WO2013084561A1

WO2013084561A1 - Endoscope

Info

Publication number: WO2013084561A1
Application number: PCT/JP2012/073827
Authority: WO
Inventors: 祐樹三田村; 剛小倉; 俊宏波多野
Original assignee: オリンパスメディカルシステムズ株式会社
Priority date: 2011-12-08
Filing date: 2012-09-18
Publication date: 2013-06-13

Abstract

An endoscope (1) of the present embodiment has: a hard leading end member (4), which has a holding hole (5) for holding an image pickup unit (10) that is a configuration component disposed in an leading end portion (3) of an inserting section (2) of the endoscope (1), and a communication hole (6) that is provided adjacent to the holding hole (5), and which is disposed in the leading end portion (3); a first planned-cut portion (20), which is provided on a first partitioning section (DA1) that partitions the hard leading end member (4) into the holding hole (5) and the communication hole (6); and a second planned-cut portion (21), which is provided on a second partitioning section (DA2) that partitions the hard leading end member into the communication hole (6) and an outer wall (4A) of the hard leading end member (4).

Description

Endoscope

The present invention relates to an endoscope including a distal end hard member disposed in a distal end portion of an insertion portion.

Conventionally, endoscopes have been widely used in the medical field and the like. In the endoscope, in order to reduce repair costs and the like, reuse of a component arranged in a distal end portion, for example, an imaging unit having an imaging element is achieved.

In the case of an imaging unit, a normal endoscope uses a screw or a filler to fix the imaging unit to a hard distal end member that is a main component of the distal end. By performing the removing operation, the imaging unit can be detached from the distal end hard member.

As a related technique related to the reuse of the conventional imaging unit, for example, as shown in Japanese Patent Application Laid-Open No. 2006-15076, a cylindrical fixing member that fixes a CCD holding frame and a lens frame constituting the imaging unit By providing a rupture portion on the peripheral surface and applying a force in the radial direction to break through the rupture portion, the adhesive between the fixing member and the CCD holding frame can be easily peeled off, and the fixing member and the CCD holding frame The structure regarding the imaging device which made it isolate | separate is disclosed.
The distal end of the insertion portion of the endoscope is preferably configured without providing an uneven shape on its peripheral surface in order to smoothly insert into the body cavity, and it is necessary to ensure sufficient strength. It is.

However, in the endoscope described in Japanese Patent Application Laid-Open No. 2006-15076, a groove-shaped fracture portion is provided on the peripheral surface of the fixing member, so that it is a preferable shape for smooth insertion into the body cavity. In addition, sufficient strength cannot be ensured. In addition, there is a problem that the cleaning liquid remains in the destruction portion on the groove after the endoscope is cleaned.

In addition, the endoscope described in Japanese Patent Application Laid-Open No. 2006-15076 is originally intended to separate the fixing member and the CCD holding frame. There is no suggestion about a configuration in which a plurality of holes such as a hole for a light guide and a hole for a treatment instrument insertion channel are provided, and in order to reuse the imaging unit, only the imaging unit is easily taken out. It is not possible.

Therefore, the present invention has been made in view of the above problems, and in order to reuse the component parts without impairing the strength of the tip hard member, the component parts can be easily taken out from the tip hard member. An object is to provide an endoscope.

An endoscope according to an aspect of the present invention includes a holding hole that holds a component that is disposed in a distal end portion of an insertion portion of the endoscope, and a first planned breaking communication hole that is provided adjacent to the holding hole. And a first hard member arranged in the front end portion, and a first pre-breaking partition portion that partitions the holding hole and the first pre-breaking communication hole of the hard tip member. And a second planned fracture portion provided in a second planned fracture portion that partitions the first planned fracture communication hole and the outer wall of the distal end hard member.

Sectional drawing which shows the structure of the front-end | tip part of the endoscope which concerns on one Embodiment of this invention. FIG. 2 is a cross-sectional view taken along line AA of a hard tip member provided in the tip portion of FIG. 1. The figure which shows the modification of the fracture | rupture planned part provided in the front-end | tip hard member of FIG. Explanatory drawing for demonstrating the structure of the planned fracture | rupture part provided in the front-end | tip hard member of FIG. The perspective view which was for demonstrating the effect | action of this embodiment, and looked at the front-end | tip hard member which provided the fracture | rupture planned part from the hand side. The figure which shows the state fractured | ruptured through the planned fracture | rupture part using the taper jig | tool at the front-end | tip hard member of FIG. Sectional drawing which shows the modification of a front-end | tip hard member. The perspective view which looked at the front-end | tip hard member provided with the strip | belt-shaped parameter | index which shows a fracture | rupture position from the hand side. The perspective view which looked at the front-end | tip hard member provided with the triangular-shaped parameter | index which shows a fracture | rupture position from the hand side.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
1 is a cross-sectional view showing a configuration of a distal end portion of an insertion portion of an endoscope according to an embodiment of the present invention, and FIG. 2 is a cross-sectional view taken along a line AA of a distal end hard member provided in the distal end portion of FIG. FIG.

