JP4105313B2 - Endoscopic basket-type collection tool - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an endoscope basket-type recovery tool that is inserted into and removed from a treatment tool insertion channel of an endoscope and used to recover foreign matter and the like from the body cavity.
[0002]
[Prior art]
In general, the basket-type collection tool for an endoscope is a basket in which an operation wire is inserted and disposed in a sheath that is inserted into and removed from a treatment instrument insertion channel of an endoscope so as to be movable back and forth in an axial direction, and is formed into a basket shape by an elastic wire. Is connected to the tip of the operation wire.
[0003]
Then, the operation wire connected to the proximal end of the sheath is operated to advance and retreat the operation wire in the axial direction, whereby the basket enters and exits the distal end of the sheath, and the basket swells in a basket shape by its own elasticity outside the sheath. It is designed to be constricted by being pulled in.
[0004]
[Problems to be solved by the invention]
When collecting a foreign substance from the body cavity, it is often the case that a plurality of foreign substances must be collected instead of only one. For example, in the case of multiple polyps, the polyps are first excised sequentially with a high-frequency snare, and then a plurality of polyps falling in the intestine are collected.
[0005]
In such a case, an endoscopic basket-type collecting tool is used. However, since collecting foreign substances one by one would require considerable effort and time, some foreign objects are in the basket. It is desirable to collect and collect them together.
[0006]
However, in order to capture the next foreign object in the center of the endoscope field of view after the foreign object is stored in the basket, the endoscope must be pushed and pulled or bent. In many cases, the pulling state of the operation wire is loosened and the foreign matter comes off the basket and falls.
[0007]
Further, when a relatively soft biological tissue or the like is collected as a foreign substance, if the pulling force of the operation wire for pulling the basket is too large, the collected tissue may be broken.
[0008]
Accordingly, the present invention can capture and collect a plurality of foreign matters in order so that the foreign matter accommodated in the basket does not come off while no operation is performed, and further, the foreign matter contained in the basket It is an object of the present invention to provide an endoscopic basket-type recovery tool that does not apply excessive force.
[0009]
[Means for Solving the Problems]
In order to achieve the above object, the endoscope basket-type recovery tool of the present invention has an operation wire inserted and disposed in a sheath that is inserted into and removed from the treatment instrument insertion channel of the endoscope so as to be capable of moving forward and backward in the axial direction. The basket formed in the shape of a basket with an elastic wire is connected to the distal end of the operation wire, and the operation wire is moved forward and backward in the axial direction at the operation portion connected to the proximal end of the sheath, whereby the basket is moved to the sheath. In the basket-type collection tool for an endoscope, the basket is swelled in and out of the sheath so that the basket expands in a basket shape by its own elasticity outside the sheath and is retracted into the sheath. The urging means for applying a traction force to the operation portion is provided in the operation portion, and the basket is lifted when the operation force is not applied to the operation portion. The operation wire in the direction drawn into the sheath, characterized in that it has to be towed.
[0010]
Note that a traction force may be applied to the operation wire from the biasing means until the intermediate portion of the basket is pulled into the sheath, or the basket is completely within the sheath. You may make it a traction force be provided with respect to the said operation wire from the said urging | biasing means to the position pulled in.
[0011]
The urging means may be a compression coil spring, and the operation portion may be detachable from the sheath together with the operation wire and the basket.
[0012]
DETAILED DESCRIPTION OF THE INVENTION
FIG. 1 shows a basket-type recovery tool for an endoscope according to a first reference example of the present invention. A flexible sheath 1 inserted into and removed from a treatment instrument insertion channel of an endoscope is formed by tetrafluoride. It is formed of an ethylene resin tube or the like.
[0013]
An operation wire 2 is inserted and disposed in the sheath 1 so as to be movable back and forth in the axial direction. For example, a basket 3 formed in a basket shape by four elastic wires is connected to the distal end of the operation wire 2. 4 is a connecting pipe, and 5 is a tip for binding the tip of the basket 3.
