JP4608113B2 - Endoscope branch structure - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a structure of an endoscope branch portion, and more particularly to a structure of a branch connection pipe provided at a branch portion between a treatment instrument insertion portion and a main body operation portion.
[0002]
[Prior art]
As described in JP-A-8-238215, an endoscope is inserted through a treatment tool insertion channel through a forceps port provided in a treatment tool insertion portion formed in a main body operation portion, and is inserted through a treatment tool insertion channel. A treatment instrument insertion channel outlet formed at the distal end portion of the endoscope is led out into the body cavity. A branch connection pipe is used to connect the treatment instrument insertion portion and the treatment instrument insertion channel. The branch connection pipe has a very thin wall thickness because the outer diameter is made as small as possible and the inner diameter is made as large as possible in order to ensure the accommodation space at the bifurcation and the insertion of the treatment instrument inserted inside. Yes.
[0003]
On the other hand, in recent years, with the development of medical technology, endoscopes have changed from those that are mainly intended for observation to those that are intended for treatment and treatment, and various endoscopic treatment tools have been developed accordingly. Yes. Some of these new development of the treatment instrument, and those having a warp portion to the distal end rigid portion, or there is that there is no margin in the size of the treatment tool outer diameter as the inner diameter of the branch connecting pipe, when the treatment instrument insertion In addition, there are those whose tip part interferes with a burr part at the outlet of the branch connection pipe or a step with the treatment instrument insertion channel.
[0004]
FIG. 5 is a diagram schematically showing the relationship between a conventional branch connection pipe outlet and a treatment instrument. As shown in FIG. 5A, the vicinity of the outlet of the conventional branch connection pipe 50 has an inner diameter T1 and an outer diameter T2, and the inner diameter is T3 toward the outlet in order to improve deburring or insertion. A taper portion 51 is formed so as to expand to a maximum. Further, the taper 51 is formed substantially uniformly over the entire periphery near the outlet. That is, in the vicinity of the outlet of the conventional branch connection pipe 50, the central axes of the inner diameters T1, T3 and the outer diameter T2 form substantially the same common axis.
[0005]
Now, paying attention to the tapered portion 51 formed in the vicinity of the outlet of the branch connection pipe 50, since the thickness of the branch connection pipe is small, as shown in FIG. Thus, a tapered portion 53 having a length of is formed. When the tapered portion 53 formed near the outlet of the branch connection pipe 52 is large, the treatment tool 60 moves along the tapered portion 53 as shown in FIG. The warping of the distal end portion of the instrument 60 may interfere with the end surface portion having a difference between the inner diameter T3 and the outer diameter T2 at the distal end portion, and the treatment instrument 60 may be difficult to come off.
[0006]
For this reason, as shown in FIG. 5 (d), it is considered that the chamfered portion 56 is formed at the tip of the tapered portion 55 formed in the vicinity of the outlet of the branch connecting pipe 54 to reduce interference at the end face portion. It is done. However, due to the wall thickness restrictions as described above, the chamfering must be extremely small such as deburring. As a result, the warping of the distal end portion of the treatment instrument 60 also interferes with the end surface portion.
[0007]
FIG. 6 is a diagram schematically showing the relationship between the branch connection pipe outlet having a large wall thickness and the treatment instrument. In order to solve the above-mentioned problems caused by the small thickness as in the branch connection pipe shown in FIG. 5, the outer diameter T2 is made smaller than that of the conventional branch connection pipe outlet as shown in FIG. 6 (a). A method of increasing the thickness, that is, increasing the difference between the inner diameters T1 and T3 and the outer diameter T2 and securing a thick wall is conceivable.
[0008]
Furthermore, a chamfered portion (tip tapered portion) 71 that is sufficiently large such that the angle θ of the outlet inclined surface is in the range of, for example, 45 degrees to 60 degrees with respect to the central axis O2 of the outer diameter at the distal end portion of the branch connection pipe outlet. As shown in FIGS. 6 (b), 6 (c) and 6 (d), the distal end portion does not act as a step as shown in FIG. Can be passed. FIGS. 6B, 6C, and 6D are explanatory diagrams sequentially showing the operation of returning the treatment instrument 60 into the endoscope.