An endoscope 1 according to the present embodiment shown in FIG. 1 includes an insertion portion 2, and the insertion portion 2 is arranged in order from the distal end to a distal end portion 3 having a distal end rigid member 4 and a proximal end side of the distal end portion 3. Although not shown, the bending portion and the flexible tube portion are connected to each other.

The distal end portion 3 includes a distal end rigid member 4 that is a main component of the distal end portion 3, an imaging unit 10 as a component, a channel tube connecting member 15, and a bending piece connecting member 30.

The distal end rigid member 4 that is the distal end portion body is made of resin, and as shown in FIG. 2, the communication hole 5 that is a holding hole for holding the imaging unit 10 and the four communication holes 6 to 6 that form other openings. 8 and.
The communication hole 5 which is a holding hole is a communication hole for inserting and attaching the imaging unit 10. As shown in FIG. 1, the imaging unit 10 includes a lens 11 constituting an observation window 11a, an optical system 12 having a plurality of lenses, and an imaging element 13, and is connected to the proximal end side. A cable 14 is connected. The connection cable 14 extends in the insertion portion 2 and a universal cord (not shown), and is connected to a light source device and a video processor (not shown).

The communication hole 6 constitutes a part of the treatment instrument insertion channel 2A. As shown in FIG. 1, a distal treatment instrument insertion means is inserted into the rear end side of the communication hole 6. The distal treatment instrument insertion means includes a channel tube connecting member 15 and a channel tube 16. The distal end side of the channel tube connecting member 15 is inserted and bonded and fixed using an adhesive or the like. A channel tube 16 is connected to the rear end side of the channel tube connecting member 15. The channel tube connecting member 15 is configured in a cylindrical shape. The channel tube 16 branches in the middle of the insertion portion 2, one end communicates with a treatment instrument insertion port (not shown) located on the proximal side from the insertion portion 2 of the endoscope 1, and the other end stores cleaning water. The air supply / water supply tank and the compressor are connected to the proximal end side from the insertion portion 2 of the endoscope 1. A long treatment tool for performing a treatment in a body cavity or the like is inserted from the treatment tool insertion port, is inserted through the channel tube 16, the channel tube connecting member 15, and the communication hole 6 and protrudes from the distal end side of the endoscope 1.

Although not shown, the two

communication holes

7 and 7 are respectively provided with tip side illumination light transmission means including a glass lens that forms an illumination window from the tip of the insertion portion 2 and a light guide bundle 7A (see FIG. 5). It is a communicating hole for inserting and arranging. Behind these glass lenses, the distal end portion of the light guide bundle 7A disposed in the insertion portion is disposed, and the proximal end side of the light guide bundle 7A is closer to the proximal end side than the insertion portion 2 of the endoscope 1. Connected to the light source device. Thus, the illumination light transmitted from the light source device by the light guide bundle 7A is irradiated to the front side of the distal end portion 3 through the glass lens (illumination window).

The communication hole 8 is provided with a tip-side air / water supply means comprising an observation window cleaning nozzle (not shown), a connection pipe (not shown), and an air / water supply tube 8A (see FIG. 5). It has been. An observation window cleaning nozzle (not shown) is attached to the front end side of the communication hole 8, and a connection pipe (not shown) connected to the air / water supply tube 8A (see FIG. 5) is fitted to the rear end side. The

As shown in FIG. 1, the bending piece connecting member 30 is arranged and fixed immediately after the rear end side of the distal end hard member 4 configured in a cylindrical shape, and the distal end side of the insertion portion 2 is positioned on the proximal end side. The bending piece member 30W located at is connected. Although not shown, the bending portion is formed by a plurality of bending piece members 30W including the bending piece member 30W, and is vertically and horizontally controlled by the operation wire 31 (see FIG. 1) and the bending operation portion of the operation portion. It is designed to bend.

