JPH09253033A - Treating tool insertion channel for endoscope - Google Patents

Abstract

PROBLEM TO BE SOLVED: To surely fix a treating tool insertion tube to the state of being communicated with a treating tool passage. SOLUTION: At the time of connecting the treating tool passage 21 for constituting this treating tool insertion channel 20 and the treating tool insertion tube 22 which is a flexible member through a mouth piece 23, a ring 24 for fixation is fixed to the mouth piece 23, a thin part 23b is formed at the mouth piece 23, an annular clearance 26 for connection is provided between the ring 24 for the fixation and the mouth piece 23 and an elastic piece 25 for locking is formed by providing an almost U-shaped notch on the ring 24 for the fixation and bending it inward for a prescribed angle. The elastic piece 25 for locking is bent in the state of being projected to be inclined to a side lower part in the insertion direction of the treating tool insertion tube 22 inside the clearance 26 for the connection, and when the treating tool insertion tube 22 is inserted to the prescribed position of the clearance 26 for the connection, even when force acts in the direction of pulling it out, the elastic piece 25 for locking is gnawed into the treating tool insertion tube 22 and prevents it from being detached.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a treatment instrument insertion channel provided in an endoscope used for medical purposes or the like for inserting a treatment instrument such as forceps, and more particularly to a treatment instrument insertion tube for inserting a treatment instrument insertion tube into a distal end of an insertion portion. The present invention relates to a mechanism for connecting to a treatment instrument passage provided in the main body of the section.

[0002]

2. Description of the Related Art Generally, an endoscope has an insertion portion 2 which is inserted into a body cavity or the like in a main body operation portion 1 as shown in FIG.
And the universal cord 3 that is detachably connected to the light source device and the like is pulled out from the main body operation unit 1. The insertion portion 2 is composed of a flexible portion 2a that bends along the insertion path for most of the length from the connection portion to the main body operation portion 1, and the flexible portion 2a has an angle portion 2b and an angle portion 2b. A tip body 2c is connected to the portion 2b.

As shown in FIG. 8, the tip portion main body 2c is provided with an illumination window 4 and an observation window 5, and the illumination window 4 is provided.
The interior of the body cavity or the like can be observed through the observation window 5 under illumination from. The angle portion 2b is for orienting the tip body 2c in a desired direction. Therefore,
The angle portion 2b can be bent in a desired direction, and the bending operation is performed by the angle knob 6 provided in the main body operation portion 1. Then, in order to widen the range of the direction control of the tip portion main body 2c, as shown by a virtual line in FIG. 8, the angle portion 2b is 180 ° or more in at least one direction (upward in FIG. 8). There is also a structure that can be bent further.

The insertion section 2 is provided with a treatment instrument insertion channel 7 for inserting a forceps or other treatment instrument. The treatment instrument insertion channel 7 is a passage from the treatment introducing portion 8 provided in the main body operating portion 1 to a portion opened in the distal end portion main body 2c. The tip body 2c is made of a hard material such as metal, and the tip body 2c is formed with a through hole extending in the axial direction of the insertion section 2 as shown in FIG. It becomes the treatment instrument passage 9 for leading out the treatment instrument such as F. On the other hand, the angle portion 2b is bent by a bending operation, and the flexible portion 2a is also freely bendable.
In a, the treatment instrument insertion channel 7 is a treatment instrument insertion tube 10 made of a hollow flexible tube.

[0005] The treatment instrument insertion tube 10 is required to have flexibility first, and because the treatment instrument is inserted inside, it is necessary to smoothly insert the treatment instrument.
At least the inner surface should be slippery. Moreover, it is necessary to have high strength so as not to cause so-called kink buckling when the angle portion 2b bends. In order to meet these requirements, the treatment instrument tube 10 is generally formed of a synthetic resin, particularly a fluororesin.

