JPS6115853Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to an endoscope insertion tool that is inserted into an endoscope insertion channel and used for removing polyps, stones, etc.

A so-called penetrating tool is inserted into the channel of an endoscope inserted into a body cavity and used to observe the inside of the body cavity using the endoscope to remove and collect polyps or stones inside the body cavity. A basket-type foreign body retrieval device and a snare-type resection device are used.

Each of these consists of a flexible sheath that can be inserted into an insertion channel of an endoscope, and an operating member that is inserted into the flexible sheath. As a flexible sheath, a long flexible tube is used as the material itself, such as a tube formed in the form of a tight coil or a plastic tube, but the operating member as an insertion tool that is inserted through this tube is There is a slight difference in structure between the basket type foreign body retrieval tool and the snare type foreign body removal tool. FIG. 1 shows an example of a basket-type foreign object collection tool. In this foreign matter recovery tool, as shown in the figure, the operating member as an insertion tool that is inserted into the flexible sheath 1 has a long operating wire 5.
and a plurality of elastic wires 2 provided at the tip thereof.
a, 2b, 2c, and 2d. These plurality of elastic wires 2a, 2b, 2c, and 2d are bound together at their front ends by a tip metal fitting 3, and their rear ends are bound and fixed to the tip of the operating wire 5 by a connecting metal fitting 4. There is. When each elastic wire protrudes from the flexible sheath 1 within the body cavity, each elastic wire bends due to its own inherent elasticity,
It is shaped like a basket and expands. On the other hand, the snare-type cutting tool, as shown in Figure 2,
The shape and quantity of the elastic wires that form part of the operating member are different from those of the basket-type foreign object collection tool;
The elastic wires 2a' and 2b' are arranged so as to spread out in a trap-like manner, and the other configuration is substantially the same as that of the basket-type foreign matter collecting tool.

In the basket-type foreign body collection device, foreign bodies such as polyps or stones are removed from the body cavity using the elastic wire 2.
The elastic wires 2a, 2b, 2c, 2 are surrounded by a basket-shaped portion formed by the wires 2a, 2b, 2c, and 2d, and then the operating wire 5 is pulled to expand the elastic wires 2a, 2b, 2c, and 2 into a basket shape.
d into the flexible sheath 1, the elastic wires 2a, 2b, 2c, and 2d tighten and grasp the foreign object, and the foreign object is collected when the endoscope is pulled out. In addition, in a snare-type resection tool, a polyp or the like in a body cavity is sandwiched between the elastic wires 2a' and 2b', and in this state, the operating wire 5 is pulled or the flexible sheath 1 is pushed in and the elastic wires 2a' and 2b' are By introducing the polyp 2b' into the flexible sheath 1, the elastic wires 2a', 2b' tighten the polyp and cut it out.

In the case of conventional insertion tools such as foreign body collection tools and excision tools having the above-mentioned configuration, the elastic wire 2
In the expanded state where a, 2b, 2c, 2d or 2a', 2b' expands into a basket shape or a trap shape, each elastic wire is operated by the convergence point on the rear end side of the expanded shape. It was made to occupy approximately the same position as the point where it is tied to the wire 5. Therefore, when applied to a side-viewing endoscope, as shown in FIG.
When the flexible sheath 1 housing the insertion tool is raised by the insertion tool raising stand 7 provided therein, the flexible sheath 1 containing the connecting fitting 4 is raised.
A difficult-to-bend part may be located between the bending starting point by the raising table 7 and the open end of the insertion channel that passes through the flexible sheath 1, and if the radius of curvature of that part is small, the bending part may be difficult to bend. Not only is it difficult to push and pull the flexible sheath 1, but it is difficult to push and pull the operating wire 5.
When performing the necessary operations such as protruding and retracting a' and 2b' from the flexible sheath 1, the friction between the connecting fitting 4 and the bending inner wall of the flexible sheath 1 increases. There was a flaw that made it impossible to perform certain operations.

