formed in a substantially cylindrical shape. The distal end portion body 30 is made of a metal material such as stainless steel, and a chamfered portion 30B that is chamfered into a curved surface is formed at the edge portion of the distal end surface 30A.
[0017]
As shown in FIG. 2, an observation optical system 38, illumination lenses 40 and 40, and a forceps channel 44 are provided on the distal end surface 30 </ b> A of the distal end body 30. The illumination lenses 40, 40 are disposed close to the edge (outer peripheral surface 30C) of the distal end body 30, and a part thereof is disposed in the chamfered portion 30B.
[0018]
As shown in FIGS. 3 and 4, the illumination lens 40 is housed in a lens mounting hole 30 </ b> D formed in the tip end body 30. On the bottom surface of the lens mounting hole 30D, a light guide mounting hole 30E is formed with a diameter smaller than that of the lens mounting hole 30D and coaxial with the lens mounting hole 30D. Thereby, a step portion 30F is formed on the bottom surface of the lens mounting hole 30D. The illumination lens 40 is inserted into the lens mounting hole 30D and engaged with the step portion 30F. At that time, the position of the front end surface 40A of the illumination lens 40 matches the position of the front end surface 30A of the front end portion main body 30.
[0019]
In the illumination lens 40, an inclined surface 40B is formed corresponding to the chamfered portion 30B of the tip end body 30. When the inclined surface 40B is arranged at the position of the chamfered portion 30B, the inclined surface 40B is arranged inside the outer surface of the chamfered portion 30B as shown in FIG. A space is formed between the outer surface of the chamfered portion 30B and the inclined surface 40B in which a thin portion 30G, which will be described later, is deformed and disposed.
[0020]
Next, the processing procedure of the tip portion 22 described above will be described with reference to FIGS. 5 (A) to 5 (C). 5A to 5C correspond to the part shown in FIG.
[0021]
First, as shown in FIG. 5A, chamfering is performed on the edge portion of the tip surface 30 </ b> A of the tip body 30. Thus, a curved chamfered portion 30B is formed.
[0022]
Next, as shown in FIG. 5B, a lens mounting hole 30 </ b> D and a light guide mounting hole 30 </ b> E are formed in the tip end body 30. At that time, the lens mounting hole 30D is formed close to the outer peripheral surface 30C, and a part thereof is disposed in the chamfered portion 30B. Thus, a thin portion 30G having a small thickness is formed between the inner peripheral surface of the lens mounting hole 30D and the outer peripheral surface 30C of the tip end body 30. The thin portion 30G is formed to a thickness that can be easily deformed, for example, a thickness of about t = 0.5 mm.
[0023]
Next, the illumination lens 40 is inserted from the front into the lens mounting hole 30D and brought into contact with the stepped portion 30F. At that time, the inclined surface 40B of the illumination lens 40 is arranged on the chamfered portion 30B of the tip end body 30. As a result, as shown in FIG. 5C, the inclined surface 40B is disposed inside the outer surface of the chamfered portion 30B, and the tip of the thin portion 30G protrudes from the inclined surface 40B.
[0024]
Next, the tip of the thin portion 30G is bent toward the illumination lens 40 and brought into contact with the inclined surface 40B as shown in FIG. Thereby, the illumination lens 40 is engaged with the front-end | tip of the thin part 30G.
[0025]
Next, an adhesive 46 is applied along the edge portion of the front end surface 40 </ b> A of the illumination lens 40. Then, the adhesive 46 is also applied on the inclined surface 40B so as to follow the shape of the chamfered portion 30B. Thereby, as shown in FIG. 4, the illumination lens 40 is fixed by the adhesive 46 and the thin portion 30G.
[0026]
Thus, according to the present embodiment, the illumination lens 40 is mechanically fixed by being engaged not only with the adhesive 46 but also with the thin portion 30G. Therefore, even if the adhesive 46 is deteriorated, it is possible to prevent the illumination lens 40 from dropping from the tip end body 30.
[0027]
In addition, according to the present embodiment, utilizing the fact that the thin portion 30G is formed by bringing the lens mounting hole 30D close to the outer peripheral surface 30C of the distal end portion main body 30, the thin portion 30G is deformed to produce an illumination lens. Since 40 is fixed, there is no need to provide a new fixing part or increase the number of processing of the tip body 30. Therefore, the illumination lens 40 can be reliably fixed without increasing the cost.
[0028]
Furthermore, according to the present embodiment, since the illumination lens 40 is directly attached to the tip end body 30, the illumination lens 40 can be disposed close to the edge of the tip end face 30 </ b> A of the tip end body 30. Therefore, the degree of freedom of arrangement of other contents in the central portion of the tip end body 30 increases. In addition, the outer dimension of the distal end portion body 30 can be reduced without changing the arrangement of the contents including the illumination lens 40, and the distal end portion 22 can be reduced in diameter.
[0029]