The treatment instrument insertion tube 10 is attached to the distal end body 2c.
The base 11 is used to connect to the treatment instrument passage 9 in. The mouthpiece 11 is made of, for example, a metal pipe, and one side thereof is inserted into the large diameter portion 9a provided in the treatment instrument passage 9 and fixed by means such as adhesion or brazing. Then, the angle portion 2 is separated from the treatment instrument passage 9 by a predetermined length.
The distal end of the treatment instrument insertion tube 10 is fitted to this protruding portion and fixed by using an adhesive or the like.

[0007]

As described above, the treatment instrument insertion channel 7 connects the treatment instrument insertion tube 10 to the treatment instrument passage 9 by using the mouthpiece 11 as described above.
The tip portion main body 2c provided with is made of metal such as stainless steel in order to have high strength, and the base 11 is also required to have strength. Since they are formed of the same material, they can be firmly fixed using an appropriate adhesive. However, since the treatment instrument insertion tube 10 is formed of a slippery synthetic resin such as a fluororesin, even if the treatment instrument insertion tube 10 is fixed to the mouthpiece 11 made of a metal pipe with an adhesive, sufficient adhesion is provided therebetween. The force cannot be exerted, and if a force in the pulling direction acts on the treatment instrument insertion tube 10, it may deviate.

In order to stabilize the fitting state of the treatment instrument insertion tube 10 to the mouthpiece 11, it is necessary to prevent the treatment instrument insertion tube 10 from deviating by, for example, lengthening the fitting length therebetween. Since the base 11 is a hard pipe, the portion up to the end of the base 11 is a hard part. That is, the angle portion 2b has a bendable node ring structure by sequentially pivotally attaching the plurality of angle rings 12, but the tipmost angle ring 12a is connected to the tip portion main body 2c. It is fixed to the main body 2c. Therefore, the hard portion of the insertion portion 2 is from the tip body 2c to the end position of the most advanced angle ring 12a, and if the base 11 is lengthened, this most advanced angle ring 12a also needs to be elongated, The hard portion at the tip of the insertion portion 2 as a whole is elongated. If the hard portion becomes long, there are problems that it becomes difficult to pass through a sharply bent portion in the insertion path into the body cavity, and the patient suffers more pain.

The present invention has been made in view of the above points, and an object thereof is a simple structure without increasing the fitting length of the treatment instrument insertion tube to the mouthpiece.
This is to enable the treatment instrument insertion tube to be firmly fixed to the base.

[0010]

In order to achieve the above-mentioned object, the present invention fits and fixes a fixing ring to a mouthpiece, and inserts a treatment instrument insertion tube between the fixing ring and the mouthpiece. Form a ring-shaped connecting space into which the tip is inserted,
The fixing ring is characterized in that an elastic elastic piece for locking, which is inclined in a direction projecting into the connecting space toward the front in the insertion direction of the treatment instrument insertion tube, is continuously provided.

[0011]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings. Note that there is no particular difference in the overall configuration of the endoscope from that shown in FIG. 7,
The same or equivalent members are given the same reference numerals and the description thereof will be omitted.

As shown in FIG. 1, the treatment instrument insertion channel 20 is provided between the treatment instrument passage 21 provided in the distal end main body 2c of the insertion portion 2 and the treatment instrument passage 21 to the treatment instrument introduction portion 8. Concerning the point that the treatment tool insertion tube 22 is provided and the treatment tool insertion tube 22 is slippery and is formed of a flexible synthetic resin such as fluororesin,
There is no particular difference from the above-mentioned prior art. A large diameter portion 21a is formed in the treatment instrument passage 21, and a mouthpiece 23 is fitted and fixed to the large diameter portion 21a, and the tip of the treatment instrument insertion tube 22 is fitted into the mouthpiece 23. Therefore, there is no particular difference from this in the related art. The treatment instrument insertion channel 20 is not limited to the direct-view type endoscope that opens on the distal end surface of the insertion portion 2 together with the illumination window, the observation window, and the like, and also the distal end portion main body 2
Even in a side-viewing type or perspective type endoscope that is bent at 90 ° to a predetermined angle in c and opens on the side surface of the tip body,
Since the lead-out portion of the treatment instrument insertion channel from the body of the distal end portion to the angle portion side is oriented in the axial direction of the insertion portion, the treatment instrument insertion channel should be configured as a treatment instrument insertion channel in the side-view-type and perspective-type endoscopes. Of course, you can