Further, when these insertion tools are applied to a direct-viewing endoscope, they have the same operational defects. That is, if the curved part (the part indicated by the reference numeral 9 in FIG. 6) formed continuously with the tip metal fitting 6 at the tip of the insertion portion of the endoscope is bent with a small radius of curvature, the connecting metal fitting 4 However, it came into sliding contact with the curved inner wall of the flexible sheath, which was bent in accordance with the curvature of the curved portion, with a large amount of friction, significantly impeding operability.

The present invention was developed to solve the above-mentioned problem, and even when the insertion tool is bent at a small radius of curvature at the distal end of the endoscope or the curved part of the endoscope, it is possible to remove polyps. Another object of the present invention is to provide an endoscope insertion tool that can smoothly and easily collect foreign objects.

For this reason, in the insertion tool of the present invention, when each elastic wire protrudes from the flexible sheath, the convergence point of the expanded shape of each elastic wire that spreads from the tip metal fitting, and the rear end of each elastic wire are connected to the operating wire. It is characterized in that a linear portion of sufficient length is provided between the binding point and the connecting point between the curved portion forming the expanded shape and the linear portion is processed into a gently curved shape.

Hereinafter, according to the preferred embodiment shown in the attached drawings,
The present invention will be explained in detail.

FIG. 4 is a longitudinal sectional side view showing one embodiment of the inventive insertion tool used in the basket-type foreign object recovery tool. Reference numeral 1 denotes a flexible sheath made of a flexible tube or plastic tube formed in the form of a tight coil, and is inserted into the insertion channel of the endoscope. 2a, 2b, 2c, 2
d is a plurality of elastic wires that can be inserted into the flexible sheath 1; 3 is a plurality of elastic wires 2a, 2b, 2
This is a tip metal fitting that binds the tip ends of c and 2d.
Reference numeral 5 indicates an operating wire inserted through the flexible sheath 1 to operate these wires 2a, 2b, 2c, and 2d. Reference numeral 4 indicates an operating wire that is connected to the operating wire 5 by binding the rear ends of each of these wires 2a, 2b, 2c, and 2d. This is a connecting metal fitting.

The elastic wires 2a, 2b, 2c, and 2d are each shaped in advance so that the end side thereof has a curved shape from its original shape, so that the end fitting 3
They are each arranged in a radial direction with respect to the central axis so that a basket-shaped portion 10 having a bulge on the side closer to the center is formed. Reference numeral 11 denotes a linear portion, which is similar to the cage portion 1.
The inflection point between 0 and this linear portion 11 is processed to form a gentle curve. In this way, the basket-shaped part 1
Elastic wires 2a, 2b, 2c,
2d is pressed against its own elasticity within the flexible sheath 1 and is housed in a generally straight state as a whole. Therefore, the bundled elastic wires 2a, 2
When the elastic wires 2a, 2c, 2d protrude from the open end of the flexible sheath 1, the elastic wires 2a, 2b, 2c,
Due to the inherent restoring elasticity of the elastic wires 2d, each of the elastic wires 2a, 2b, 2c, and 2d is bent back to separate from each other and expanded into a basket shape, thereby automatically forming the basket-shaped portion 10.

The length of each linear portion 11 of the elastic wires 2a, 2b, 2c, and 2d is slightly different depending on whether it is used in a side-viewing endoscope or a direct-viewing endoscope. When used in a visual endoscope, as shown in FIG.
When the operating wire 5 is let out until the elastic wire portion forming the part completely protrudes from the flexible sheath 1, the connecting fitting 4 is not located at the bending part of the flexible sheath 1 due to the raising of the raising table 7. The length shall be given. Furthermore, when used in a direct viewing endoscope, the flexible sheath 1 is attached to the distal end fitting 6 as shown in FIG.
When the operation wire 5 is let out until it protrudes to some extent from the flexible sheath 1 and the part of the elastic wire forming the cage-shaped part 10 completely protrudes from the flexible sheath 1,
A length is given in advance so that the connecting fitting 4 is not located within the curved part 9 that is connected to the distal end fitting 6 of the endoscope.

Specifically, in FIGS. 4 and 5, the basket-shaped portion 10
On the other hand, the linear portion 11 has a ratio of about 1:1.4, and in FIG. 6, the curved portion of the tip of the endoscope is long, so the ratio is about 1:4. In consideration of operability, the length of the linear portion 11 is preferably approximately twice or more than the length of the basket portion 10. In the prior art, the portion corresponding to the linear portion in the present invention is substantially zero or less than 10% of the cage portion.