By providing the distal end rigid member 4 having the five communication holes 5 to 8 in this way, the distal end surface of the distal end portion 3 is not shown, but the distal end opening that is the opening of the insertion channel 2A, the observation window 11a, Two illumination windows and an observation window cleaning nozzle are arranged.

In the present embodiment, the communication holes 5 to 8 are provided so that the axial directions of the communication holes 5 to 8 are substantially parallel to each other. However, the present invention is not limited to this. For example, in the axial direction of the communication hole 5 On the other hand, it may be provided such that the axial direction of the other communication hole is inclined.

Further, as shown in FIG. 1, the outer periphery of the distal end rigid member 4 and a plurality of bending piece members 30W in the bending portion are integrally covered so as to form the outer shape of the distal end portion 3 and the bending portion (not shown). A sheath member 17 is provided. The outer periphery of the distal end of the sheath member 17 is fixed to the distal end hard member 4 by a thread winding portion 18. Further, an adhesive 19 is applied so as to cover the outer periphery of the spool 18.

In the endoscope 1 according to the present embodiment, as shown in FIG. 2, the distal end hard member 4 is a part of the inner wall 5 a of the communication hole 5 for holding the imaging unit 10 of the distal end hard member 4. In order to break from the communication hole 6 side, a partition part DA1 which is a partition part to be broken that partitions the adjacent communication hole 5 and the other communication hole 6, and a partition part to be broken that partitions the other communication hole 6 and the outer wall 4A The partition part DA2 is provided with the planned

break parts

20 and 21, respectively.

These

planned fracture portions

20 and 21 are thin-walled portions formed in a direction perpendicular to the axial direction of the communication hole 5 for holding the imaging unit 10 (specifically, the direction of the central axis O shown in FIG. 1). And a weld formed at the time of molding the hard tip member 4.
In addition, when the fracture | rupture scheduled

parts

20 and 21 are comprised by thin wall, this thin part is at least one of the inner wall 5a of the communicating hole 5 in the partition part DA1 which is a scheduled fracture | rupture part, and the inner wall 6a of the communicating hole 6, or a fracture plan You may comprise by the notch groove or notch provided in the at least one of the inner wall 6a and the outer wall 4A of the communicating hole 6 in the partition part DA2 which is a partition part, for example along the center-axis O direction.

The specific configuration of the planned

fracture portions

20 and 21 will be described with reference to FIGS. 3 is a view showing a modification of the planned fracture portion provided on the hard tip member of FIG. 2, and FIG. 4 is an explanation for explaining the configuration of the planned fracture portion provided on the hard tip member of FIG. FIG.

In the present embodiment, as shown in FIG. 2, the planned fracture portion 20 is provided in a partition portion DA1 that partitions the inner wall 5a of the communication hole 5 and the inner wall 6a of the other communication hole 6. The planned fracture portion 20 is a portion other than the communication hole 5 adjacent to the communication hole 6 excluding the planned fracture portion 20 in a direction orthogonal to the axial direction of the communication hole 5 (specifically, the central axis O direction shown in FIG. 1). It is configured as a thin part formed thinner than the thickness of the thinnest part in the partition part that partitions the communication hole and the communication hole 6.

That is, in the direction orthogonal to the axial direction of the communication hole 5, each of the plurality of partition portions that partition the communication hole 6 and the plurality of communication holes adjacent to the communication hole 6 that is the communication hole 6 to be broken of the distal end hard member 4. Among the thicknesses of the thinnest part in the partition part, the thickness of the planned fracture portion 20 of the partition part DA1 between the communication hole 6 and the communication hole 5 provided with the imaging unit 10 is formed to be the thinnest. Yes.
That is, as shown in FIG. 4, the planned fracture portion 20 is a planned fracture portion 20 of the partition portion DA1 between the communication hole 6 where the distal-side treatment instrument insertion means is provided and the communication hole 5 where the imaging unit 10 is provided. The thickness S1 of a certain thin portion is the thickness S2, S3, which is a thin portion between the communication hole 6 and the communication hole 7 provided with the tip side illumination light transmission means, or the communication hole 6 and the tip side air supply / water supply means. It is comprised so that it may become smaller than thickness S4 between the communicating holes 8 in which this is provided.

