JP3238650B2 - Basket-type gripper for endoscope - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a basket type gripper for an endoscope which is used for capturing and discharging foreign matter from a body cavity endoscopically.

[0002]

2. Description of the Related Art In general, basket-type grippers for endoscopes are
A basket portion formed in a cage shape with at least three elastic wires bound at both front and rear ends is arranged so as to be freely taken in and out from the distal end of the sheath, and the basket portion is narrowed by being drawn into the distal end of the sheath, and the sheath is retracted. When it protrudes from the tip, it expands in a cage shape due to its own elasticity.

[0003]

When a foreign body or the like in a body cavity is trapped endoscopically using the basket-type gripper for an endoscope as described above, the foreign body on the mucous membrane surface is removed. An operation of moving the basket portion back and forth in the axial direction of the sheath is performed.

However, in the case where the elastic wires forming the basket portion are arranged in parallel with the axial direction of the sheath, if the foreign matter is slightly small, the foreign material once entering the inside of the basket portion may be used as the elastic wire of the adjacent elastic wire. There are many cases where a person slips through the space and goes out of the basket part and cannot easily catch the object.

Further, as in a so-called dolmia-type endoscope basket-type gripper (Japanese Patent Publication No. 62-42617), each elastic wire forming the basket is twisted in the same direction around the central axis of the sheath. In what is arranged,
When the basket portion is moved forward and backward in the axial direction, the elastic wire pushes away the foreign matter, so that it is difficult for the foreign matter to enter the basket.

Accordingly, an object of the present invention is to provide a basket-type gripper for an endoscope which can easily catch foreign matters and the like in a basket portion.

[0007]

In order to achieve the above object, a basket type gripper for an endoscope according to the present invention has a basket-shaped swelling shape formed by at least three elastic wires bound at both front and rear ends. The formed basket portion is arranged so as to be able to be taken in and out from the distal end of the sheath, and the basket portion is
Contracted by being drawn into the distal end of the sheath,
In an endoscope basket-type gripper which is configured to swell into the basket by its own elasticity in a state where the sheath protrudes from the distal end of the sheath, each of the elastic wires is rotated around the center axis of the basket portion at the same corresponding position. And a guide path through which the elastic wires pass is formed in the inner surface of the distal end of the sheath.

The cross-sectional shape of the distal end portion of the sheath may be formed in a polygonal shape, and each corner thereof may serve as the guide path. May be formed, and each of the grooves may serve as the guide path.

In addition, each of the elastic wires is arranged without being twisted with respect to the center axis of the basket portion in at least one portion on the front side or the rear side of the middle portion of the basket portion where the bulge is large. The basket part may be arranged so as to be twisted in the same direction around the central axis of the basket part in the whole range or a part of the range.

In this case, each of the elastic wires may be arranged so as to be twisted in the same direction around the central axis of the basket portion in a portion behind the middle portion of the basket portion where the bulge is large.

Alternatively, each of the elastic wires may be arranged so as to be twisted in the same direction around the central axis of the basket portion in the middle portion of the basket portion where the bulge is large.

The basket portion may be formed by bending each of the elastic wires at a plurality of locations, and the basket portion may be formed by bending each of the elastic wires smoothly in a curved manner. .

[0013]

Embodiments of the present invention will be described with reference to the drawings. FIG. 2 shows a distal end portion of a basket-type gripper for an endoscope according to the first embodiment of the present invention. For example, four elastic wires 1 made of a stranded wire or a single wire of a stainless steel wire are respectively used. The basket portion 10 is bent into a shape, fixed and bound to each other at both front and rear ends, and formed into a basket-like shape as a whole.

The tips of the four elastic wires 1 are inserted into a short tubular tip binding pipe 20 and fixed thereto by silver brazing or the like, and the tip surface of the tip binding pipe 20 has a smooth hemisphere. It is rounded.

The base ends of the four elastic wires 1 are inserted into a rear end bundling pipe 50 and fixed thereto by silver brazing or the like. An operation wire 40 made of, for example, a stranded wire of a stainless steel wire is inserted into the rear end binding pipe 50 from the opposite side and fixed by silver brazing or the like. As a result, the four elastic wires 1 and the operation wire 40 are connected via the rear end binding pipe 50.

The operation wire 40 is inserted in the sheath 30 made of, for example, a tetrafluoroethylene resin tube so as to be able to advance and retreat in the axial direction, and advances and retreats at an operation portion (not shown) connected to the proximal end of the sheath 30. Operated.