The base 23 can be easily fixed to the treatment instrument passage 21 by using an adhesive and can be firmly fixed. However, the treatment instrument insertion tube 22 is attached to the base 2
If it is fixed to 3 using an adhesive, it cannot be firmly fixed. Therefore, instead of the adhesive, the fixing is performed as follows.

A thin fixing ring 24 made of an elastic metal material is used. As is apparent from FIGS. 2 and 3, the fixing ring 24 is provided with substantially U-shaped cuts at a plurality of locations (three locations at every 120 ° in the drawing) on the peripheral body portion. By bending the portion inward at a predetermined angle, the locking elastic piece 25 is formed. The engaging teeth 25a are provided by forming an uneven portion at the tip of the engaging elastic piece 25.

On the other hand, the mouthpiece 23 does not have a uniform thickness, so that the treatment instrument passage 21 is not covered with the treatment instrument passage 21.
A portion of a predetermined length projecting from 1 toward the side of the angle portion 2b is a thick portion 23a, and a portion continuous with the thick portion 23a has a step formed on the outer peripheral side and has a predetermined length. A thin portion 23b is formed. The step between the thick portion 23a and the thin portion 23b has a size substantially equal to the thickness of the treatment instrument insertion tube 22 or slightly smaller than the thickness of the treatment instrument insertion tube 22.

In the mouthpiece 23, a part up to the middle of the thick portion 23a is inserted into the treatment instrument passage 21 and fixed by using an adhesive. In addition, of the thick portion 23a of the base 23,
A fixing ring 24 is fitted to a portion projecting from the treatment instrument passage 21 to the angle portion 2b side and fixed by using an adhesive. Here, the fixing ring 24 is fitted with the tip of the locking elastic piece 25 provided with the locking teeth 25a formed thereon facing forward in the fitting direction of the base 23. The distal end body 2c provided with the treatment instrument passage 21, the mouthpiece 23, and the fixing ring 24 are made of a metal material, and therefore, these can be firmly fixed using an adhesive. The tip body 2c is not necessarily made of metal, but may be made of hard resin. In this case, the base 23
The fixing ring 24 is made of a material that is firmly fixed to the tip body 2c with an adhesive.
Of course, the base 23 has a predetermined strength, and the fixing ring 2
4 must have the necessary elasticity. In short, the mouthpiece 23 and the fixing ring 24 are selected, and the type of the adhesive is selected, so that the mouthpiece 23 is inserted into the treatment instrument passage 21.
It is possible to firmly fix the fixing ring 24 to the base 23 and the fixing ring 24 to the base 23 firmly.

When the mouthpiece 23 and the fixing ring 24 are attached to the treatment instrument passage 21 in the tip body 2c, the mouthpiece 23
An annular connecting space 26 is formed between the outer surface of the thin portion 23b and the inner surface of the fixing ring 24. Here, the length of the base 23 and the fixing ring 24 toward the angle portion 2b side is preferably as short as possible since these members are hard members. However, the elastic piece 25 for locking of the fixing ring 24 is the thin portion 2 of the base 23.
It must be located in the upper position of 3b. Also, the base 2
As for the relative positional relationship between 3 and the tip portion of the fixing ring 24, they may be at the same position, or the mouthpiece 23 may be in a protruding state, but when the fixing ring 24 is made to protrude. As will be described later, the insertability of the treatment tool is improved.