Further, as shown in FIG. 2, the other planned fracture portion 21 is provided in the partition portion DA2 that partitions the inner wall 6a of the other communication hole 6 and the outer wall 4A, and the thin portion is, for example, a notch. It is configured in the shape of a groove. This notch groove is provided, for example along the central axis O direction on the inner peripheral surface of the inner wall 6a of the communication hole 6 which is a communication hole to be broken. The planned fracture portion 21 is a portion other than the communication hole 5 adjacent to the communication hole 6 except for the planned fracture portion 20 in a direction orthogonal to the axial direction of the communication hole 5 (specifically, the central axis O direction shown in FIG. 1). It is configured as a thin part formed thinner than the thickness of the thinnest part in the partition part that partitions the communication hole and the communication hole 6.

That is, in the direction orthogonal to the axial direction of the communication hole 5, each of the plurality of partition parts that divide the communication hole 6 and the plurality of communication holes adjacent to the communication hole 6 of the distal end hard member 4 excluding the partition part DA 1. In contrast to the thickness of the thinnest part in the partition part, the thickness of the planned fracture portion 21 of the partition part DA2 between the communication hole 6 and the outer wall 4A is formed to be thin.

That is, as shown in FIG. 4, the planned fracture portion 21 is a thin wall thickness S5 that is the planned fracture portion 21 of the partition portion DA2 between the communication hole 6 provided with the distal-side treatment instrument insertion means and the outer wall 4A. However, the thicknesses S2 and S3 are thin portions between the communication hole 6 and the communication hole 7 provided with the tip side illumination light transmission means, and the communication hole 8 provided with the communication hole 6 and the tip side air supply / water supply means. It is comprised so that it may become smaller than wall thickness S4 between.
That is, the thickness of the wall portion that forms the communication hole 6 of the distal end hard member 4 in the direction orthogonal to the axial direction of the communication hole 5 is greater than the thickness of the other portions than the thicknesses of the planned fracture portion 20 and the planned fracture portion 21. Is formed into a thin wall.

In addition, this fracture | rupture plan part 21 is not limited to a notch groove, For example, it is comprised by the notch provided in the inner peripheral surface of the inner wall 6a of the communicating hole 6, for example along the center-axis O direction, or a mere thin wall You may comprise as a part. In addition, when a material such as resin is poured into the mold and the distal end hard member 4 is molded, the planned fracture portion 21 is broken as a weld formed by molding the distal end hard member 4 and joined to the material poured into the mold. It is good also as a structure which is easy to do.

Further, the planned fracture portion 20 may have the same configuration as that of the planned fracture portion 21, for example, as a notch groove 20 a as shown in FIG. 3, or a cut or tip hard member 4. You may comprise as the weld formed at the time of shaping | molding.

Further, the partition part DA1 provided with the planned fracture part 20 or the partition part DA2 provided with the planned fracture part 21 is partly cut so that the length on the base end side in the longitudinal direction (the central axis O direction) is shortened. It is formed lacking and is configured to be easily broken. The length in the longitudinal direction of the partition portion DA1 or the partition portion DA2 is not particularly limited, and may be configured to be easily broken.

Therefore, in the endoscope 1 according to the present embodiment, the tip hard member 4 is provided with the planned

fracture portions

20 and 21 so that, for example, a taper jig having a gently tapered portion is inserted into the insertion channel. Since the stress is concentrated on the planned

fracture portions

20 and 21 by applying a force in the direction in which the diameter of the communication hole 6 is expanded by the tapered portion through the insertion hole 6, the tip end is hard. The partition part DA1 that partitions the communication hole 5 and the communication hole 6 for holding the imaging unit 10 of the member 4 and the partition part DA2 that partitions the communication hole 6 and the outer wall 4A can be broken.

Thereby, the imaging unit 10 can be easily detached from the distal end hard member 4. Moreover, since the peripheral surface of the distal end hard member 4 is not provided with any convex and concave portions, the strength is not impaired and the cleaning liquid does not remain.

In addition, in this embodiment, in order to further remove the imaging unit 10 from the distal end hard member 4 and to remove the adhesive attached to the imaging unit 10 when the removed imaging unit 10 is reused. In order to do this, as shown in FIG. 1, in the contact portion between the imaging unit 10 and the communication hole 5 of the distal end hard member 4, the range of L1 including the fitting portion of the distal end portion of the imaging unit 10, The adhesive is used for the range of L3 on the rear end side, but the adhesive is not used for the range of L2 in the central portion of the imaging unit 10. Thereby, it becomes possible to remove the imaging unit 10 more easily than the configuration in which the entire longitudinal direction of the imaging unit 10 is fixed to the communication hole 5 of the distal end hard member 4 using an adhesive. The adhesive adhering to the unit 10 can be easily removed.