The rear end bundling pipe 50 also has an outer diameter that can advance and retreat within the sheath 30. By operating the operation wire 40 in the axial direction, the basket portion 10 composed of the four elastic wires 1 is moved to the distal end of the sheath 30. In and out,
The basket portion 10 contracts by being drawn into the distal end of the sheath 30, and expands to its original cage shape by its own elasticity when it protrudes from the distal end of the sheath 30.

Each elastic wire 1 has four bent portions 1
It is bent at 1, 12, 13, and 14, of which the rearmost bent portion 14 is located at the most outwardly spread position.

As shown in FIG. 3 showing a cross section taken along the line III-III, the four elastic wires 1 constituting the basket portion 10 are each bent from the distal end portion fixed in the distal end binding pipe 20. In the range from the portions 11, 12, and 13 to the rearmost bent portion 14, there is no twist with respect to the central axis of the basket portion 10 (that is, an extension of the central axis of the distal end portion of the sheath 30). Basket part 10
Are arranged radially from the center of

However, during the period from the rearmost bent portion 14 to the portion fixed by the rear end binding pipe 50 at the rear end (hatched portion A), each elastic wire 1 is in the same direction around the central axis of the basket portion 10. For example, it is arranged in a state of being twisted by 45 °.

For the sake of simplicity, the hatched portion A is shown only for one elastic wire 1, but the four elastic wires 1 are provided at the same position in the same rotation direction and in the same amount in the basket portion. 10 are twisted around the central axis.

The distal end portion of the sheath 30 is tapered, and the cross section perpendicular to the axis of the mouth portion 30a is formed in a substantially square shape as shown in FIG. As a result, the four elastic wires 1 pass along the four corners 31 on the inner surface of the distal end portion 30a, and each corner 31 is an elastic wire guide path through which the elastic wire 1 passes.

Therefore, when the twisted portion A of the elastic wire 1 is drawn into the sheath 30 along the elastic wire guide path 31 as shown in FIG. 4, as shown in FIG.
The elastic wire 1 rotates in the R direction around the central axis of the basket portion 10.

Therefore, the basket part 10 is made of the sheath 3
When the operation wire 40 is pulled toward the hand side from the state shown in FIG. 2 which protrudes from the tip of the sheath 0 and swells in a cage shape, as shown in FIG.
Until the tip of the elastic wire 1 is reached, the twisted portion A of the elastic wire 1
Passes through the elastic wire guide path 31 of the sheath 30, whereby the basket portion 10 is drawn into the sheath 30 while rotating around the central axis.

After the rearmost bent portion 14 has passed through the elastic wire guide path 31, the untwisted portion of the elastic wire 1 passes through the elastic wire guide path 31, so that the basket section 10 rotates. Sheath 30 without accompanying
Drawn into.

FIGS. 7 to 9 show the use state of the basket type gripper for an endoscope according to this embodiment. First, as shown in FIG. 7, a treatment tool insertion of an endoscope (not shown) is performed. With the distal end of the sheath 30 passed through the channel facing the foreign body 100 in the body cavity, the operation wire 40 is pushed forward,
The basket part 10 is pressed against the foreign matter 100.

Then, since the respective elastic wires 1 of the basket portion 10 are not twisted on the front side of the rearmost bent portion 14, as shown in FIG. 8, the foreign matter 100 passes through the gap between the adjacent elastic wires 1 as shown in FIG. It easily enters the basket section 10.

Therefore, this time, the basket unit 10 is preferably used.
When the sheath 30 is pushed out without moving the
As shown in (1), the basket portion 10 contracts while rotating around the axis, and the foreign matter 100 is in a state of being clamped by the four elastic wires 1.

If the basket portion 10 does not rotate during the operation, the foreign matter 100 tends to slip out of the gap between the adjacent elastic wires 1, but the rotation occurs when the basket portion 10 narrows. The elastic wire 1
Is well caught by the foreign material 100, so that the foreign material 100 can be reliably held in the basket portion 10.

The rotation angle of the basket portion 10 (that is, the twist angle of the elastic wire 1 around the central axis of the basket portion 10) is 45 ° in this embodiment, but is 15 ° according to the purpose of use. The angle may be set to an appropriate angle within a range of about 90 ° to about 90 °.