The treatment instrument insertion tube 22 is connected by inserting the distal end thereof into a connection space 26 formed between the base 23 and the fixing ring 24. Although the locking elastic piece 25 of the fixing ring 24 projects toward the inside of the coupling space 26, the fixing ring 24 projects in a state in which it is inclined obliquely downward toward the insertion direction of the treatment instrument insertion tube 22, and Since the elastic piece 25 for locking is made of an elastic member, as shown in FIG.
When the locking elastic piece 25 rises in the arrow direction when it is inserted into the connecting space 26 in the arrow direction, the locking elastic piece 25 does not cause a special obstacle when the treatment instrument insertion tube 22 is inserted. I won't.

The treatment instrument insertion tube 22 has a connecting gap 26.
To a predetermined position, preferably the thin portion 23b of the base 23
When it is inserted to a position where it abuts on the step between the thick portion 23a and the thick portion 23a, the treatment instrument insertion tube 22 cannot be moved in the pulling back direction, so that the treatment instrument insertion tube 22 is fixed to the mouthpiece 23. It has been connected. That is, as shown in FIG. 5, when a force in the pulling-out direction indicated by the arrow is applied to the treatment instrument insertion tube 22, the locking elastic piece 25 of the fixing ring 24 is connected by the connecting gap 26 as indicated by the arrow.
5A and 5B, the locking teeth 25a provided on the tip of the locking elastic piece 25 are attached to the outer surface of the flexible treatment instrument insertion tube 22 at the T portion in FIG. You will start to bite. And this elastic piece 2 for locking
Since the fixing ring 24 provided with 5 is firmly fixed to the mouthpiece 23 with an adhesive, even if the force of the withdrawal direction of the treatment instrument insertion tube 22 is transmitted to the fixing ring 24, the fixing ring 24 is There is no risk of deviation from 23. Therefore, the treatment instrument insertion tube 22 is firmly fixed, and there is no possibility of coming off from the treatment instrument passage 21.

The length of the hard portion at the tip of the insertion portion is composed of the tip body provided with an illumination window, an observation window, etc., and the most advanced angle ring connected to this tip body. The mouthpiece 23 that connects the treatment instrument insertion tube 22 to the distal end body does not need to secure an adhesive area with respect to the treatment instrument insertion tube 22, and is used for fixing the fixing ring 24 and for locking the fixing ring 24. It may have a length required to form the elastic piece 25. Therefore, as a result of being able to shorten the axial direction of the mouthpiece 23 and the elastic piece 25 for locking, the length of the most advanced angle ring can be shortened, and the length of the hard portion at the tip of the insertion portion is shortened, so that it can be inserted into the body cavity. The insertion operability is improved and the patient's pain can be reduced.

Since the treatment instrument insertion channel 20 is open in the body cavity and is also used as a suction passage, the joint between the treatment instrument insertion tube 22 and the mouthpiece 23 is kept airtight. Must. Therefore, when the treatment instrument insertion tube 22 is inserted into the coupling space 26, the treatment instrument insertion tube 22 or the mouthpiece 23 is previously coated with a sealing material or a sealing material having an adhesive function. In particular, when the sealing material having an adhesive function is applied to the inner and outer peripheral surfaces of the treatment instrument insertion tube 22 and the distal end face and is inserted into the coupling gap 26, the treatment instrument insertion tube 22 is
Both the base 23 and the fixing ring 24 are adhered, and the function of the elastic piece 25 for locking and the base 2
The fixing strength to 3 is remarkably improved. Further, in FIG.
As shown in FIG. 5, the sealing material is a step portion of the treatment instrument insertion tube 22, the stepped portion of the mouthpiece 23, and the fixing ring 24.
Since it can be contained between the inner surface and the inner surface, the sealing function is significantly improved.