In addition, although embodiment mentioned above utilized the thin part 30G produced by having arrange | positioned the illumination lens 40 in the vicinity of the outer peripheral surface 30C of the front-end | tip part main body 30 as a deformation | transformation part, it is not limited to this. For example, a plurality of plate-like protrusions 50G and 50G are formed around the illumination lens 52 on the tip surface 50A of the tip body 50 shown in FIG. A taper 52B is formed on the distal end surface 52A of the illumination lens 52, and the distal end of the protrusion 50G is deformed inward as shown in FIG. 6B and engaged with the taper 52B of the illumination lens 52. Thereby, the illumination lens 52 is fixed by the protrusion part 50G. After the illumination lens 52 is fixed, the cap 54 is attached to the distal end surface 50A of the distal end portion main body 50. The cap 54 has a front end surface 54 </ b> A that matches the front end surface 52 </ b> A of the illumination lens 52. After the cap 54 is attached, an adhesive 56 is applied on the tapered surface 52B of the illumination lens 52. Thereby, the illumination lens 52 is fixed by the adhesive 56. As described above, the protruding portion 50 </ b> G for engaging with the illumination lens 52 may be processed in the tip portion main body 50 in advance.
[0030]
Moreover, although embodiment mentioned above fixed the illumination lenses 40 and 52 comprised with a single lens, it is not limited to this, Even if the optical member comprised with a some lens is fixed. Good. FIG. 7 shows an example in which an observation optical system 60 composed of a plurality of lenses is fixed. In the observation optical system 60 shown in FIG. 7, the lens 62 and the lens 64 are fixed by deforming the thin portion 30G of the distal end portion main body 30. That is, after inserting the lens 62, the interval retaining ring 66, and the lens 64 in this order into the lens mounting hole 30D of the distal end portion body 30, the distal end of the thin portion 30G is deformed and engaged with the inclined surface 62B of the lens 62. The lens 62 and the lens 64 are fixed. Thus, according to the present invention, a plurality of lenses 62 and 64 can be fixed simultaneously.
[0031]
【The invention's effect】
As described above, according to the distal end portion of the endoscope insertion portion according to the present invention, the lens forms an inclined surface on the side close to the distal end edge when housed in the recess, and the thickness is the distal end. thin portion which is continuously formed thin along the surface direction is engaged with the inclined surface can be easily deformed, the outer peripheral surface position chamfer of the chamfered portion facing the inner surface position of the recess in the leading edge side The concave portion is formed so as to be a formation position, and at least the engaging portion of the thin portion and the inclined surface is coated with an adhesive and coated with the adhesive, and the adhesive is chamfered on the chamfered portion. Since it is shaped into a shape, the lens can be prevented from falling even when the adhesive is deteriorated.
[0032]
In addition, according to the present invention, since the lens is directly fixed to the tip body, the degree of freedom of lens arrangement is increased, and as a result, the tip can be reduced in diameter.
[Brief description of the drawings]
1 is an overall configuration diagram showing an endoscope to which a distal end portion of an endoscope insertion portion according to the present invention is applied; FIG. 2 is a front view showing a distal end surface of the distal end portion; FIG. 4 is an enlarged view of a portion P in FIG. 3. FIG. 5 is an explanatory view showing the operation of the present invention. FIG. 6 is a portion showing a tip portion having a lens fixing structure different in shape from FIG. Sectional view [Fig. 7] Partial sectional view of the tip with the observation optical system fixed [Explanation of symbols]
DESCRIPTION OF SYMBOLS 10 ... Endoscope, 12 ... Hand operation part, 14 ... Insertion part, 16 ... Universal cable, 18 ... Soft part, 20 ... Bending part, 22 ... Tip part, 24 ... Air supply / water supply button, 26 ... Suction button, 28 ... Shutter button, 30 ... Tip body, 32 ... Angle knob, 34 ... Forceps insertion part, 38 ... Observation optical system, 40 ... Illumination lens, 44 ... Forceps channel, 46 ... Adhesive, 50 ... Tip body, 52 ... illumination lens, 54 ... cap, 56 ... adhesive, 60 ... observation optical system, 62, 64 ... lens, 66 ... interval holding ring

Claims (1)

In the distal end portion of the endoscope insertion portion in which a recess is formed in the distal end surface of the distal end portion main body constituting the distal end portion of the endoscope insertion portion, and the lens is accommodated in the recess,
A chamfered portion formed at the tip edge of the tip body,
A thin-walled portion formed between the inner surface of the recess and the outer peripheral surface of the chamfered portion, and having a thickness that is continuously thinned along the tip surface direction;
With
The lens is an inclined surface formed on the side close to the leading edge when housed in the recess, the thin portion is engaged with the inclined surface is deformed,
Forming the concave portion so that the outer peripheral surface position facing the inner surface position of the concave portion on the tip edge side is the chamfer forming position of the chamfered portion;
The engagement portion between at least the thin portion and the inclined surface is coated with an adhesive and coated with the adhesive, and the adhesive is shaped into a chamfered shape of the chamfered portion. The distal end of the endoscope insertion part.

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