[0009]
However, simply increasing the wall thickness and securing a large chamfered portion (tip tapered portion) 71 may cause problems such as expansion of the outer diameter T2 and interference with other contents, or the tube of the treatment instrument insertion channel. Problems such as non-installation may occur. In addition, increasing the outer diameter of the tube of the treatment instrument insertion channel so that it can be attached is due to the nature of the endoscope used in a narrow space such as the inside of the human body. Doing so is not preferable.
[0010]
[Problems to be solved by the invention]
The present invention has been made in view of the above-described problems of the structure of the conventional endoscope branching portion, and an object of the present invention is to provide various treatment tools without increasing the outer diameter of the branch connection pipe. It is an object of the present invention to provide a new and improved endoscope branch structure that can be moved and operated smoothly.
[0011]
[Means for Solving the Problems]
In order to solve the above-described problems, according to the present invention, a branch connection pipe provided at a branch portion at a branch portion between a treatment instrument insertion portion and a main body operation portion of an endoscope and having a connection portion to a treatment instrument insertion channel. The structure of the endoscope branching portion is provided in which the center of the treatment instrument insertion channel side outlet inner diameter is eccentric to the treatment instrument insertion section side with respect to the center of the outlet outer diameter. Furthermore, it is preferable that a portion of the outlet opposite to the treatment instrument insertion portion is formed in a tapered shape so that the inner diameter increases toward the outlet. The tapered portion of the outlet is preferably formed so as to have a taper angle of 45 degrees or more and 60 degrees or less with respect to the central axis of the treatment instrument insertion channel outlet outer diameter.
[0012]
In the present invention, the purpose of decentering the center of the treatment instrument insertion channel side outlet inner diameter toward the treatment instrument insertion section with respect to the center of the outlet outer diameter is expressed from the treatment instrument insertion section in terms of function. It should be noted that when inserting and removing the treatment tool, the portion to which the pressing force of the treatment tool is applied is made thick.
[0013]
In addition, the “tapered portion” referred to in the present invention includes a tapered portion formed in order to improve the insertion property of the treatment instrument in the vicinity of the outlet and a so-called chamfered portion (tip tapered portion) formed at the distal end of the outlet. Both shall be included. In addition, the “part opposite to the treatment instrument insertion portion” referred to in the present invention is expressed from the positional relationship between the treatment instrument insertion portion and the taper portion. This corresponds to a portion to which the pressing force of the treatment tool is applied when inserting / removing from the treatment tool insertion portion.
[0014]
According to such a configuration, the chamfered portion of the outlet of the branch connection pipe that has become thick due to eccentricity can be made larger, and various types of treatment instruments can be smoothly smoothed without increasing the outer diameter of the branch connection pipe. An endoscope branch structure that can be moved and operated is provided.
[0015]
DETAILED DESCRIPTION OF THE INVENTION
Exemplary embodiments of the structure of an endoscope branching portion according to the present invention will be described below in detail with reference to the accompanying drawings. In the present specification and drawings, components having substantially the same functional configuration are denoted by the same reference numerals, and redundant description is omitted.
[0016]
FIG. 1 is a cross-sectional view showing the structure of an endoscope branching portion according to the present invention. As shown in FIG. 1, an endoscope branching unit 100 according to the present invention includes a main body operation unit 110 and a treatment instrument insertion unit 120 that branches from the main body operation unit 110.
[0017]
A forceps port 128 is provided at one end of the treatment instrument insertion portion 120 so that the treatment instrument can be inserted. Two cylindrical bodies 122 and 124 are connected to the lower part of the forceps port 128. The cylinders 122 and 124 are screwed and fixed coaxially with the forceps port 128, and airtightness is maintained by packing (not shown).
[0018]
The main body operation unit 110 includes a branch connection pipe 150, a treatment instrument insertion channel 156, a suction tube 154, and the like. The branch connection pipe 150 is connected to the cylindrical body 124 and is bent in a dogleg shape so as to guide the treatment instrument inserted from the forceps port 128 to the treatment instrument insertion channel 156.