According to the foreign object recovery tool as an insertion tool having the above configuration, even when used for a side-viewing endoscope, the hard and rigid connecting fitting 4 reaches the opening end of the insertion channel and the vicinity of the elevator 7. The raising operation of the raising table 7, the insertion of the flexible sheath 1, and the operation of the operating wire can be performed smoothly without any problems. Since the connecting fitting 4 does not occupy the curved portion 9, even if the curved portion 9 is bent with a small radius of curvature, the flexible sheath 1 or the operation wire 5 can be smoothly operated. It has the advantage of facilitating diagnosis and biopsies performed using the .

In the insertion tool of the present invention, not only is the linear portion 11 of sufficient length provided on the rear end side of each elastic wire as described above, but also the linear portion 11 has a convergence of a curved portion that expands into a basket shape. Since the part connected to the point is processed to form a gentle curved line, the curved part of each elastic wire within the flexible sheath 1 is made smaller than when the rear side of the curved part is bent and connected to a straight part. When pressed in a substantially straight line, the connecting portion between the curved part and the straight part 11 does not become a bent inflection point. When the connecting portion bends, the pressure reaction force exerted on the curved portion using this as a fulcrum causes the linear portion 11 to bend upward and come into pressure contact with the inner wall of the flexible sheath 1, exerting a large frictional pressure, and the above-mentioned inflection acting as a fulcrum. This, combined with the pressure of the points biting into the inner wall of the flexible sheath 1, causes problems such as operational loads for retracting and withdrawing the insertion tool within the flexible sheath 1. This invention can prevent this.

In addition, in the case where there is a bent inflection point between the straight part 11 and the cage part 10, the inflection point is
0 into the flexible sheath 1 and stored therein, it tends to get caught on the open end of the flexible sheath 1, impairing the smoothness of the operation. However, in the case of the present invention, the In this part, the widened basket-shaped part 10 and the linear part 11 are connected in a gentle curve shape, and since there is no such inflection point, the basket-shaped part 10 can be smoothly contracted and flexible. It can be drawn into the sheath 1. In addition, in the above embodiment, the details of the insertion tool used as a basket-type foreign body recovery tool were described, but according to the present invention, the same effect can be achieved when applied to other insertion tools such as a snare-type resection tool. Of course.

[Brief explanation of the drawing]

Fig. 1 is a vertical side view showing a conventional basket-type foreign body retrieval tool, Fig. 2 is a longitudinal side view showing a conventional snare-type resection tool, and Fig. 3 is a side view of a side-viewing endoscope. FIG. 4 is a longitudinal side view showing the conventional insertion tool bent by the upper stand, FIG. 4 is a longitudinal side view showing the foreign object collection tool according to the present invention, and FIG. FIG. 6 is a vertical side view showing a state in which the foreign object collection device according to the present invention is inserted into a direct-viewing endoscope and is bent along with the curved portion of the endoscope. FIG. 1...Flexible sheath, 2a, 2b, 2c, 2
d, 2a', 2b'...elastic wire, 3...tip metal fitting, 4...connecting metal fitting, 5...operating wire, 10...
...basket-shaped part, 11...straight part.

Claims (1)

[Claim for Utility Model Registration] A flexible sheath that can be inserted into the insertion channel of an endoscope, the distal ends of a plurality of elastic wires tied together with a tip fitting, and then the terminals tied to the tip of an operating wire with a connecting fitting. and an operating member having an expandable curved part formed between these binding parts, the endoscope insertion tool forming a part of the operating member inserted and housed in the flexible sheath. For each of the plurality of elastic wires, a straight part is provided behind the converging end of the expandable curved part, and a portion where the expandable curved part connects to the straight part is formed into a gently curved shape. The linear portion is such that, when the expandable curved portion is expanded, even if the tip of the endoscope or the tip of the insertion tool is bent, the connecting member will not reach the curved portion due to this operation. An endoscope insertion tool characterized by its long length.