The outer tube 10a that protects the image sensor 13 of the image pickup unit 10 has flexibility, and when the image pickup unit 10 is reused, an adhesive is applied to the end of the exterior tube 10a. When removing the adhesive, the outer tube 10a may tear from the end. Therefore, it is preferable that the range of L2 which does not use an adhesive includes at least the range of 1 mm before and after the end of the outer tube 10a.

Next, operations that are characteristic of the endoscope 1 of the present embodiment configured as described above will be described with reference to FIGS. 5 and 6.
5 is a diagram for explaining the operation of the present embodiment, and is a perspective view of the distal end hard member provided with the planned fracture portion as seen from a slightly oblique direction, and FIG. 6 is the distal end rigid member of FIG. It is a figure which shows the state fractured | ruptured through the planned fracture part using the taper jig | tool to a member.

Now, in the endoscope 1 of this embodiment, in order to reuse the imaging unit 10, an operation of removing the imaging unit 10 from the distal end hard member 4 is performed.
In this case, as shown in FIG. 5, the operator cuts the two light guide bundles 7A and the air / water supply tube 8A in advance at the rear side of the distal end hard member 4, and further, the channel tube. The distal-side treatment instrument insertion means including the connection member 15 and the channel tube 16 is removed from the distal-end rigid member 4 in advance.

Then, the operator inserts the taper jig JM indicated by the dotted line through the communication hole 6 of the distal end hard member 4 from the direction of arrow B in FIG. Thereafter, when a force is applied in a direction in which the diameter of the communication hole 6 is expanded by gradually pushing the taper jig into the communication hole 6, a thin-walled portion and a notch groove formed on the distal end hard member 4 are formed. Stress is applied to the planned

fracture portions

20 and 21. Therefore, as shown in FIG. 6, the planned fracture portion 20 that is thin and has low strength around the communication hole 6 is broken at the fracture portion 20 a, and the fracture portion 21 is also broken at the fracture portion 21 a. It will be.

That is, the partition portion DA1 that partitions the inner wall 5a and the communication hole 6 of the communication hole 5 for holding the imaging unit 10 of the distal end hard member 4 is divided into the partition portion DA2 that partitions the outer wall 4A of the distal end hard member 4 and the communication hole 6. Due to the breakage, it can be broken.

In addition, in this embodiment, in the state where the distal end treatment portion insertion means is removed from the distal end rigid member 4, the fracture scheduled

portions

20, 21 are broken, but not limited thereto, the channel tube 16 is cut, The channel tube connecting member 15 may not be removed from the distal end rigid member 4, and the taper jig JM may be inserted into the channel tube connecting member 15, and the

breakable portions

20 and 21 may be broken through the channel tube connecting member 15.

Further, in the present embodiment, the communication hole in which the fractured

portions

20 and 21 are configured is formed with the communication hole 6 having a larger opening than the other communication holes except the communication hole 5 so that the taper jig JM can be easily inserted. However, the present invention is not limited to this, and the above-described fracture scheduled

portions

20 and 21 may be provided in the communication hole 7 or the communication hole 8. In this case, after removing, for example, the tip side illumination light transmission means or the tip side air supply / water supply means provided in the communication hole in which the

breakable portions

20 and 21 are configured, the taper treatment is performed on the communication hole. The tool JM is inserted, and the

breakable portions

20 and 21 are broken.

Further, in the present embodiment, the taper jig JM is used for breaking the

breakable portions

20 and 21, but not limited to this, for example, the

breakable portions

20 and 21 such as a flathead screwdriver or a plus screwdriver are configured. Any material that can be inserted into the communication hole and can expand the communication hole may be used.

Thereby, the imaging unit 10 can be easily detached from the distal end hard member 4. In this case, since the imaging unit 10 is fixed to the communication hole 6 with an adhesive only in the range of L1 and L3 shown in FIG. 1 in the longitudinal direction, the imaging unit 10 can be easily removed. Of course, the application range of the adhesive is also a minimum necessary range, and the adhesive removal work from the removed imaging unit 10 can be easily performed.

