JPH0919438A - Basket type gripper for endoscope - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a basket type gripper for an endoscope by surely bulging a basket formed of several wires into a cage-like shape so as to be able to catch foreign matter. SOLUTION: Several basket wires 21 are fixed at one end to a sheath 11 in the vicinity of the front end of the latter, and at the other end to a control wire 12 in the vicinity of the front end of the latter, and are adapted to be bulged into a cage-like shape as a whole when the control wire 12 is pulled by manipulating means 13, 15 so that the front end of the control wire 12 is made to approach the front end of the sheath 11.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an endoscopic basket-type grasping tool for capturing and collecting foreign matter and the like in a body cavity through an endoscope.

[0002]

2. Description of the Related Art In general, a basket-type grasping tool for an endoscope is formed by forming a plurality of flexible wires attached to the tip of an operating wire into a basket to form a basket, and the basket is inserted from the inside of the tip of the sheath. The basket is inflated by the elastic force of the wire itself by being pushed out, and then the foreign matter is captured therein.

[0003]

However, in the structure in which the basket bulges like a cage due to the elastic force of each wire forming the basket itself, the basket has a cage-like inflated secretion or the like, or a thin hollow organ. In the above, the wires are stuck or crushed to each other and do not expand like a cage by their own elastic force, and as a result, the foreign matter may not be captured.
In addition, when the basket is pressed against the foreign matter, the wire may be soaked and contracted that the foreign matter cannot be captured.

Therefore, an object of the present invention is to provide a basket-type grasping tool for an endoscope, which can surely inflate a basket formed of a plurality of wires into a basket shape to capture foreign matter.

[0005]

In order to achieve the above-mentioned object, the basket type grasping tool for an endoscope of the present invention is an operation wire which is inserted into a sheath so as to be able to move forward and backward so that its tip projects from the tip of the sheath. An operating means for advancing and retracting the operating wire from the proximal end side of the sheath; one end fixed near the distal end of the sheath and the other end fixed near the distal end of the operation wire; A plurality of basket wires that swell like a cage as a whole when the operation wire is pulled and the tip of the operation wire is brought close to the tip of the sheath are provided.

[0006]

Embodiments will be described with reference to the drawings. FIG. 1 shows the overall configuration of an basket-type grasping tool 10 for an endoscope according to an embodiment of the present invention. An operating wire 12 is axially movable in a slender flexible sheath 11 over its entire length. It has been inserted.

For the sheath 11, for example, a fluororesin tube is used, but a tightly wound coil pipe may be used. If flexibility is not required, a metal pipe such as stainless steel may be used.

As the operation wire 12, for example, a stranded wire in which a large number of stainless steel ultrafine wires are twisted together is used. The operation wire 12 is shown as a single thick line in order to make it easy to distinguish it from other wires.

The proximal end of the sheath 11 is connected and fixed to the end of the operation section main body 13, and the other end of the operation section main body 13 is
A finger hook 14 for engaging the first finger of the operator is formed.

The proximal end of the operating wire 12 has an operating portion main body 13
The slider 15 is slidably attached to and fixed to the slider 15. Reference numeral 16 is a metal pipe covered with the operation wire 12 to prevent the proximal end portion of the operation wire 12 from buckling.

The slider 15 has a second finger and a third finger of the operator.
Finger hooks 17 and 18 for engaging fingers are formed, and by operating the slider 15 forward and backward, the operation wire 12 advances and retracts in the sheath 11 in the axial direction.

The tip of the operation wire 12 projects forward from the tip of the sheath 11. FIG. 2 shows an enlarged view of that portion, and a plurality of basket wires 21 are attached between the tip of the sheath 11 and the tip of the operation wire 12.

In this embodiment, the basket wire 2
A stranded wire in which a large number of stainless steel ultrafine wires are twisted together is used as 1, and as shown in FIG. 3 showing a III-III cross section, three stranded wires are arranged on one side surface of the operation wire 12. Then, one end of each basket wire 21 is fixed to the outer peripheral surface of the distal end of the sheath 11, and the other end is fixed to the outer peripheral surface of the distal end of the operation wire 12.

The reference numeral 22 designates the basket wire 21 as the sheath 1.
It is a metal pipe for fixing to No. 1 and is fixed to the end portion of the basket wire 21 passed inside by brazing, for example, and is fixed to the outer peripheral surface of the sheath 11 by adhesion, for example. The tip of the operation wire 12 and the tip of the basket wire 21 are passed through one binding pipe 23, and are bound and fixed by brazing, for example.

In the gripping tool 10 constructed as described above, when the slider 15 is slid with respect to the operation portion main body 13 and the operation wire 12 is pulled toward the proximal end side, as shown in FIG. The tip of 12 is pulled toward the tip of the sheath 11.