[0014]
As a result, when the operation wire 2 is moved back and forth in the axial direction from the hand side, the basket 3 enters and exits the distal end of the sheath 1, and the basket 3 swells in a cage shape by its own elasticity outside the sheath 1. Squeezed by being drawn into.
[0015]
An operation portion 10 for operating the operation wire 2 to advance and retract is connected to the proximal end portion of the sheath 1. 11 is an operation part main body formed in a cylindrical shape, and the base end of the sheath 1 is bonded and fixed.
[0016]
The drive rod 12 connected to the proximal end of the operation wire 2 protrudes from the operation unit body 11 to the hand side, and a push button 13 is attached to the hand side end portion. In addition, a disk-like finger pad 14 disposed so that the drive rod 12 penetrates is detachably engaged with the proximal end portion of the operation unit main body 11 by helical coupling.
[0017]
A compression coil spring 15 (biasing means) is sandwiched between the push button 13 and the finger pad 14 in a compressed state, and urges the driving rod 12 in a direction to pull it out from the operation portion main body 11. ing.
[0018]
However, as shown in FIG. 1, when the stepped portion 16 formed in the middle of the drive rod 12 comes into contact with the finger pad 14, it becomes a stopper and the drive rod 12 cannot be pulled out any further. At that time, the basket 3 is completely stored in the sheath 1.
[0019]
As shown in FIG. 2, the basket-type collection tool for an endoscope configured as described above pushes the push button 13 against the urging force of the compression coil spring 15, so that the basket 3 becomes the tip of the sheath 1. When the operation of pushing the sheath 1 is stopped, the operation wire is moved to a position where the basket 3 is accommodated in the sheath 1 by the urging force of the compression coil spring 15. 2 is towed.
[0020]
During the preparation for capturing the next foreign object after capturing the foreign object in the basket 3, the sheath 1 is passed through the treatment instrument insertion channel 51 of the endoscope 50 as shown in FIG. The guidance operation of the endoscope 50 is performed while the foreign object 100 is captured.
[0021]
Accordingly, no operation is performed on the operation unit 10, but the operation wire 2 is pulled toward the hand side by the drive rod 12, so that the basket 3 in which the foreign object 100 is captured is closed. It is tightened.
[0022]
Therefore, the foreign object 100 does not fall out of the basket 3 while the endoscope 50 is being guided, and a plurality of foreign objects 100 can be captured in the basket 3 one after another.
[0023]
After use, the operation wire 2 and the basket 3 can be pulled out from the sheath 1 by releasing the engagement between the operation portion main body 11 and the finger pad 14, and each can be cleaned and disinfected. The proximal end of the operation unit main body 11 is formed in a tapered shape that is convenient for connecting a syringe containing a cleaning liquid or the like.
[0024]
4 and 5 show a basket type recovery tool for an endoscope according to a second reference example of the present invention. FIG. 4 shows a state in which the basket 3 is inflated, and FIG. 5 shows that the basket 3 is a sheath. 1 shows a state of being housed in 1 and being constricted. In FIG. 5, only the tip portion is shown enlarged.
[0025]
In this reference example , the tip 5 for binding the tip of the basket 3 is formed to a thickness that does not lead into the sheath 1. Therefore, when no operating force is applied, the rear end of the distal tip 5 is in contact with the distal end of the sheath 1 as shown in FIG.
[0026]
Further, the operation unit 20 has a wire drive that slides within a slit 23 formed in the operation unit main body 21 in which an annular first finger hook is formed at the proximal end of the operation unit main body 21 to which the sheath 1 is connected A second finger hook 25 composed of a pair of annular portions is formed at both ends of the piece 24.
[0027]
The proximal end of the operation wire 2 is connected to a wire drive piece 24 and is always urged toward the proximal side by a compression coil spring 26 disposed in the slot 23. Thus, in the present invention, the operation unit can take various shapes.