In addition, when using the endoscope 1 of this embodiment, since no convex recessed part is provided in the surrounding surface of the front-end | tip hard member 4 of the front-end | tip part 3, while there is sufficient intensity | strength, the insertion part 2's The insertion into the body cavity can be performed smoothly.
Further, since no convex recess is provided on the outer peripheral surface of the distal end portion 2 of the distal end portion 3, no cleaning liquid remains when the endoscope cleaning process is performed.

Therefore, according to this embodiment, in order to reuse the imaging unit 10 without impairing the strength of the distal end hard member 4, the endoscope 1 that can easily take out the imaging unit 10 from the distal end hard member 4. Can be realized.

In the present embodiment, the distal end hard member 4 is divided into a partition part DA1 that partitions the adjacent communication hole 5 and the other communication hole 6, and a partition part DA2 that partitions the other communication hole 6 and the outer wall 4A. By providing the planned

fracture portions

20 and 21, a part of the inner wall 5 a of the communication hole 5 for holding the imaging unit 10 of the distal end hard member 4 is configured to be broken from the other communication hole 6 side. Even when there are a plurality of other communication holes, the same action and effect can be obtained. A modification of such a hard tip member is shown in FIG.

(Modification)
FIG. 7 is a cross-sectional view showing a modification of the distal end hard member of the present embodiment.
As described in the embodiment, the distal end hard member 4 is provided with a plurality of communication holes 5 to 8. Further, as shown in FIG. 7, a front water supply communication hole (hereinafter referred to as a front water supply hole) 22 is provided in the vicinity of the center of the distal end hard member 4.

As described above, when the distal end hard member 4 of the present modified example has a plurality of other communication holes, the breakable portion 20 is divided into a partition portion DA3 that is a planned breakage partitioning portion that partitions the plurality of other communication holes. This is configured by the planned fracture portion 20A provided and the planned fracture portion 20B provided in the partition portion DA4 which is a planned fracture partition portion that partitions the communication hole 5 for holding the imaging unit 10 from the other communication hole 22.

That is, in the case of this modification, the partition part between the communication hole 5 and the communication hole 6 is the partition part DA3 and the partition part DA4 through the front water supply hole 22 which is the communication hole scheduled to be broken, and this partition part DA3. , DA4 are provided with planned

fracture portions

20A and 20B.

As shown in FIG. 7, the planned fracture portion 20 A is provided in a partition portion DA 3 that partitions the communication hole 6 and the forward water supply hole 22. As shown in FIG. 7, the planned fracture portion 20 B is provided in a partition portion DA 4 that partitions the communication hole 5 and the front water supply hole 22.

Like the planned fracture portion 20, the planned fracture portions 20 A and 20 B are planned to break the distal end hard member 4 in a direction orthogonal to the axial direction of the communication hole 5 (specifically, the central axis O direction shown in FIG. 1). The part which becomes the thinnest part in the partition part which partitions off the communication holes 7 and 8 excluding the communication holes 5 and 6 and the front water supply hole 22 from the communication holes adjacent to the front water supply hole 22 except the

parts

20A and 20B. It is comprised as a thin part formed thinly than the thickness of.

That is, the thickness of the wall portion forming the communication hole 6 and the front water supply hole 22 of the distal end rigid member 4 in the direction orthogonal to the axial direction of the communication hole 5 is more likely to break than the thicknesses of other portions. The wall thickness of 20B is formed thin.

Of course, the

breakable portions

20A and 20B are not limited to the thin-walled portion, and may be formed into a shape such as a notch groove or a cut, or a weld formed when the distal end hard member 4 is molded. You may comprise as.

In this modification, the case where the holding communication hole 5, the communication holes 6, 7 and the front water supply hole 22 for holding the imaging unit 10 are provided as the plurality of communication holes has been described. The modification is not limited to this, and a plurality of other communication holes to be communicated when fractured may be applied to the communication hole.

Next, the operation of this modification will be described with reference to FIG.
In this modification, the operator inserts a taper jig JM (not shown) into the communication hole 6 of the distal end hard member 4 from the direction of the arrow B in FIG. Let
After that, when a force is applied in the direction in which the diameter of the communication hole 6 is expanded by gradually pushing the taper jig into the communication hole 6, first, the taper jig is formed by a thin portion and a notch provided on the distal end hard member 4. The stress concentrates on the planned fracture portion 21 and the

planned fracture portions

20A and 20B. For this reason, as shown in FIG. 7, the communication hole 6 spreads in the direction of arrow D in FIG. 7, and the planned fracture portion 21 is broken, and then the partition portion DA 3 that partitions the communication hole 6 and the front water supply hole 22 is broken. The planned portion 20A will break.