In the above embodiment, the elastic wire guide path 31 is formed by forming the distal end portion 30a of the sheath 30 into a polygonal shape corresponding to the number of the elastic wires 1 as shown in FIG. As in the second embodiment, the distal end portion 30a of the sheath 30 is formed in a star shape or the like having a number of protrusions corresponding to the number of the elastic wires 1, and a groove formed by the inner surface of the protrusion. May be used as the elastic wire guide path 31.

Further, as in the third embodiment shown in FIG. 11, a number of grooves corresponding to the number of elastic wires 1 are formed at equal intervals in the distal end portion 30a of the sheath 30, and the grooves are formed. The elastic wire guide path 31 may be used.

FIG. 12 shows a basket type gripper for an endoscope according to a fourth embodiment of the present invention, in which a basket portion 10 is formed by bending four elastic wires 1 into a smooth curve. Things.

Also in this embodiment, the elastic wire 1 is not twisted at the most swelled portion of the basket portion 10 and at the portion on the front side thereof, and the basket 1 is slightly backward from the most swelled portion of the basket portion 10. In the area of the rear end of the section 10, each elastic wire 1 is
It is formed so as to be twisted by the same amount in the same direction about the 0 axis. As a result, the same functions and effects as those of the first embodiment can be obtained.

FIG. 13 shows a basket type gripper for an endoscope according to a fifth embodiment of the present invention, in which four elastic wires 1 are provided at four bent portions 11, 12, 13, and 14. It is the same as the first embodiment in that it is bent to form the basket portion 10.

However, in this embodiment, XIV-X
As shown in FIG. 14 showing the IV cross section, each elastic wire 1 is provided only between the third bent portion 13 and the fourth bent portion 14 (A portion) of the intermediate portion of the basket portion 10.
Are twisted by the same amount in the same direction around the axis of the basket portion 10, and in other portions, each elastic wire 1 is not twisted with respect to the axis of the basket portion 10.

In the case of the basket-type gripper for an endoscope according to the embodiment configured as described above, as shown in FIG. Is drawn toward the user, the foreign matter 100 can be put into the basket portion 10 as shown in FIG. 16 without rotating the basket portion 10.

When the basket portion 10 is further pulled into the sheath 30 from this state, the twisted portion A of the elastic wire 1 passes through the elastic wire guide path 31 formed in the distal end portion 30a of the sheath 30. 10 rotates around the central axis while each elastic wire 1
00, the foreign matter 100 can be securely held in the basket portion 10 as shown in FIG.

As described above, by arranging each elastic wire 1 without twisting with respect to the center axis of the basket portion 10 at least on one side of the middle portion where the bulge of the basket portion 10 is large or at the rear side. Foreign object 10
0 can be easily taken into the basket part 10,
The elastic wire 1 is twisted and arranged in the same direction around the central axis of the basket portion 10 in the entire range or a partial range of the other portion, and the elastic wire guide path 31 is formed in the distal end portion 30a of the sheath 30. By doing so, the foreign matter 100
When tightening, the basket portion 10 rotates and the foreign matter 100 can be reliably held so as not to come out of the basket portion 10.

The manner of rotation of the basket unit 10 is as follows.
It can be set arbitrarily depending on how the twisted portion A of the elastic wire 1 is formed. For example, as shown in FIG.
If the torsion portion A is formed in the middle portion of the elastic wire 1 by being twisted in one direction, the basket portion 10 rotates in one direction only while the torsion portion A passes through the elastic wire guide path 31, and FIG. As shown in the figure, if the twisted portion A is formed by changing the direction in the middle from the right to the left in a curved manner and twisting, the basket portion 10 smoothly rotates from the left rotation to the right rotation. do.

In each of the above-described embodiments, the basket portion 10 is formed by four elastic wires 1. However, the present invention is not limited to this. Any number of books may be used.

[0042]

According to the present invention, the basket portion which can be freely inserted and removed from the distal end of the sheath is formed of a plurality of elastic wires, and each of the elastic wires is formed around the center axis of the basket portion at the same corresponding portion. By disposing them in the same direction and forming guide paths through which the elastic wires pass through the inner surface of the distal end of the sheath, the basket rotates when the elastic wires are used to tighten the foreign objects. Can be securely held so as not to fall out of the basket portion.

[Brief description of the drawings]

FIG. 1 is a perspective view of a distal end portion of a sheath according to a first embodiment of the present invention.