[0028]
6 and FIG. 7 shows an endoscopic basket recovery tool implementation of the present invention, FIG. 6, no external force is applied in a state where foreign matter 100 is accommodated in the basket 3 FIG. 7 shows a state where the operator applies an operating force to pull the operation wire 2 and the basket 3 is completely stored in the sheath 1.
[0029]
In this embodiment, as shown in FIG. 6, the traction force acts on the operation wire 2 from the compression coil spring 26 only to the position where the intermediate portion of the basket 3 is accommodated in the sheath 1.
[0030]
Therefore, excessive tightening force is not applied from the basket 3 to the foreign material 100 accommodated in the basket 3, and it is possible to prevent the foreign material 100 from being broken even if it is soft.
[0031]
【The invention's effect】
According to the present invention, the urging means for applying a traction force to the operation wire is provided in the operation portion, and when the operation force is not applied to the operation portion, the operation wire is pulled in the direction in which the basket is drawn into the sheath. Since the basket is tightened in the closing direction when no operation is performed, multiple foreign objects can be captured and recovered in order without dropping the foreign objects contained in the basket. Can do.
[0032]
Further, if traction force is applied from the biasing means to the operation wire to a position where the intermediate portion of the basket is pulled into the sheath, excessive force is applied from the basket to the foreign matter contained in the basket. In addition, soft foreign matters can be prevented from being broken.
[Brief description of the drawings]
FIG. 1 is a side cross-sectional view showing a state where an operation wire of a basket-type collection tool for an endoscope according to a first reference example of the present invention is pulled.
[2] The first state in which the operation wire is pushed out of the endoscopic basket collection device of the reference example of the present invention part is a side view showing in cross-section.
FIG. 3 is a side view showing a partial cross-sectional view of the state of use of the basket-type collection tool for an endoscope according to the first reference example of the present invention.
FIG. 4 is a side view, partly in cross section, showing a state in which an operation wire of a basket-type collection tool for an endoscope according to a second reference example of the present invention is pushed out.
FIG. 5 is a side cross-sectional view showing a state in which an operation wire of a basket-type collection tool for an endoscope according to a second reference example of the present invention is pulled.
6 is a side view of the operation wire of the endoscope basket recovery tool implementation forms of illustrates in partial cross section a state of being towed to an intermediate of the present invention.
7 is a side view showing a state where the operation wire is completely traction endoscopic basket recovery tool implementation form in partial section of the present invention.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Sheath 2 Operation wire 3 Basket 10,20 Operation part 15,26 Compression coil spring

Claims (4)

An operation wire is inserted and arranged in a sheath inserted into and removed from the treatment instrument insertion channel of the endoscope so as to be movable forward and backward in the axial direction, and a basket formed in a basket shape by an elastic wire is connected to the tip of the operation wire, The basket is moved into and out of the distal end of the sheath by moving the operation wire forward and backward in the axial direction at the operation portion connected to the proximal end of the sheath, and the basket is caged by its own elasticity outside the sheath. In the basket-type collection tool for an endoscope, which is swelled by being pulled into the sheath, and then narrowed.
And biasing means are provided on the operation unit for applying a traction force to the operation wire, the basket with respect to the operation wire from said biasing means to an intermediate portion of the basket is drawn within the sheath traction write non-oriented drawn into the sheath is applied, in the state in which the basket is drawn into the sheath until the portion of the tip closer than the intermediate portion, so that the traction force to the operation wire from said biasing means does not act A basket-type collection tool for an endoscope, characterized by being made. Endoscopic basket recovery device according to claim 1 Symbol mounting said biasing means is a compression coil spring. A wire drive piece to which the base end of the operation wire is connected is slidably provided in the operation portion, and the compression coil spring is compressed until the intermediate portion of the basket is pulled into the sheath. In this state, the compression coil spring is fully extended and the wire drive piece is separated from the compression coil spring. The basket-type collection tool for an endoscope according to claim 2, which is in a stagnation state . The basket-type collection tool for an endoscope according to claim 1, 2 or 3 , wherein the operation section is detachable from the sheath together with the operation wire and the basket.

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