Further, since the contact length of the treatment instrument insertion tube 22 with the fixing ring 24 is longer than the contact length with the mouthpiece 23, when the angle portion 2b is curved, When the treatment instrument insertion tube 22 bends, it does not bend from the portion of the mouthpiece 23 that is the inner surface side, but from the end of the fixing ring 24 that is fitted to the outer surface. Therefore, the treatment instrument insertion tube 22
The edge portion of the tip of the mouthpiece 23 projects on the inner surface of the mouthpiece, and when the treatment instrument is inserted, there is no risk of being caught by this edge portion, and the treatment instrument can be inserted very smoothly even when the treatment instrument insertion tube 22 is bent. be able to.

Although the locking elastic pieces provided on the fixing ring are substantially U-shaped, and the elastic pieces for locking are provided at three positions, as shown in FIG. 6, for example. Needless to say, a fixing ring 31 or the like having a plurality of V-shaped elastic pieces 30 for locking can be used, and the number thereof is not limited to three. Further, for example, when the fixing ring is formed of a member having no elasticity, an opening is provided in the peripheral body portion, and a locking elastic piece made of an elastic member is fixedly provided near the opening. You can also

[0024]

EFFECTS OF THE INVENTION Since the present invention is constructed as described above, the treatment instrument insertion tube can be inserted by a very simple operation of inserting the treatment instrument insertion tube into the connecting space between the mouthpiece and the fixing ring. Can be securely fixed in a state of being communicated with the treatment instrument passage, and the length of the hard part on the distal side of the mouthpiece can be shortened, so that the hard part at the distal end of the insertion part can be shortened as a whole, and the body cavity can be shortened. The operability of insertion into a patient's body is improved and the patient's pain is reduced.

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing an embodiment of the present invention and showing a configuration of a connecting portion of a treatment instrument insertion tube of a treatment instrument insertion channel of an endoscope to a mouthpiece attached to a treatment instrument passage. is there.

FIG. 2 is a vertical sectional view of a fixing ring.

FIG. 3 is a right side view of FIG. 2;

FIG. 4 is an operation explanatory view showing a state in which the treatment tool insertion tube is inserted between the mouthpiece and the fixing ring.

FIG. 5 is an operation explanatory view when a force in a pulling direction is applied to the treatment instrument insertion tube.

FIG. 6 is a front view showing a modified example of the fixing ring.

FIG. 7 is an external view showing a general configuration of an endoscope.

FIG. 8 is an external view showing a distal end portion of an insertion portion.

FIG. 9 is a cross-sectional view showing a configuration of a connection portion of a treatment instrument insertion tube of a conventional treatment instrument insertion channel to a mouthpiece attached to a treatment instrument passage.

[Explanation of symbols]

 2 insertion part 2a tip part main body 20 treatment instrument insertion channel 21 treatment instrument passage 22 treatment instrument insertion tube 23 base 23a thick portion 23b thin portion 24, 31 fixing ring 25, 30 locking elastic piece 25a locking tooth 26 connection Space for

Claims (3)

[Claims] 1. A treatment instrument, wherein an insertion portion having a distal end body made of a hard member is continuously provided to a main body operation portion, a treatment instrument passage is formed in the distal end body, and a treatment instrument is provided in the treatment instrument passage through a mouthpiece. In a configuration in which an insertion tube is connected, a fixing ring is fitted and fixed to the mouthpiece, and a tip portion of the treatment instrument insertion tube is inserted between the fixing ring and the mouthpiece. An annular connecting void is formed, and a locking elastic piece that is inclined in a direction projecting into the connecting void toward the front in the insertion direction of the treatment instrument insertion tube is continuously provided on the fixing ring. A channel for inserting a treatment tool for an endoscope. 2. The elastic piece for locking is characterized in that one or a plurality of cuts are provided in a portion of the fixing ring facing the base, and the cuts are bent inward. The treatment tool insertion channel for an endoscope according to claim 1. 3. The treatment instrument insertion channel of an endoscope according to claim 1, wherein the fixing ring is configured to have a length that covers the treatment instrument insertion tube longer than the base.