JPH0919439A - 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: A basket type gripper for an endoscope comprising a control wire 12 extendably inserted in a sheath 11 and having its front end projected from the front end of the sheath 11, manipulating means 13, 15 for extending and retracting the control wire 12 from and into the proximal end of the sheath 11, and several flexible basket wires 12 having one end fixed to the sheath 11 in the vicinity of the front end of the latter, and the other end fixed to the control wire in the vicinity of the front end of the latter. The stiffness of the control wire 12 is set to be lager than that of the several basket wires 21, and accordingly, the basket wires 21 are bulged and shrunk when the control wire 12 is manipulated, without the control wire 12 bending.

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 bulge, and the inside of a highly viscous secretion or the like or a thin luminal 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, and a curving shape so as to form a cage as a whole, and one end is fixed near the distal end of the sheath and the other end is A plurality of flexible basket wires fixed near the distal end of the operation wire, the operation wire is stiffer than the plurality of basket wires, and by operating the operation wire forward and backward, The basket wire expands and contracts without breaking the operating wire.

[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 twisted wire obtained by twisting a large number of stainless steel fine wires is used as 1, and as shown in FIG. 3 showing a III-III cross section, for example, six wires are arranged so as to evenly surround the operation wire 12. . Note that both the operation wire 12 and the basket wire 21 may be single wires or non-metallic wires.

One end of each basket wire 21 is a sheath 1
1 is fixed to the outer peripheral surface of the tip, and the other end is fixed to the outer peripheral surface of the tip of the operation wire 12. Reference numeral 22 denotes a metal pipe for fixing the basket wire 21 to the sheath 11, which is fixed to the end of the basket wire 21 passed inside by brazing, for example, and fixed to the outer peripheral surface of the sheath 11 by adhesion, for example. Has been done. Operating wire 12
The leading end of the basket wire 21 and the leading end of the basket wire 21 are passed through one binding pipe 23, and are bound and fixed by brazing, for example.

Each of the six basket wires 21 is formed into a cage shape as a whole, and each of the six basket wires 21 is formed with a smooth curved curve. Therefore, in the natural state, as shown in FIGS. 1 to 3, the basket wire 21
Has a cage-like shape as a whole.

However, as the operation wire 12, a wire which is stiffer than the entire six basket wires 21 is used. Therefore, by operating the operation wire 12 forward and backward,
If the amount of protrusion of the operating wire 12 from the distal end of the sheath 11 is changed, the operating wire 12 will not buckle and the basket wire 21 will expand and contract.

In the gripping tool 10 thus constructed, in the natural state, the basket 20 formed by the six basket wires 21 is swelled like a cage,
Foreign matter can be captured in it.

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, the basket wire 21 can be further expanded and the operation wire 12 can be kept pulled. By holding it, the bulging state can be forcibly maintained. When the slider 15 is released, the basket 20 returns to its original, naturally inflated state.

When the slider 15 is moved in the opposite direction to push the tip of the operation wire 12 completely out of the tip of the sheath 11, as shown in FIGS.
2 is stronger than the whole basket wire 21, so
The basket wire 21 is stretched in a straight state without breaking the operation wire 12 and the basket 20 is deflated.

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 facing the foreign matter 100, the slider 15 is pushed in to extend the basket wire 21 in a straightened state as shown in, and the grasping tool 10 is viewed. The distal end portion of the gripping tool 10 is projected from the endoscope 1 by passing through the treatment tool insertion channel of the mirror 1.

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

Then, the operation wire 12 is pulled or the hand is removed from the slider 15 to inflate the basket 20 as shown in, and the entire grasping tool 10 is moved to the endoscope 1.
When pulled to the side, the foreign matter 100 is captured in the basket 20 as indicated by.

At this time, the basket wire 21 is placed in a highly viscous secretion in the body cavity or in a thin hollow organ.
Operation wires 1 even if they stick to each other or are pushed
By pulling 2 the basket 20 can be forcibly inflated and the foreign matter 100 can be reliably captured.

The present invention is not limited to the above embodiment, and the basket wire 21 may be any number, for example. Further, as shown in FIG. 7, the bending of the basket wire 21 depends on the basket wire 21.
May be bent.

[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 basket is forced by the pulling operation of the operating wire. Since it is inflated, the basket can be surely inflated like a basket and foreign objects can be captured with a high probability.

The operating wire is stiffer than the plurality of basket wires, and when the operating wire is moved back and forth, the operating wire is expanded and contracted without breaking the operating wire. It is possible to catch the foreign matter by pushing it out from the container to deflate the basket and pushing the basket to the front side of the foreign matter easily.

[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 in a natural state.

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 deflated.

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 a side view of a distal end portion of the basket-type grasping tool for an endoscope according to the second embodiment.

[Explanation of symbols]

 11 sheath 12 operation wire 13 operation part main body 15 slider 20 basket 21 basket wire 100 foreign matter

Claims (1)

[Claims] 1. An operating wire which is inserted into a sheath so as to be able to advance and retreat so that its distal end projects from the distal end of the sheath; operating means for operating the operating wire from the proximal end side of the sheath; And a plurality of flexible basket wires having one end fixed near the distal end of the sheath and the other end fixed near the distal end of the operating wire. The operation wire is stronger than the plurality of basket wires, and when the operation wire is moved back and forth, the operation wire is expanded and contracted without bending the operation wire. Grasping tool.