FIG. 2 is a side sectional view of a distal end portion of the first embodiment of the present invention in a state where a basket portion is expanded.

FIG. 3 is a diagram illustrating a first embodiment according to the present invention;
It is a III sectional view.

FIG. 4 is a partial perspective view for explaining the operation of the elastic wire according to the first embodiment of the present invention.

FIG. 5 is a partial perspective view for explaining the operation of the elastic wire according to the first embodiment of the present invention.

FIG. 6 is a side cross-sectional view of a distal end portion of the first embodiment of the present invention in a state where the basket part is narrowed partway.

FIG. 7 is a side view of the use state of the first embodiment of the present invention.

FIG. 8 is a side view of the use state of the first embodiment of the present invention.

FIG. 9 is a side view of the use state of the first embodiment of the present invention.

FIG. 10 is a perspective view of a distal end portion of a sheath according to the second embodiment of the present invention.

FIG. 11 is a perspective view of a distal end portion of a sheath according to a third embodiment of the present invention.

FIG. 12 is a side view of a tip portion of a fourth embodiment of the present invention in a state where a basket portion is expanded.

FIG. 13 is a side sectional view of a tip portion of a fifth embodiment of the present invention in a state where a basket portion is expanded.

FIG. 14 is a sectional view taken along the line XIV-XIV in FIG. 13 of a fifth embodiment of the present invention.

FIG. 15 is a side view of the use state of the fifth embodiment of the present invention.

FIG. 16 is a side view of the use state of the fifth embodiment of the present invention.

FIG. 17 is a side view of the use state of the fifth embodiment of the present invention.

FIG. 18 is a perspective view for explaining a mode of rotation of a basket portion of the basket for the endoscope of the present invention.

FIG. 19 is a perspective view for explaining a mode of rotation of a basket portion of the basket for the endoscope of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Elastic wire 10 Basket part 30 Sheath 30a Tip mouth part 31 Elastic wire guideway (corner part, groove part) 40 Operation wire A Twist part

Continuation of the front page (56) References JP-A-60-96241 (JP, A) JP-A-56-166012 (JP, U) Tokuhyo Hei 8-506981 (JP, A) (58) Fields investigated (Int) .Cl. ⁷ , DB name) A61B 17/00-18/28

Claims (7)

(57) [Claims] 1. A basket portion formed in a cage-like shape by at least three elastic wires bound at both front and rear ends is arranged so as to be able to be taken in and out of a distal end of a sheath,
The basket portion for an endoscope, wherein the basket portion is narrowed by being pulled into the distal end of the sheath, and in a state protruding from the distal end of the sheath, expands in a cage shape by its own elasticity. Each of the elastic wires is disposed without being twisted with respect to the central axis of the basket portion at the same portion corresponding to at least one portion on the front side or the rear side of the middle portion of the basket portion where the bulge is large. In the whole area or a part of the area, the basket is twisted around the center axis of the basket in the same direction, and the elastic wires are elastically attached to the inner peripheral surface at the distal end of the sheath. A guide surface to be pressed and guided is formed, and the torsion portion of the elastic wire is
When the basket passes through the surface,
Endoscopic basket type grasping tool characterized that you rotate in Ri. 2. A cross-sectional shape of a tip end portion of the sheath is formed in a polygonal shape, and an inner surface of each corner portion is formed by the guide.
The basket-type gripper for an endoscope according to claim 1, wherein the gripper has a surface . 3. have a plurality of grooves on the inner peripheral surface of the tip mouth portion of the sheath is formed, the inner surface of its respective groove is the guide
The basket-type gripper for an endoscope according to claim 1, wherein the gripper has a surface . 4. The basket according to claim 1, wherein each of said elastic wires is twisted in the same direction around the central axis of said basket portion at a portion behind said middle portion of said basket portion having a large bulge. Or a basket-type gripper for an endoscope according to 3 above. 5. The basket according to claim 1, wherein the elastic wires are twisted in the same direction around the central axis of the basket portion in the middle portion of the basket portion where the bulge is large. Basket type gripper for endoscope. 6. The basket portion is formed by bending each of the elastic wires at a plurality of positions.
13. The basket-type gripper for an endoscope according to any one of the above items. 7. The basket type gripper for an endoscope according to claim 1, wherein said basket portion is formed by bending each of said elastic wires smoothly in a curved manner.