Thereafter, when the communication hole 6 is further expanded, the front water supply hole 22 expands in the direction of the arrow C in FIG. 7 in conjunction with the expansion of the communication hole 6 to partition the communication hole 5 and the front water supply hole 22. The planned fracture portion 20B of DA4 will break.
That is, the fracture | rupture planned

part

21, 20A, 20B fractures | ruptures, and the communicating hole 6, the front water supply hole 22, and the communicating hole 5 will connect.
Thereby, the imaging unit 10 can be easily detached from the distal end hard member 4 as in the above-described embodiment.

Therefore, according to the present modification, even when the distal end hard member 4 has a plurality of other openings, it is possible to obtain the same effect as that of the above embodiment by providing the second planned fracture portion 20A. Become.

In addition, in the hard tip member described above, the rupture portion such as a notch groove may not be formed in the rupture planned portion, and the rupture planned portion may be simply formed with a thin wall. It does not have to be formed. In this case, in order to show the breakage point to the worker, for example, an indication such as “break from here” or “breakable from this position” may be shown to the worker.

An example of this index is shown in FIGS. FIG. 8 is a perspective view of the distal end hard member provided with the band-shaped index indicating the breaking position as viewed from the hand side. FIG. 9 is a perspective view of the distal end hard member provided with a triangular index indicating the breaking position as viewed from the hand side.

A colored band-shaped indicator MK1 as shown in FIG. Also, a colored (shown by hatching) triangular index MK2 as shown in FIG. 9 is provided on the distal end hard member. Such an index is given to the hard tip member, for example, when the hard tip member is molded or when the endoscope is assembled.

As described above, according to the endoscopes of the above-described embodiment and the modified example, in order to reuse the component parts without impairing the strength of the tip hard member, the component parts can be easily taken out from the tip hard member. be able to.

The present invention is not limited to the above-described embodiments and modifications, and various changes and modifications can be made without departing from the scope of the present invention.

This application is filed on the basis of the priority claim of Japanese Patent Application No. 2011-269202 filed in Japan on December 8, 2011. The above disclosure is included in the present specification and claims. Shall be quoted.

Claims

A holding hole for holding a component disposed in the distal end portion of the insertion portion of the endoscope; and a first scheduled break-through hole provided adjacent to the holding hole, and disposed in the distal end portion. A hard end member
A first planned fracture portion provided in a first planned fracture portion that partitions the holding hole of the distal end hard member and the first planned communication hole;
A second planned fracture portion provided in a second planned fracture portion that partitions the first planned fracture communication hole and the outer wall of the distal end hard member;
An endoscope characterized by comprising:
The hard tip member is
A second break planned communication hole adjacent to the first planned break communication hole;
The first planned break portion includes a third planned break portion provided in a third planned break portion that partitions the holding hole and the second planned break communication hole, and the first planned break communication portion. A fourth planned break portion provided in a fourth planned break portion that partitions the hole and the second planned break communication hole;
The endoscope according to claim 1, further comprising:
Each of the planned breaks is
The thickness of the flesh portion forming the fracturing planned communication hole in the direction perpendicular to the axial direction of the holding hole is a thin portion in which the thickness of the fracturing portion is thinner than the thickness of the other part,
A weld formed at the time of molding the tip hard member;
The endoscope according to claim 1, wherein the endoscope is configured by any one of the above.
The endoscope according to claim 3, wherein the thin-walled portion is formed by a notch groove or a cut provided in at least one of the walls constituting the planned breaking partition portion.
The endoscope according to any one of claims 1 to 4, wherein the component held in the holding hole includes at least an image sensor.
The endoscope according to any one of claims 1 to 5, wherein the component held in the holding hole is fixed to the distal end hard member by adhesion.
The front end portion and the rear end portion of the component held in the holding hole are fixed to the front end hard member by an adhesive for the bonding, and the center of the component between the front end portion and the rear end portion is fixed. The endoscope according to claim 6, wherein the portion is not fixed to the distal end hard member by the adhesive.
The endoscope according to any one of claims 1 to 7, wherein the first fracture-scheduled communication hole constitutes a part of a treatment instrument insertion channel of the endoscope.
The endoscope according to any one of claims 1 to 8, wherein the hard tip member is formed of a resin.