[0019]
The proximal end portion of the treatment instrument insertion channel 156 is formed with a tapered enlarged diameter portion 159, and a tapered ring 172 is fitted on the outer periphery. Then, the branch connection pipe outlet of the branch connection pipe 150 is inserted into the enlarged diameter portion 159. Furthermore, the treatment instrument insertion channel 156 and the branch connection pipe 150 are connected by screwing the pressing ring 158 from the outer periphery to the screw portion 174 formed in the branch connection pipe so as to be coupled with the taper ring 172. Yes. On the other hand, the opposite side is connected to the suction tube 154. Further, the branch connection pipe 150 is fixed to the frame 140 at a predetermined position of the main body operation unit 110 by a fixing tool (not shown) such as a screw. The suction tube 154 is connected to a pump (not shown), and is used when sucking the liquid accumulated in the affected area or the like through the treatment instrument insertion channel 156 and the branch connection pipe 150.
[0020]
FIG. 2 is an enlarged cross-sectional view of the branch connection pipe 150 according to the present embodiment, FIG. 3 is a cross-sectional view of the branch connection pipe 150 shown in FIG. 2 as viewed from the front end direction, and FIG. It is an expanded sectional view of A part of the branch connection pipe 150 shown in FIG. As shown in FIG. 2, in the branch connection pipe outlet 170 which is the outlet of the branch connection pipe 150 on the treatment instrument insertion channel 156 side, the central axis of the inner diameter is O1, and the central axis of the outer diameter is O2. In the branch connection pipe 150 according to the present embodiment, the central axis O1 is eccentric by T4 on the treatment instrument insertion portion side (upper side in the drawing) with respect to the central axis O2.
[0021]
FIG. 3 is a cross-sectional view of the branch connection pipe 150 shown in FIG. 2 as viewed from the distal end direction, and shows the relationship between the inner diameter and the outer diameter of the branch connection pipe outlet 170. As shown in FIG. 3, the inner diameter of the branch connection pipe outlet 170 is T1, and the outer diameter is T2. In the branch connection pipe outlet 170 according to this embodiment, the central axis O1 of the inner diameter is eccentric by T4 toward the treatment instrument insertion portion (upward in the drawing) with respect to the central axis O2 of the outer diameter. The outer wall opposite to the treatment instrument insertion portion of the connection pipe 150 (the lower side in the figure) can be formed thick even if the outer diameter T2 is the same as in the conventional case where the central axis is substantially the same.
[0022]
Here, let us consider when the treatment tool is pulled out. Due to the structure in which the treatment instrument insertion section 120 is provided to be branched from the main body operation section 110, the pressing force when the treatment instrument inserted into the treatment instrument insertion channel 156 is withdrawn is always opposite to the treatment instrument insertion section 120 (see FIG. 2 downward direction). However, in the branch connection pipe outlet 170 according to the present embodiment, as shown in FIG. 4, the portion 151 corresponding to the lower side of the branch connection pipe 150 can be configured to be thicker than the portion 153 corresponding to the upper side. Therefore, even with the same outer diameter as the conventional one, it is possible to obtain a structure having a strong rigidity against the pressing force of the treatment instrument.
[0023]
Further, in the branch connection pipe outlet 170 according to the present embodiment, as shown in FIG. 4, the portion 151 corresponding to the lower side of the branch connection pipe 150 can be configured to be thicker than the portion 153 corresponding to the upper side. Therefore, as shown in FIG. 4, a large tapered portion 157 can be secured in the vicinity of the outlet. As a result, it is possible to smoothly insert and remove the treatment tool in the vicinity of the outlet. The tapered portion 157 formed in the vicinity of the outlet is intended to facilitate the insertion / extraction of the treatment instrument, and therefore does not need to have a very large taper angle. For example, it can be set to 30 degrees or less. preferable.
[0024]
Furthermore, in the branch connection pipe outlet 170 according to the present embodiment, as shown in FIG. 4, the portion 151 corresponding to the lower side of the branch connection pipe 150 can be configured to be thicker than the portion 153 corresponding to the upper side. Therefore, as shown in FIG. 4, even when the chamfered portion (tip tapered portion) 155 is formed at the outlet tip, a large taper angle θ can be secured.
[0025]
As shown in FIG. 4, the tip portion 155 of the thickened portion 151 below the branch connection pipe outlet 170 according to the present embodiment is formed to have a taper angle θ with respect to the central axis O2 of the outer diameter. Is done. As already explained, if the taper angle θ formed at the distal end portion 155 is too small, it will interfere with the warping of the distal end of the treatment instrument, and if it is too large, it will become an obstacle as a step. However, in the branch connection pipe outlet 170 according to the present embodiment, the portion 151 corresponding to the lower side of the branch connection pipe 150 is configured to be thick, so that the optimum taper angle θ for the chamfered portion (tip tapered portion) 155 is obtained. This makes it possible to secure the operability of the treatment tool.