As a result, the intermediate portions of the three basket wires 21 each loop outward, and as shown in FIG. 5 showing the V-V cross section, the operation wires 12 as a whole expand like a cage. The basket 20 is formed, and foreign matter can be captured therein.

If the slider 15 is moved in the opposite direction,
The bulge amount of the basket 20 becomes small, and the slider 15
Even if the hand is released, the bulge of the basket 20 returns to its original state and becomes small due to the elastic force of the basket wire 21.

If each basket wire 21 is provided with a gentle curve in advance so that each basket wire 21 loops correctly in a predetermined direction,
The basket 20 can be formed in a shape as planned.

FIG. 6 shows a foreign object (eg, bile duct stone) 100 in a body cavity obtained by passing the grasping tool 10 of the above embodiment through an endoscope.
Shows the procedure for capturing, and the numbers in the circles indicate the order.

When the endoscope 1 is guided to the position opposed to the foreign object 100, the grasping tool 10 is passed through the treatment instrument insertion channel of the endoscope 1 and the distal end portion of the grasping tool 10 is inserted as shown in FIG. It is projected from the endoscope 1.

Then, as shown in FIG.
The tip portion of is pushed further than the foreign object 100. Grasping tool 1
Since the tip portion of 0 is not swollen in the natural state, it can be easily pushed through the side of the foreign matter 100 and beyond.

Then, the operation wire 12 is pulled and
The basket 20 is inflated as shown in FIG.
When 0 is pulled toward the endoscope 1 side, the foreign matter 100 is captured in the basket 20 as indicated by.

FIG. 7 shows a second embodiment of the present invention, in which each of the basket wires 21 is preliminarily formed with a bent line. By doing so, as shown in FIG. 8 showing the state where the basket 20 is inflated, the basket 20 can be inflated according to a preset shape.

FIG. 9 shows a state in which the basket 20 according to the third embodiment of the present invention is inflated. The operation wire 12 is formed of a very flexible material such as nylon thread, and the basket wire is formed. 21 are arranged substantially evenly around the operation wire 12. In this embodiment, six basket wires 21 are arranged.

With this structure, after the foreign matter 100 is captured, the operation wire 12 is loosened to secure a large capacity of the basket 20 and the foreign matter 100 is captured, as shown in FIG. can do.

[0026]

According to the present invention, one end of a plurality of basket wires is fixed near the distal end of the sheath and the other end is fixed near the distal end of the operating wire so that the distal end of the operating wire approaches the distal end of the sheath. When the towing operation is performed, the basket wire inflates in a cage shape as a whole, so that the basket is forcibly inflated by the operation wire pulling operation, so that the basket is surely inflated into a cage shape to capture foreign matter with a high probability. be able to.

[Brief description of the drawings]

FIG. 1 is an overall configuration diagram of a basket-type grasping tool for an endoscope according to a first embodiment.

FIG. 2 is an enlarged side sectional view of a distal end portion of the basket type grasping tool for an endoscope according to the first embodiment.

FIG. 3 is a sectional view taken along line III-III of the basket type grasping tool for an endoscope according to the first embodiment.

FIG. 4 is an enlarged side sectional view of the basket-type grasping tool for an endoscope according to the first embodiment in a state where the basket is inflated.

FIG. 5 is a VV sectional view of the basket-type grasping tool for an endoscope according to the first embodiment.

FIG. 6 is a schematic view showing a usage state of the first embodiment.

FIG. 7 is an enlarged side sectional view of a distal end portion of the basket type grasping tool for an endoscope of the second embodiment.

FIG. 8 is an enlarged side sectional view of a distal end portion of the basket-type grasping tool for an endoscope according to the second embodiment in a state where the basket is inflated.

FIG. 9 is a side view of the distal end portion of the endoscope basket type grasping tool according to the third embodiment in a state where the basket is inflated.

FIG. 10 is a cross-sectional view taken along the line XX of FIG. 10 in which foreign matter is captured in the basket of the basket-type grasping tool for an endoscope according to the third embodiment.

[Explanation of symbols]

 11 sheath 12 operation wire 13 operation part main body 15 slider 21 basket wire

Claims (1)

[Claims] 1. An operating wire which is inserted into a sheath so as to be able to move forward and backward so that its distal end projects from the distal end of the sheath, operating means for operating the operating wire from the proximal side of the sheath, and one end of the operating wire. The sheath is fixed near the distal end and the other end is fixed near the distal end of the operating wire, and the operating wire is pulled by the operating means to bring the distal end of the operating wire close to the distal end of the sheath. A basket-type grasping tool for an endoscope, which is provided with a plurality of basket wires that swell like a basket.