[0026]
The taper angle θ of the chamfered portion (tip tapered portion) 155 can be appropriately selected according to the design and application of the endoscope, but may be set to 45 degrees or more and 60 degrees or less, for example. preferable. If the angle is 45 degrees or less, the chamfered portion (tip tapered portion) 155 becomes too sensitive as shown in FIG. 5B, which may interfere with insertion / extraction of the treatment instrument. On the other hand, when it is 60 degrees or more, the chamfered portion (tip tapered portion) 155 may act as a step as shown in FIG.
[0027]
The preferred embodiment of the structure of the endoscope branching portion according to the present invention has been described above with reference to the accompanying drawings, but the present invention is not limited to such an example. It will be obvious to those skilled in the art that various changes or modifications can be conceived within the scope of the technical idea described in the claims, and these are naturally within the technical scope of the present invention. It is understood that it belongs.
[0028]
In particular, in the present invention, the purpose of decentering the center of the treatment instrument insertion channel side outlet inner diameter toward the treatment instrument insertion section with respect to the center of the outlet outer diameter is expressed from the treatment instrument insertion section in terms of function. Since the portion to which the pressing force of the treatment tool is applied is configured to be thick when the treatment tool is inserted and removed, the structure of the endoscope branching portion having such a structure belongs to the technical scope of the present invention. I want to understand.
[0029]
In the present invention, the tapered portion formed in the thick portion is not limited to the tapered portion formed in the vicinity of the outlet in order to improve the insertion property of the treatment instrument, but a so-called chamfered portion formed in the distal end of the outlet. (Tip taper part) is also included. In other words, the present invention is intended to make the portion to which the pressing force of the treatment tool is applied thick when inserting and removing the treatment tool from the treatment tool insertion portion. It should be understood that the tapered structure belongs to the technical scope of the present invention.
[0030]
Further, in the above embodiment, the present invention has been described by taking as an example the configuration in which the tapered portions 157 and 155 are formed at the distal end portion 170 of the branch connection pipe 150. However, the present invention is not limited to such an example. The taper portions 155 and 157 may be omitted only by forming the thick portion 151 at the tip portion 170.
[0031]
【The invention's effect】
As described above, according to the present invention, it is possible to increase the chamfered portion of the branch connection tube outlet portion becomes thick by eccentricity, so prevent the catching upon treatment tool insertion, the branch connecting pipe Provided is an endoscope branching structure that can smoothly move and operate various types of treatment instruments without increasing the outer diameter.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view showing a structure of an endoscope branching portion according to the present invention.
FIG. 2 is an enlarged cross-sectional view of a branch connection pipe according to the present embodiment.
FIG. 3 is a diagram showing an inner diameter and an outer diameter of a branch connection pipe outlet.
4 is an enlarged view of a portion A in FIG.
FIG. 5 is a diagram schematically showing a relationship between a conventional branch connection pipe outlet and a treatment instrument.
FIG. 6 is a diagram schematically showing a relationship between a branch connection pipe outlet having a large wall thickness and a treatment instrument.
[Explanation of symbols]
150 Branch connection pipe 151 Thick part 153 Thin part 155 Chamfered part (tapered end part)
157 Tapered portion 170 Branch connecting pipe outlet O1 Branch connecting pipe outlet inner diameter central axis O2 Branch connecting pipe outlet outer diameter central axis T4 Eccentric θ Taper angle

Claims (3)

At the branch between the treatment instrument insertion part and the main body operation part of the endoscope,
The branch of the branch connection pipe provided at the branch part and having a connection part to the treatment instrument insertion channel, the center of the treatment tool insertion channel side outlet inner diameter with respect to the center of the outlet outer diameter, the treatment instrument insertion part side Endoscope bifurcation structure, characterized in that it is eccentric. The endoscope branch portion according to claim 1, wherein a portion of the distal end of the outlet opposite to the treatment instrument insertion portion side of the outlet is tapered so that an inner diameter increases toward the outlet. Structure. The tapered portion at the distal end of the outlet is formed so as to have a taper angle of 45 degrees or more and 60 degrees or less with respect to the central axis of the treatment instrument insertion channel outlet outer diameter. The structure of the endoscope branch portion described.

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